TROJ_AGENT_041341.TOMB
Backdoor:Win32/Simda (Microsoft); Trojan.Gen (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Gen:Variant.Kazy.40831 (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
241,338 bytes
EXE
No
05 Jul 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 drops the following copies of itself into the affected system:
- %Windows%\apppatch\bcqcfax.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\1.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
f0bdff95 = "{random characters}"
Dropping Routine
This Trojan drops the following files:
- %Windows%\apppatch\bcqcfax.exe
- %Temp%\2.tmp
- %Temp%\4.tmp
- %Temp%\5.tmp
- %Temp%\6.tmp
- %Temp%\7.tmp
- %Temp%\8.tmp
- %Temp%\9.tmp
- %Temp%\A.tmp
- %Temp%\B.tmp
- %Temp%\C.tmp
- %Temp%\D.tmp
- %Temp%\E.tmp
- %Temp%\F.tmp
- %Temp%\3.tmp
- %Temp%\10.tmp
- %Temp%\11.tmp
- %Temp%\13.tmp
- %Temp%\12.tmp
- %Temp%\14.tmp
- %Temp%\16.tmp
- %Temp%\17.tmp
- %Temp%\15.tmp
- %Temp%\19.tmp
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}s.com/login.php
- http://{BLOCKED}r.com/login.php
- http://{BLOCKED}x.com/login.php
- http://{BLOCKED}b.com/login.php
- http://{BLOCKED}w.com/login.php
- http://{BLOCKED}k.com/login.php
- http://{BLOCKED}h.com/login.php
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
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- f0bdff95 = "{random characters}"
Step 3
Search and delete these files
- %Windows%\apppatch\bcqcfax.exe
- %Temp%\2.tmp
- %Temp%\4.tmp
- %Temp%\5.tmp
- %Temp%\6.tmp
- %Temp%\7.tmp
- %Temp%\8.tmp
- %Temp%\9.tmp
- %Temp%\A.tmp
- %Temp%\B.tmp
- %Temp%\C.tmp
- %Temp%\D.tmp
- %Temp%\E.tmp
- %Temp%\F.tmp
- %Temp%\3.tmp
- %Temp%\10.tmp
- %Temp%\11.tmp
- %Temp%\13.tmp
- %Temp%\12.tmp
- %Temp%\14.tmp
- %Temp%\16.tmp
- %Temp%\17.tmp
- %Temp%\15.tmp
- %Temp%\19.tmp
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_041341.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 5
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 Temp%\1.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
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