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TROJ_AGENT.BCAK

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 Modified by: Christopher Daniel So
 PLATFORM:

Windows 2000,Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This Trojan may be dropped by other malware. It arrives as a component bundled with malware/grayware packages.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

18 Apr 2012

Payload:

Deletes files, Downloads files

Arrival Details

This Trojan may be dropped by other malware.

It arrives as a component bundled with malware/grayware packages.

Installation

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

  • 320111223
  • 820111118

It terminates itself if it finds the following processes in the affected system's memory:

  • avp.exe

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\Application Data\Sun\Java\jre2.5.8\automngr.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\ctfmon.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\dmaup1.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\dmaup2.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\dmaup3.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\dmaup4.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\rstimgr.dll
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\rstimgr.inf
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\smcnmgr.exe
  • %User Profile%\Application Data\Sun\Java\jre2.5.8\winmsgr.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

NOTES:

The deleted files are file names of the other components in the malware package. It connects to the following malicious URLs:

  • http://{BLOCKED}col.info/bin/read_i.php?{random data}
  • http://{BLOCKED}acy.{BLOCKED}t.us/bin/read_i.php?{random data}
  • http://{BLOCKED}at.{BLOCKED}f.com/bin/read_i.php?{random data}
  • http://{BLOCKED}surance.{BLOCKED}ce.com/bin/read_i.php?{random data}
  • http://{BLOCKED}tic.{BLOCKED}networks.com/bin/read_i.php?{random data}
  • http://{BLOCKED}my.{BLOCKED}2.com/bin/read_i.php?{random data}
  • http://{BLOCKED}rts.{BLOCKED}t.us/bin/read_i.php?{random data}
  • http://{BLOCKED}y.{BLOCKED}andhost.com/bin/read_i.php?{random data}
  • http://{BLOCKED}ne.{BLOCKED}ce.com/bin/read_i.php?{random data}
  • http://{BLOCKED}updates.com/bin/read_i.php?{random data}

{random data} contains the encrypted data of the infected machine's processor information, current code page, Windows version, machine name, user name, number of USB ports, IP address and MAC address. It may download files from the above URLs.

This malware does not have rootkit capabilities.

This malware does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.918.07

FIRST VSAPI PATTERN DATE:

18 Apr 2012

VSAPI OPR PATTERN File:

8.919.00

VSAPI OPR PATTERN Date:

18 Apr 2012

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

Identify and terminate files detected as TROJ_AGENT.BCAK

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.BCAK. 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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