Analysis by: Roland Marco Dela Paz
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan is a batch file compiled using a software called ExeScript in order to be converted and protected as an executable file (EXE).

Upon execution, it drops, executes, and deletes the original batch file as %Current%\untitled1.bat.

It aids in modifying (hiding/unhiding) attributes of IRC nicknames that it uses by using the DOS command "attrib."

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: Varies
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 08 Jun 2011
Payload: Deletes files, Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_DROPPR.FB

NOTES:

It is a batch file compiled using a software called ExeScript in order to be converted and protected as an executable file (EXE).

Upon execution, it drops, executes, and deletes the original batch file as %Current%\untitled1.bat.

It aids in modifying (hiding/unhiding) attributes of IRC nicknames that it uses by using the DOS command "attrib."

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.212.08
FIRST VSAPI PATTERN DATE: 09 Jun 2011
VSAPI OPR PATTERN File: 8.213.00
VSAPI OPR PATTERN Date: 10 Jun 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

Scan your computer with your Trend Micro product to delete files detected as TROJ_BIRTTA.A. 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.

NOTES:
Remove related malware detected as:


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