TROJ_AGENT_044561.TOMB
TrojanDownloader:Win32/Fosniw.B (Microsoft); Generic Downloader.id (McAfee); Downloader (Symantec); Trojan-Downloader.Win32.Fosniw.b (v) (Sunbelt); Trojan.Generic.KD.129794 (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
425,984 bytes
EXE
Yes
26 Sep 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.
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
2022293b2f3c2663283528 = "%User Profile%\vbqk.exe"
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\vbqk.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
It adds the following registry entries:
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
DC = "4"
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
idt = "201209260950"
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
ver = "1.0.0.26"
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
Location = "2022293b2f3c2663283528"
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
pid = "wsk1"
HKEY_CURRENT_USER\Software\4d1d1bc34fdc
prj = "5"
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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
- 4d1d1bc34fdc
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
- 2022293b2f3c2663283528 = "%User Profile%\vbqk.exe"
- In HKEY_CURRENT_USER\Software\4d1d1bc34fdc
- DC = "4"
- In HKEY_CURRENT_USER\Software\4d1d1bc34fdc
- idt = "201209260950"
- In HKEY_CURRENT_USER\Software\4d1d1bc34fdc
- ver = "1.0.0.26"
- In HKEY_CURRENT_USER\Software\4d1d1bc34fdc
- Location = "2022293b2f3c2663283528"
- In HKEY_CURRENT_USER\Software\4d1d1bc34fdc
- pid = "wsk1"
- In HKEY_CURRENT_USER\Software\4d1d1bc34fdc
- prj = "5"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_044561.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.
Step 6
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Profile%\vbqk.exe
Did this description help? Tell us how we did.