TROJ_DLOADR.XRI

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.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

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 non-malicious file:

• %Application Data%\NetworkWorkshop\K_5dwd556.n1s

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It creates the following folders:

• %Application Data%\Business Objects
• %Application Data%\NetworkWorkshop

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• ifuckjp10hkk0

Download Routine

This Trojan accesses the following websites to download files:

• kerch.{BLOCKED}i.com/_ktin_si/index.htm
• kerch.{BLOCKED}i.com/_ktin_si/or.txt

It saves the files it downloads using the following names:

• %Application Data%\Business Objects\index.txt
• %Application Data%\Business Objects\or.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

NOTES:

This Trojan reads the content of the downloaded file %Application Data%\Business Objects\index.txt. It then looks for the following strings:

• httennnnntion
• ktteeeempts

It also decrypts and executes the file %Application Data%\Business Objects\or.exe.