TROJ_CRYPWALL.YNU

July 18, 2014

ALIASES:

Ransom:Win32/Crowti (Microsoft); RDN/Generic.tfr!ea (McAfee); Trojan.Cryptodefense (Symantec); Trojan-Ransom.Win32.Cryptodef.pd (Kaspersky); Troj/Agent-AHQI (Sophos); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan horse Generic36.VSH (AVG)

PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

TECHNICAL DETAILS

File Size: 310,272 bytes

File Type: EXE

Memory Resident: Yes

Initial Samples Received Date: 15 Jul 2014

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
c060e3 = "%System Root%\c060e33\c060e33.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
c060e33 = "%User Profile%\Application Data\c060e33.exe"

Other System Modifications

This Trojan modifies the following file(s):

%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD
%User Profile%\Templates\excel.xls
%User Profile%\Templates\excel4.xls
%User Profile%\Templates\powerpnt.ppt
%User Profile%\Templates\quattro.wb2
%User Profile%\Templates\sndrec.wav
%User Profile%\Templates\winword.doc
%User Profile%\Templates\winword2.doc
%User Profile%\Templates\wordpfct.wpd

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It deletes the following files:

%System Root%\c060e33

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry keys:

HKEY_CURRENT_USER\software\C060E3394263A6C1DA62A9485454C1E5

HKEY_CURRENT_USER\software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE

It adds the following registry entries:

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
0a = "{random values}"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
6b = "{random characters}"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
0c = "{random characters}"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
ed = "{random characters}"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Internet Explorer\brndlog.bak = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Internet Explorer\brndlog.txt = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\excel.xls = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\excel4.xls = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\powerpnt.ppt = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\quattro.wb2 = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\sndrec.wav = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\winword.doc = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\winword2.doc = "68adfd"

HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\
12444555689AACDE
%User Profile%\Templates\wordpfct.wpd = "68adfd"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "1"

Dropping Routine

This Trojan drops the following files:

%System Root%\c060e33\c060e33.exe
%User Profile%\Application Data\c060e33.exe
%User Startup%\c060e33.exe
A:\DECRYPT_INSTRUCTION.TXT
A:\DECRYPT_INSTRUCTION.HTML
A:\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.qq8
%User Profile%\Internet Explorer\brndlog.bak
%User Profile%\Internet Explorer\brndlog.txt.6ji
%User Profile%\Internet Explorer\brndlog.txt
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.TXT
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.HTML
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.URL
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.TXT
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.HTML
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.URL
%User Profile%\Application Data\DECRYPT_INSTRUCTION.TXT
%User Profile%\Application Data\DECRYPT_INSTRUCTION.HTML
%User Profile%\Application Data\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.3c2
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.URL
%Application Data%\DECRYPT_INSTRUCTION.TXT
%Application Data%\DECRYPT_INSTRUCTION.HTML
%Application Data%\DECRYPT_INSTRUCTION.URL
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.TXT
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.HTML
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.URL
%User Profile%\Templates\excel.xls.6g2
%User Profile%\Templates\excel4.xls.i5t
%User Profile%\Templates\powerpnt.ppt.4mp
%User Profile%\Templates\quattro.wb2.uv8
%User Profile%\Templates\sndrec.wav.5mo
%User Profile%\Templates\winword.doc.7km
%User Profile%\Templates\winword2.doc.r3g
%User Profile%\Templates\wordpfct.wpd.9qu
%User Profile%\Templates\DECRYPT_INSTRUCTION.TXT
%User Profile%\Templates\DECRYPT_INSTRUCTION.HTML
%User Profile%\Templates\DECRYPT_INSTRUCTION.URL
%User Profile%\DECRYPT_INSTRUCTION.TXT
%User Profile%\DECRYPT_INSTRUCTION.HTML
%User Profile%\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.72u
%User Profile%\Internet Explorer\brndlog.txt.7vu
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.5d6
%User Profile%\Templates\excel.xls.y1c
%User Profile%\Templates\excel4.xls.eh0
%User Profile%\Templates\powerpnt.ppt.qp9
%User Profile%\Templates\quattro.wb2.5j7
%User Profile%\Templates\sndrec.wav.nn4
%User Profile%\Templates\winword.doc.6r3
%User Profile%\Templates\winword2.doc.hr8
%User Profile%\Templates\wordpfct.wpd.y9d
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.TXT
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.HTML
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.URL
%System Root%\DECRYPT_INSTRUCTION.TXT
%System Root%\DECRYPT_INSTRUCTION.HTML
%System Root%\DECRYPT_INSTRUCTION.URL
%Desktop%\DECRYPT_INSTRUCTION.TXT
%Desktop%\DECRYPT_INSTRUCTION.HTML
%Desktop%\DECRYPT_INSTRUCTION.URL
%User Startup%\DECRYPT_INSTRUCTION.TXT
%User Startup%\DECRYPT_INSTRUCTION.HTML
%User Startup%\DECRYPT_INSTRUCTION.URL

