Ransom_PCLOCK.A
W32/Filecoder.NFZ!tr (Fortinet); Trojan-Ransom.Win32.Snocry.bln (Kaspersky); Ransom:Win32/Genasom!rfn (Microsoft)
Windows

Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 connects to certain websites to send and receive information.
TECHNICAL DETAILS
294,913 bytes
EXE
Yes
14 Nov 2016
Encrypts files, Renames files, Drops files,
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.
Installation
This Trojan drops the following files:
- %User Profile%\cl_data_{BTC wallet identifier}.bak
- %Application Data%\Microsoft\Crypto\en_files.txt - list of encrypted files
- %Application Data%\Microsoft\Crypto\wp.jpg - Ransom Note, image used as wallpaper
- %Desktop%\CryptoLocker.lnk - Shortcut pointing to dropped copy
(Note: %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.. %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.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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.)
It drops the following copies of itself into the affected system:
- %Application Data%\Microsoft\Crypto\sysras.exe
(Note: %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.)
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
2e7a6119 = "%Application Data%\Microsoft\Crypto\sysras.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
2e7a6119\{random}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
2e7a6119\{random}
{random} = "{BTC wallet identifier}"
Other Details
This Trojan connects to the following website to send and receive information:
- http://{BLOCKED}oadchapel.org/
- http://www.{BLOCKED}ncapital.io/
- http://www.{BLOCKED}k.com/
- http://www.{BLOCKED}dprivateeyes.com/
- http://www.{BLOCKED}ercadoramirez.es/
- http://{BLOCKED}hain.info/q/getreceivedbyaddress/{BTC wallet identifier}?confirmations=0
It encrypts files with the following extensions:
- .73b
- .787
- .7z
- .7z.001
- .7z.002
- .8cm
- .8pbs
- .8svx
- .8xi
- .9.png
- ._eml
- .a00
- .a01
- .a02
- .a2c
- .a2m
- .a3w
- .a4m
- .a4p
- .a4w
- .a52
- .a5rpt
- .a5w
- .a65
- .aa
- .aa3
- .aac
- .aam
- .aao
- .aax
- .ab3
- .abcd
- .abdata
- .abf
- .abk
- .abm
- .abw
- .abx
- .aby
- .ac3
- .ac5
- .ac6
- .accdb
- .accde
- .accdr
- .acd-zip
- .ace
- .acm
- .acp
- .acr
- .act
- .adc
- .adcp
- .ade
- .adf
- .adp
- .adts
- .adz
- .aep
- .aepx
- .aes
- .aet
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- .af2
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- .doc
- .docm
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- .docxml
- .docz
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- .e01
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- .kyr
- .kz
- .layout
- .lbm
- .lbr
- .lcb
- .lcd
- .lcn
- .ldr
- .legal
- .lha
- .lhs
- .lid
- .lisp
- .lit
- .ljp
- .llx
- .lnt
- .lnx
- .lp
- .lp2
- .lp7
- .lpdb
- .lpp
- .lqr
- .lqt
- .lrc
- .lrec
- .lrs
- .lrv
- .lsp
- .lsproj
- .ltr
- .luf
- .lut
- .lutx
- .lvp
- .lvw
- .lw4
- .lwd
- .lwo
- .lwp
- .lws
- .lxf
- .lxo
- .lxsproj
- .lyc
- .lyx
- .lz
It does the following:
- It deletes shadow copies by executing the following command:
- vssadmin Delete Shadows /All /Quiet
- It prevents encrypting files containing any of the strings in its full path name:
- \AppData
- \Application Data
- \Boot
- \ESTsoft
- \Local Settings
- \PerfLogs
- \ProgramData
- \Program Files
- \Temporary
- \AMD\
- \Dell\
- \HP\
- \Intel\
- \McAfee\
- \Norton\
- \Norton Installer
- \Chrome
- Drivers
- Microsoft
- Sample Music
- Sample Pictures
- Setupli>Windows ®
- Games
- HeroOnline
- iTunes
- FIFA
- League
- MineCraft
- nDoors
- SmileGate
- Steam
- TwelveSky
- WarRock
- It drops ransom notes to all physical and removal drives except root drive.
- {drive letter}:\Your files are locked !!!!!.txt
- {drive letter}:\Your files are locked !!!!.txt
- {drive letter}:\Your files are locked !!!.txt
- {drive letter}:\Your files are locked !!.txt
- {drive letter}:\Your files are locked !.txt
NOTES:
This ransomware changes the wallpaper with the following image:
It also displays the following ransom note:
SOLUTION
9.800
12.898.08
14 Nov 2016
12.899.00
15 Nov 2016
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry key
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
- VB and VBA Program Settings
- VB and VBA Program Settings
Step 5
Delete this registry value
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\Microsoft\Windows\CurrentVersion\Run
- 2e7a6119 = "%Application Data%\Microsoft\Crypto\sysras.exe"
- 2e7a6119 = "%Application Data%\Microsoft\Crypto\sysras.exe"
Step 6
Search and delete this file
- {drive letter}:\Your files are locked !!!!!.txt
- {drive letter}:\Your files are locked !!!!.txt
- {drive letter}:\Your files are locked !!!.txt
- {drive letter}:\Your files are locked !!.txt
- {drive letter}:\Your files are locked !.txt
- %User Profile%\cl_data_{BTC wallet identifier}.bak
- %Application Data%\Microsoft\Crypto\en_files.txt
- %Application Data%\Microsoft\Crypto\wp.jpg
- %Desktop%\CryptoLocker.lnk
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom_PCLOCK.A. 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.
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