TROJ_AGENT.AUJQ

October 08, 2012
 Analysis by: Kathleen Notario
 Modified 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 malware arrives as a file with ".p7c" extension (Digital ID File) and is bundled with a malware detected by Trend Micro as TROJ_LOADR.AUJQ as its autostart component.

This Trojan arrives as attachment to mass-mailed email messages. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

44,032 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

20 Dec 2010

Payload:

Connects to URLs/Ips

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Backdoor Routine

However, as of this writing, the said sites are inaccessible.

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\svchost.exe - also detected as TROJ_AGENT.AUJQ
  • %User Temp%\smime.p7s - non-malicious file
  • C:\Documents and Settings\All Users\~4DCEXBA84M39FB.dump - non-malicious file
  • %User Startup%\Microsoft Help Center.lnk - shortcut to a copy of itself

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

Other Details

This Trojan attempts to access the following websites to download files, which are possibly malicious:

  • http://infor.{BLOCKED}pdata.com/haOBYvtSvV-uTqlj2R7d0q
  • http://www.aol.com/n/{BLOCKED}tSvV-uTqlj2R7d0q
  • http://www.google.com/{BLOCKED}.{BLOCKED}.0.1/haOBYvtSvV-uTqlj2R7d0q

It did not exhibit backdoor routines during testing.

It does the following:

  • Arrives as a file with ".p7c" extension (Digital ID File) and is bundled with a malware detected by Trend Micro as TROJ_LOADR.AUJQ as its autostart component.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.712.08

VSAPI PATTERN Date:

20 Dec 2010

VSAPI PATTERN Date:

12/20/2010 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

Remove malware files dropped/downloaded by TROJ_AGENT.AUJQ

Step 3

Identify and terminate files detected as TROJ_AGENT.AUJQ

[ 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 4

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
%User Temp%\smime.p7s
C:\Documents and Settings\All Users\~4DCEXBA84M39FB.dump
%User Startup%\Microsoft Help Center.lnk

Step 5

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