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

http://{BLOCKED}aultppc.com
{BLOCKED}.101.96
{BLOCKED}8.124.30
{BLOCKED}.44.5
{BLOCKED}0.1
{BLOCKED}.77.26

It deletes itself after execution.

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine: 9.700

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

In HKEY_CURRENT_USER\software
- C060E3394263A6C1DA62A9485454C1E5

In HKEY_CURRENT_USER\software\C060E3394263A6C1DA62A9485454C1E5
- 12444555689AACDE

Step 4

Delete this registry value

[ Learn More ]

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- c060e3 = "%System Root%\c060e33\c060e33.exe"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- c060e33 = "%User Profile%\Application Data\c060e33.exe"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
- 0a = "{random values}"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
- 6b = "{random characters}"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
- 0c = "{random characters}"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5
- ed = "{random characters}"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Internet Explorer\brndlog.bak = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Internet Explorer\brndlog.txt = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\excel.xls = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\excel4.xls = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\powerpnt.ppt = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\quattro.wb2 = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\sndrec.wav = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\winword.doc = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\winword2.doc = "68adfd"

In HKEY_CURRENT_USER\Software\C060E3394263A6C1DA62A9485454C1E5\12444555689AACDE
- %User Profile%\Templates\wordpfct.wpd = "68adfd"

To delete the registry value this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
In the right panel, locate and delete the entry:
c060e3 = "%System Root%\c060e33\c060e33.exe"
Again In the right panel, locate and delete the entry:
c060e33 = "%User Profile%\Application Data\c060e33.exe"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>C060E3394263A6C1DA62A9485454C1E5
In the right panel, locate and delete the entry:
0a = "{random values}"
Again In the right panel, locate and delete the entry:
6b = "{random characters}"
Again In the right panel, locate and delete the entry:
0c = "{random characters}"
Again In the right panel, locate and delete the entry:
ed = "{random characters}"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>C060E3394263A6C1DA62A9485454C1E5>12444555689AACDE
In the right panel, locate and delete the entry:
%User Profile%\Internet Explorer\brndlog.bak = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Internet Explorer\brndlog.txt = "68adfd"
Again In the right panel, locate and delete the entry:
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\excel.xls = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\excel4.xls = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\powerpnt.ppt = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\quattro.wb2 = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\sndrec.wav = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\winword.doc = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\winword2.doc = "68adfd"
Again In the right panel, locate and delete the entry:
%User Profile%\Templates\wordpfct.wpd = "68adfd"
Close Registry Editor.

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
- DisableSR = "1"

Step 6

Search and delete these components

[ Learn More ]

