RANSOM_WALTRIX.B
Trojan:Win32/Dynamer!ac (Micorosft); a variant of Win32/Kryptik.EUSG (ESET); Trojan.Cryptolocker.AN (Symantec); Ransom.CryptXXX (Malwarebytes);
Windows
![](/vinfo/imgFiles/legend.jpg)
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.
TECHNICAL DETAILS
Varies
DLL
Yes
25 Apr 2016
Encrypts files, Connects to URLs/IPs, Steals information
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 non-malicious files:
- %All Users Profile%\Application Data\{random file name}.dat
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Pattern = ""
(Note: The default value data of the said registry entry is "{User Preference}".)
HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"
(Note: The default value data of the said registry entry is "{User Preference}".)
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%System Root%\Python{version}\tcl\tk{version}\demos\images\de_crypt_readme.bmp"
(Note: The default value data of the said registry entry is "{User Preference}".)
Other Details
This Trojan encrypts files with the following extensions:
- .mp4
- .psd
- .mp3
- .mid
- .wma
- .flv
- .mkv
- .mov
- .avi
- .asf
- .mpeg
- .vob
- .mpg
- .wmv
- .fla
- .swf
- .wav
- .qcow2
- .vdi
- .vmdk
- .vmx
- .gpg
- .aes
- .ARC
- .PAQ
- .tar
- .bz2
- .tbk
- .bak
- .tar
- .tgz
- .rar
- .zip
- .djv
- .djvu
- .svg
- .bmp
- .png
- .gif
- .raw
- .cgm
- .jpeg
- .jpg
- .tif
- .tiff
- .NEF
- .cmd
- .bat
- .class
- .jar
- .java
- .asp
- .brd
- .sch
- .dch
- .dip
- .vbs
- .asm
- .pas
- .cpp
- .php
- .ldf
- .mdf
- .ibd
- .MYI
- .MYD
- .frm
- .odb
- .dbf
- .mdb
- .sql
- .SQLITEDB
- .SQLITE3
- .asc
- .lay6
- .lay
- .ms11
- .sldx
- .ppsm
- .ppsx
- .ppam
- .docb
- .mml
- .sxm
- .otg
- .odg
- .uop
- .potx
- .potm
- .pptx
- .pptm
- .std
- .sxd
- .pot
- .pps
- .sti
- .sxi
- .otp
- .odp
- .wks
- .xltx
- .xltm
- .xlsx
- .xlsm
- .xlsb
- .slk
- .xls
- .doc
- .xlw
- .xlt
- .xlm
- .xlc
- .dif
- .stc
- .sxc
- .ots
- .ods
- .hwp
- .dotm
- .dotx
- .docm
- .docx
- .DOT
- .max
- .xml
- .txt
- .CSV
- .uot
- .RTF
- .XLS
- .PPT
- .stw
- .sxw
- .ott
- .odt
- .DOC
- .pem
- .csr
- .crt
- .key
- .eml
- .dcu
- .obj
It renames encrypted files using the following names:
- {original file name}.crypt
It does the following:
- It checks if it is being run in a virtual environment by querying the registry entry:
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString - It prevents to encrypt files containing any of the strings in its full pathname:
- \Canon\
- Roaming\Apple
- Antivirus
- plugscan
- Microsoft
- Windows
- Google\Chrome
- Plugins
- Microsoft\Windows
- winnt
- Application Data
- AppData
- Program Files
- temp
- thumbs.db
- Recycle Bin
- System Volume Information
- Boot
- Windows
NOTES:
This malware drops the following files whenever it is able to encrypt files:
de_crypt_readme.txt
de_crypt_readme.html
de_crypt_readme.bmp
It steals the following information from the following programs:
- BulletProof FTP
- CuteFTP 6 Homec
- CuteFTP 6 Professional
- CuteFTP 7 Homec
- CuteFTP 7 Professional
- CuteFTP 8 Home
- CuteFTP 8 Professional
- Digsby
- Far
- Far2
- FileZilla
- FlashFXP 3
- FlashFXP 4
- FTP Explorer
- FTPClient
- FTPRush
- FTPWare COREFTP
- Google Talk
- Internet Account Manager
- Ipswitch WS_FTP
- MySpace
- Outlook
- Outlook Express
- Paltalk
- Pidgin
- Scribe
- SmartFTP
- SoftX.org FTPClient
- Sota FFFTP
- Total Commander
- Trillian
- TurboFTP
- VanDyke
- Windows Commander
- Windows Live Mail
It also steals information from cookies, Google Chrome User Data, and Bitcoin wallet files containing the following in their file name:
- WALLET
- _WALLET
- .WALLET
SOLUTION
9.800
12.480.05
21 Apr 2016
12.481.00
22 Apr 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
Restore this modified 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\Control Panel\Desktop
- From: Pattern = ""
To: Pattern = "{User Preference}"
- From: Pattern = ""
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: TileWallpaper = "0"
To: TileWallpaper = "{User Preference}"
- From: TileWallpaper = "0"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: Wallpaper = "%System Root%\Python{version}\tcl\tk{version}\demos\images\de_crypt_readme.bmp"
To: Wallpaper = "{User Preference}"
- From: Wallpaper = "%System Root%\Python{version}\tcl\tk{version}\demos\images\de_crypt_readme.bmp"
Step 4
Search and delete these files
- %All Users Profile%\Application Data\{random file name}.dat
- de_crypt_readme.bmp
- de_crypt_readme.html
- de_crypt_readme.txt
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_WALTRIX.B. 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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