TROJ_CRYPWALL.YY
Crypt3.BZHO(AVG);Trojan-Ransom.Win32.Blocker.gmug(Kaspersky);VirTool:Win32/CeeInject.gen!KK(Microsoft)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan deletes the initially executed copy of itself.
TECHNICAL DETAILS
225,341 bytes
EXE
Yes
07 Feb 2015
Installation
This Trojan drops the following copies of itself into the affected system:
- %System Root%\(8 random characters)\{8 random characters}.exe
- %Application Data%\(8 random characters).exe
- %User Startup%\(8 random characters).exe
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %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.)
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
{8 random characters} = "%System Root%\(8 random characters)\{8 random characters}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{8 random characters}c = "%Application Data%\{8 random characters}.exe"
It drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\(8 random characters).exe
(Note: %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.)
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BITS
Start = 4
(Note: The default value data of the said registry entry is 3.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ERSvc
Start = 4
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
Start = 4
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv
Start = 4
(Note: The default value data of the said registry entry is 2.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}s.com/img4.php
- {BLOCKED}flymedia.az/img2.php
- {BLOCKED}rniainsuranceco.com/img4.php
- {BLOCKED}seniordogfood.com/img2.php
- {BLOCKED}nblowdri.com/img4.php
- {BLOCKED}lassn.com/volunteer/img1.php
- {BLOCKED}.net/plus/img1.php
- {BLOCKED}voplasma.com/televisa/img1.php
- {BLOCKED}-score-repair-help.com/img4.php
- {BLOCKED}rack.com/img2.php
- {BLOCKED}ctor.com/img3.php
- {BLOCKED}members.com/img4.php
- {BLOCKED}ondock.com/img2.php
- {BLOCKED}utions.net/img5.php
- {BLOCKED}chluy.net/utf.php
- {BLOCKED}shersreviews.org/img3.php
- {BLOCKED}olve.com/img2.php
- {BLOCKED}igninc.net/img3.php
- {BLOCKED}ligames.org/img1.php
- {BLOCKED}ithere.com/tools/img2.php
- {BLOCKED}wncarandlimousine.com/img1.php
- {BLOCKED}eaparchitects.com/img4.php
- {BLOCKED}ashlaundry.com/wp-content/img1.php
- {BLOCKED}lawoffice.com/img1.php
- {BLOCKED}ski.com/img5.php
- {BLOCKED}ideosonline.net/img2.php
- {BLOCKED}.com/img3.php
- {BLOCKED}apan.com/img3.php
- {BLOCKED}sm.net/img4.php
- {BLOCKED}bo.org/img5.php
- {BLOCKED}up.net/img5.php
- {BLOCKED}ns.com/img4.php
- {BLOCKED}olistic.com/img1.php
- {BLOCKED}f.com/img4.php
- {BLOCKED}ngela.com/img5.php
- {BLOCKED}-club.net/img3.php
- {BLOCKED}ldakariri.net/img2.php
- {BLOCKED}rt.net/img2.php
- {BLOCKED}alestateinvestor.com/img1.php
- {BLOCKED}com/img5.php
- {BLOCKED}usmetalsrarecoininvestments.com/img2.php
- {BLOCKED}a.com/img1.php
- {BLOCKED}orseoservices.com.au/img5.php
It deletes the initially executed copy of itself
NOTES:
This Trojan drops the following files in the folder where encrypted files are:
- HELP_DECRYPT.TXT
- HELP_DECRYPT.HTML
- HELP_DECRYPT.URL
- HELP_DECRYPT.PNG