Analysis by: Sabrina Lei Sioting
 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 opens and executes certain files. It sets the attributes of certain files to Hidden and System.

It opens the file image.jpg in order to trick the user into thinking that the application is legitimate.

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 205 bytes
File Type: BAT
Memory Resident: No
Initial Samples Received Date: 08 Jun 2011

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_DROPPR.FB

Other Details

This Trojan opens the following files:

  • %System Root%\Temp\Cookies\temporarly.reg - detected as REG_FLOODER.BS
  • %System Root%\Temp\Cookies\daemon.exe - legitimate mIRC client
  • %System Root%\Temp\Cookies\image.jpg

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It sets the attributes of the following file(s) to Hidden and System:

  • %System Root%\Temp\Cookies

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

NOTES:

It may also execute the files it opens.

It opens the file image.jpg in order to trick the user into thinking that the application is legitimate.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.211.00
FIRST VSAPI PATTERN DATE: 09 Jun 2011
VSAPI OPR PATTERN File: 8.211.00
VSAPI OPR PATTERN Date: 09 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

Remove malware files dropped/downloaded by BAT_FLOODER.AF

Step 3

Scan your computer with your Trend Micro product to delete files detected as BAT_FLOODER.AF. 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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