There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%System Root%\c060e33\c060e33.exe
%User Profile%\Application Data\c060e33.exe
%User Startup%\c060e33.exe
A:\DECRYPT_INSTRUCTION.TXT
A:\DECRYPT_INSTRUCTION.HTML
A:\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.qq8
%User Profile%\Internet Explorer\brndlog.bak
%User Profile%\Internet Explorer\brndlog.txt.6ji
%User Profile%\Internet Explorer\brndlog.txt
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.TXT
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.HTML
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.URL
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.TXT
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.HTML
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.URL
%User Profile%\Application Data\DECRYPT_INSTRUCTION.TXT
%User Profile%\Application Data\DECRYPT_INSTRUCTION.HTML
%User Profile%\Application Data\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.3c2
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.URL
%Application Data%\DECRYPT_INSTRUCTION.TXT
%Application Data%\DECRYPT_INSTRUCTION.HTML
%Application Data%\DECRYPT_INSTRUCTION.URL
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.TXT
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.HTML
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.URL
%User Profile%\Templates\excel.xls.6g2
%User Profile%\Templates\excel4.xls.i5t
%User Profile%\Templates\powerpnt.ppt.4mp
%User Profile%\Templates\quattro.wb2.uv8
%User Profile%\Templates\sndrec.wav.5mo
%User Profile%\Templates\winword.doc.7km
%User Profile%\Templates\winword2.doc.r3g
%User Profile%\Templates\wordpfct.wpd.9qu
%User Profile%\Templates\DECRYPT_INSTRUCTION.TXT
%User Profile%\Templates\DECRYPT_INSTRUCTION.HTML
%User Profile%\Templates\DECRYPT_INSTRUCTION.URL
%User Profile%\DECRYPT_INSTRUCTION.TXT
%User Profile%\DECRYPT_INSTRUCTION.HTML
%User Profile%\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.72u
%User Profile%\Internet Explorer\brndlog.txt.7vu
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.5d6
%User Profile%\Templates\excel.xls.y1c
%User Profile%\Templates\excel4.xls.eh0
%User Profile%\Templates\powerpnt.ppt.qp9
%User Profile%\Templates\quattro.wb2.5j7
%User Profile%\Templates\sndrec.wav.nn4
%User Profile%\Templates\winword.doc.6r3
%User Profile%\Templates\winword2.doc.hr8
%User Profile%\Templates\wordpfct.wpd.y9d
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.TXT
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.HTML
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.URL
%System Root%\DECRYPT_INSTRUCTION.TXT
%System Root%\DECRYPT_INSTRUCTION.HTML
%System Root%\DECRYPT_INSTRUCTION.URL
%Desktop%\DECRYPT_INSTRUCTION.TXT
%Desktop%\DECRYPT_INSTRUCTION.HTML
%Desktop%\DECRYPT_INSTRUCTION.URL
%User Startup%\DECRYPT_INSTRUCTION.TXT
%User Startup%\DECRYPT_INSTRUCTION.HTML
%User Startup%\DECRYPT_INSTRUCTION.URL

To manually delete a malware/grayware component from an affected system:

• For Windows 2000, Windows XP, and Windows Server 2003:

Right-click Start then click Search....
In the Named input box, type:
%System Root%\c060e33\c060e33.exe
%User Profile%\Application Data\c060e33.exe
%User Startup%\c060e33.exe
A:\DECRYPT_INSTRUCTION.TXT
A:\DECRYPT_INSTRUCTION.HTML
A:\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.qq8
%User Profile%\Internet Explorer\brndlog.bak
%User Profile%\Internet Explorer\brndlog.txt.6ji
%User Profile%\Internet Explorer\brndlog.txt
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.TXT
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.HTML
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.URL
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.TXT
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.HTML
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.URL
%User Profile%\Application Data\DECRYPT_INSTRUCTION.TXT
%User Profile%\Application Data\DECRYPT_INSTRUCTION.HTML
%User Profile%\Application Data\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.3c2
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.URL
%Application Data%\DECRYPT_INSTRUCTION.TXT
%Application Data%\DECRYPT_INSTRUCTION.HTML
%Application Data%\DECRYPT_INSTRUCTION.URL
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.TXT
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.HTML
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.URL
%User Profile%\Templates\excel.xls.6g2
%User Profile%\Templates\excel4.xls.i5t
%User Profile%\Templates\powerpnt.ppt.4mp
%User Profile%\Templates\quattro.wb2.uv8
%User Profile%\Templates\sndrec.wav.5mo
%User Profile%\Templates\winword.doc.7km
%User Profile%\Templates\winword2.doc.r3g
%User Profile%\Templates\wordpfct.wpd.9qu
%User Profile%\Templates\DECRYPT_INSTRUCTION.TXT
%User Profile%\Templates\DECRYPT_INSTRUCTION.HTML
%User Profile%\Templates\DECRYPT_INSTRUCTION.URL
%User Profile%\DECRYPT_INSTRUCTION.TXT
%User Profile%\DECRYPT_INSTRUCTION.HTML
%User Profile%\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.72u
%User Profile%\Internet Explorer\brndlog.txt.7vu
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.5d6
%User Profile%\Templates\excel.xls.y1c
%User Profile%\Templates\excel4.xls.eh0
%User Profile%\Templates\powerpnt.ppt.qp9
%User Profile%\Templates\quattro.wb2.5j7
%User Profile%\Templates\sndrec.wav.nn4
%User Profile%\Templates\winword.doc.6r3
%User Profile%\Templates\winword2.doc.hr8
%User Profile%\Templates\wordpfct.wpd.y9d
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.TXT
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.HTML
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.URL
%System Root%\DECRYPT_INSTRUCTION.TXT
%System Root%\DECRYPT_INSTRUCTION.HTML
%System Root%\DECRYPT_INSTRUCTION.URL
%Desktop%\DECRYPT_INSTRUCTION.TXT
%Desktop%\DECRYPT_INSTRUCTION.HTML
%Desktop%\DECRYPT_INSTRUCTION.URL
%User Startup%\DECRYPT_INSTRUCTION.TXT
%User Startup%\DECRYPT_INSTRUCTION.HTML
%User Startup%\DECRYPT_INSTRUCTION.URL
In the Look In drop-down list, select My Computer then press Enter.
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.

