BKDR_SIMBOT.AE
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives as attachment to mass-mailed email messages. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It connects to a website to send and receive information.
TECHNICAL DETAILS
Varies
EXE
Yes
21 Oct 2011
Arrival Details
This Trojan arrives as attachment to mass-mailed email messages.
It 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%\ldwc.exe - also detected as BKDR_SIMBOT.AE
- %User Temp%\ldwc.bat - batch file component
- %User Temp%\~awinhp.tmp - non-malicious file
- %Current%\.doc - non-malicious microsoft word document
(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.)
It adds the following processes:
- svchost.exe
Backdoor Routine
This Trojan connects to the following websites to send and receive information:
- http://2.{BLOCKED}6.{BLOCKED}0.66/{random}.php?id={parameters}
- http://2.{BLOCKED}6.{BLOCKED}0.66:80/{random}.php?id={parameters}
- http://59.{BLOCKED}1.{BLOCKED}7.182:443/{random}.php?id={parameters}
NOTES:
Upon execution, it opens its dropped Microsoft Word file, .DOC, to hide its malicious routines from the user.
SOLUTION
9.200
8.512.04
21 Oct 2011
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
Search and delete these files
- %User Temp%\ldwc.bat
- %User Temp%\~awinhp.tmp
- %Current%\.doc
Step 3
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_SIMBOT.AE. 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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