W2KM_DRIDEX.YVD
Trojan:O97M/Madeba.A!det (Microsoft), VBA/TrojanDropper.Agent.BDO trojan (ESET)
Windows
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Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Dropping Routine
This Trojan drops the following files:
- %User Temp%\harakiri.pfx - encoded harakiri.exe
- %User Temp%\harakiri.exe - detected as TSPY_DRIDEX.YVD
(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 executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
Other Details
This Trojan does the following:
- The embedded malicious macro code executes the following command to decode and execute a malicious binary:
cmd /c certutil -decode %TMP%\harakiri.pfx %TMP%\harakiri.exe & start %TMP%\harakiri.exe
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
Remove the malware/grayware file dropped/downloaded by W2KM_DRIDEX.YVD. (Note: Please skip this step if the threat(s) listed below have already been removed.)
- TSPY_DRIDEX.YVD
Step 4
Search and delete these files
- %User Temp%\harakiri.pfx
- %User Temp%\harakiri.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as W2KM_DRIDEX.YVD. 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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