• For Windows Vista and Windows 7 users:

Click Start>Computer.
In the Search input box, type:
%System Root%\c060e33\c060e33.exe
%User Profile%\Application Data\c060e33.exe
%User Startup%\c060e33.exe
A:\DECRYPT_INSTRUCTION.TXT
A:\DECRYPT_INSTRUCTION.HTML
A:\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.qq8
%User Profile%\Internet Explorer\brndlog.bak
%User Profile%\Internet Explorer\brndlog.txt.6ji
%User Profile%\Internet Explorer\brndlog.txt
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.TXT
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.HTML
%User Profile%\Internet Explorer\DECRYPT_INSTRUCTION.URL
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.TXT
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.HTML
%User Profile%\Microsoft\DECRYPT_INSTRUCTION.URL
%User Profile%\Application Data\DECRYPT_INSTRUCTION.TXT
%User Profile%\Application Data\DECRYPT_INSTRUCTION.HTML
%User Profile%\Application Data\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.3c2
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\9.0\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\Windows Media\DECRYPT_INSTRUCTION.URL
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.TXT
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.HTML
%Application Data%\Microsoft\DECRYPT_INSTRUCTION.URL
%Application Data%\DECRYPT_INSTRUCTION.TXT
%Application Data%\DECRYPT_INSTRUCTION.HTML
%Application Data%\DECRYPT_INSTRUCTION.URL
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.TXT
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.HTML
%User Profile%\Local Settings\DECRYPT_INSTRUCTION.URL
%User Profile%\Templates\excel.xls.6g2
%User Profile%\Templates\excel4.xls.i5t
%User Profile%\Templates\powerpnt.ppt.4mp
%User Profile%\Templates\quattro.wb2.uv8
%User Profile%\Templates\sndrec.wav.5mo
%User Profile%\Templates\winword.doc.7km
%User Profile%\Templates\winword2.doc.r3g
%User Profile%\Templates\wordpfct.wpd.9qu
%User Profile%\Templates\DECRYPT_INSTRUCTION.TXT
%User Profile%\Templates\DECRYPT_INSTRUCTION.HTML
%User Profile%\Templates\DECRYPT_INSTRUCTION.URL
%User Profile%\DECRYPT_INSTRUCTION.TXT
%User Profile%\DECRYPT_INSTRUCTION.HTML
%User Profile%\DECRYPT_INSTRUCTION.URL
%User Profile%\Internet Explorer\brndlog.bak.72u
%User Profile%\Internet Explorer\brndlog.txt.7vu
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD.5d6
%User Profile%\Templates\excel.xls.y1c
%User Profile%\Templates\excel4.xls.eh0
%User Profile%\Templates\powerpnt.ppt.qp9
%User Profile%\Templates\quattro.wb2.5j7
%User Profile%\Templates\sndrec.wav.nn4
%User Profile%\Templates\winword.doc.6r3
%User Profile%\Templates\winword2.doc.hr8
%User Profile%\Templates\wordpfct.wpd.y9d
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.TXT
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.HTML
%System Root%\Documents and Settings\DECRYPT_INSTRUCTION.URL
%System Root%\DECRYPT_INSTRUCTION.TXT
%System Root%\DECRYPT_INSTRUCTION.HTML
%System Root%\DECRYPT_INSTRUCTION.URL
%Desktop%\DECRYPT_INSTRUCTION.TXT
%Desktop%\DECRYPT_INSTRUCTION.HTML
%Desktop%\DECRYPT_INSTRUCTION.URL
%User Startup%\DECRYPT_INSTRUCTION.TXT
%User Startup%\DECRYPT_INSTRUCTION.HTML
%User Startup%\DECRYPT_INSTRUCTION.URL
Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CRYPWALL.YNU. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 8

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD
%User Profile%\Templates\excel.xls
%User Profile%\Templates\excel4.xls
%User Profile%\Templates\powerpnt.ppt
%User Profile%\Templates\quattro.wb2
%User Profile%\Templates\sndrec.wav
%User Profile%\Templates\winword.doc
%User Profile%\Templates\winword2.doc
%User Profile%\Templates\wordpfct.wpd

Step 9

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

%System Root%\c060e33

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