RANSOM_CRYPGPCODE.THJ
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 deletes the initially executed copy of itself.
TECHNICAL DETAILS
559,755 bytes
EXE
Yes
16 Feb 2016
Displays message/message boxes
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 copies of itself into the affected system and executes them:
- %Application Data%\{random folder name}\{random filename}.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.)
It drops the following files:
- %User Temp%\pid.txt - contains process ID of the running malware
- %User Temp%\bind.exe - program used to prevent system logoff, standy and shutdown
- %User Temp%\bind.ini - configuration of bind.exe
- %User Temp%\lol.bin
- %Desktop%\how to get data.txt - ransom note
- {Folder of encrypted files}\how to get data.txt - ransom note
- {malware path}\works_fine.bat - used to delete initial copy
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 adds the following processes:
- taskmgr.exe
- bind.exe
Autostart Technique
This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\Windows.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other Details
This Trojan encrypts files with the following extensions:
- *.1cd
- *.3fr
- *.3gp
- *.7z
- *.?ar
- *.abk
- *.accdb
- *.adf
- *.ai
- *.arc
- *.arj
- *.arw
- *.ashbak
- *.ashdisk
- *.avi
- *.ba?
- *.backup
- *.bk?
- *.bmp
- *.bup
- *.cdr
- *.cdx
- *.cer
- *.cf
- *.cfu
- *.cr?
- *.cs?
- *.da?
- *.dbf
- *.dcr
- *.der
- *.dic
- *.divx
- *.djvu
- *.dng
- *.doc
- *.doc?
- *.dt
- *.dwg
- *.dx?
- *.e?f
- *.efd
- *.eps
- *.er?
- *.fbw
- *.fh
- *.flv
- *.frp
- *.gh?
- *.gif
- *.gzip
- *.hbi
- *.hdb
- *.htm
- *.html
- *.ifo
- *.img
- *.indd
- *.iso
- *.iv2i
- *.jpeg
- *.jpg
- *.kdc
- *.key
- *.kwm
- *.ld?
- *.m2v
- *.max
- *.md
- *.md?
- *.mef
- *.mkv
- *.mov
- *.mp4
- *.mpeg
- *.mpg
- *.mrw
- *.nba
- *.ndf
- *.nef
- *.nr?
- *.od?
- *.ol?
- *.one
- *.orf
- *.p12
- *.p7?
- *.pb?
- *.pd?
- *.pef
- *.pem
- *.pfx
- *.png
- *.pps
- *.pps?
- *.ppt
- *.ppt?
- *.psd
- *.pst
- *.ptx
- *.pwm
- *.qbw
- *.r??
- *.sco
- *.sef
- *.sk
- *.sr2
- *.srf
- *.srw
- *.tbk
- *.tc
- *.tib
- *.tif
- *.tmd
- *.txt
- *.v?
- *.v??
- *.v???
- *.wb2
- *.wbb
- *.wim
- *.wmv
- *.wpd
- *.wps
- *.x3f
- *.xl?
- *.xls?
- *.xml
- *.z?
- *.z??
- *.z???
It does the following:
- It appends the extension .LOL! to the encrypted files
It deletes the initially executed copy of itself
NOTES:
The dropped text file how to get data.txt contains the following ransom note:
SOLUTION
9.800
12.346.07
16 Feb 2016
12.347.00
17 Feb 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
Scan your computer with your Trend Micro product and note files detected as RANSOM_CRYPGPCODE.THJ
Step 3
Restart in Safe Mode
Step 4
Search and delete this file
- %User Startup%\Windows.lnk
- %User Temp%\lol.bin
- %User Temp%\pid.txt
- %User Temp%\bind.exe
- %User Temp%\bind.ini
- {malware path}\works_fine.bat
- {all folders with encrypted files}\how to get data.txt
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_CRYPGPCODE.THJ. 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 6
Restore encrypted files from backup.
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