TROJ_AGENT_011484.TOMB
VirTool:Win32/DelfInject (Microsoft); Generic Downloader.nh (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Buzus.lanv (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.545522 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
TECHNICAL DETAILS
1,291,264 bytes
EXE
Yes
21 Jun 2012
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 creates the following folders:
- %User Profile%\kV6QlOuv3Sv1pb7P
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
K8BEWjo0ohDX = "%User Profile%\kV6QlOuv3Sv1pb7P\QRCx2Q2XnQ6k.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\f7968cb09531cc92e3fa4857df312491
It adds the following registry entries:
HKEY_CURRENT_USER\Software\f7968cb09531cc92e3fa4857df312491
7b7bc2512ee1fedcd76bdc68926d4f7b = "{random values}"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\kV6QlOuv3Sv1pb7P\QRCx2Q2XnQ6k.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Delete this registry key
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\Software
- f7968cb09531cc92e3fa4857df312491
Step 4
Delete this 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\Software\Microsoft\Windows\CurrentVersion\Run
- K8BEWjo0ohDX = "%User Profile%\kV6QlOuv3Sv1pb7P\QRCx2Q2XnQ6k.exe"
- In HKEY_CURRENT_USER\Software\f7968cb09531cc92e3fa4857df312491
- 7b7bc2512ee1fedcd76bdc68926d4f7b = "{random values}"
Step 5
Search and delete this file
- %User Profile%\kV6QlOuv3Sv1pb7P\QRCx2Q2XnQ6k.exe
Step 6
Search and delete this folder
- %User Profile%\kV6QlOuv3Sv1pb7P
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_011484.TOMB. 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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