X2KM_BARTALEX.CVB
W97M.Downloader (Symantec), TrojanDownloader:O97M/Bartallex (Microsoft), X97M/Downloader.q (McAfee), Trojan-Downloader.MSExcel.Agent.al (Kaspersky), W97m.Downloader.UI (BitDefender)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
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.
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:
- %User Temp%\{5-digit-random filename}.vbs
- %User Temp%\{5-digit-random filename}.ps1 -> will only be dropped for Windows Vista and above
(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.)
It drops and executes the following files:
- %User Temp%\{5-digit-random filename}.bat
(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.)
Download Routine
This Trojan accesses the following websites to download files:
- http://{BLOCKED}c.su/5751812.jpg - downloaded for Windows XP, 2000, and Server 2003
- http://{BLOCKED}c.su/5757956.jpg - downloaded for Windows Vista and above
It connects to the following URL(s) to download its configuration file:
- http://{BLOCKED}dquarters.com/wp-content/plugins/wordpress-importer/78672738612836.txt
- http://{BLOCKED}dquarters.com/wp-content/plugins/wordpress-importer/papa.txt
- http://{BLOCKED}ada.com/wp-content/plugins/checkout-bluepay/78672738612836.txt
- http://{BLOCKED}ada.com/wp-content/plugins/checkout-bluepay/papa.txt
It saves the files it downloads using the following names:
- %User Temp%\8.exe
(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.)
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
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
Scan your computer with your Trend Micro product to clean files detected as X2KM_BARTALEX.CVB. 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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