RANSOM_WALTRIX.BZJ
Trojan-Ransom.Win32.CryptXXX.xh (Kaspersky), Ransom:Win32/Exxroute.B (Microsoft)
Windows
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 is capable of encrypting files in the affected system.
TECHNICAL DETAILS
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:
- %Start Menu%\{random}.lnk
- {malware path}\svchost.exe
- %Program Data%\{random}.key
- {path of encrypted file}\!Recovery_{random}.txt
- {path of encrypted file}\!Recovery_{random}.html
- %Start Menu%\!Recovery_{random}.txt
- %Start Menu%\!Recovery_{random}.html
- %Start Menu%\!Recovery_{random}.bmp
(Note: %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu 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 Details
This Trojan renames encrypted files using the following names:
- {original file name.file extension}.crypt
It is capable of encrypting files in the affected system.
SOLUTION
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
Step 3
Search and delete these files
- %Start Menu%\{random}.lnk
- {malware path}\svchost.exe
- %Program Data%\{random}.key
- {path of encrypted file}\!Recovery_{random}.txt
- {path of encrypted file}\!Recovery_{random}.html
- %Start Menu%\!Recovery_{random}.txt
- %Start Menu%\!Recovery_{random}.html
- %Start Menu%\!Recovery_{random}.bmp
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WALTRIX.BZJ. 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 5
Restore encrypted files from backup.
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