Infection Channel: Via email
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. 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 executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
File size: 164,865 bytes
File type: RTF
Initial samples received date: 17 Apr 2012
Payload: Drops files
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
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 non-malicious file:
(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.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\kser.exe - detected as BKDR_POISON.DOC
(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 takes advantage of the following software vulnerabilities to drop malicious files:
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
NOTES:
Upon execution, it opens its dropped non-malicious .DOC file %User Temp%\Wor.doc in order to hide its malicious routines from the user.
(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.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
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