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TROJ_MALAGENT.AN

October 08, 2012
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size:

107,008 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

27 Sep 2010

Installation

This Trojan drops the following file(s)/component(s):

  • %System%\ctfmlpq.dll - also detected as TROJ_MALAGENT.AN

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Its DLL component is injected to the following process(es):

  • Explorer.exe

It executes then deletes itself afterward.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Session Manager\AppCertDlls
packwdeb = %System%\ctfmlpq.dll

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

07.494.06

VSAPI PATTERN Date:

27 Sep 2010

VSAPI PATTERN Date:

9/27/2010 12:00:00 AM

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\AppCertDlls
    • packwdeb = %System%\ctfmlpq.dll

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MALAGENT.AN. 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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