TROJ_AGENTT.DRP

 Analysis by: Christopher Daniel So

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes


  TECHNICAL DETAILS

File Size:

24,064 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 Sep 2010

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\Microsoft\imipapi.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.)

It drops the following non-malicious files:

  • %User Profile%\Application Data\Microsoft\c_6a00.n1s
  • %User Temp%\Adv.dll

(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.. %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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{966D9F4E-13DE-6359-D7F0-00ECAA8A54ED}
stubpath = "%User Profile%\Application Data\Microsoft\imipapi.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}honar.com/_vmi_api/index_vmjp.html
  • http://{BLOCKED}honar.com/_vmi_api/Maceety1.html

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.502.09

FIRST VSAPI PATTERN DATE:

29 Sep 2010

VSAPI OPR PATTERN File:

7.503.00

VSAPI OPR PATTERN Date:

29 Sep 2010

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_AGENTT.DRP

[ 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

Delete this registry key

[ 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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\
    • {966D9F4E-13DE-6359-D7F0-00ECAA8A54ED}

Step 4

Search and delete these files

[ 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 Profile%\Application Data\Microsoft\c_6a00.n1s
  • %User Temp%\Adv.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENTT.DRP. 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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