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TROJ_AGENT.GNQA

June 27, 2014
 Analysis by: Jaime Benigno Reyes
 ALIASES:

TrojanDownloader:Win32/Dofoil (Microsoft)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

  TECHNICAL DETAILS

File Size:

116,224 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

27 Jun 2014

Arrival Details

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

Installation

This Trojan drops and executes the following files:

  • %User Temp%\{random number 1}.tmp.exe
  • %User Temp%\{random number 2}.tmp.exe

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It drops the following copies of itself into the affected system:

  • %Application Data%\{random folder}\{random name}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://cacetech.com
  • http://go.microsoft.com/fwlink/?LinkId={value}
  • http://java.com
  • http://support.microsoft.com
  • http://ui.skype.com/ui/0/4.2.0.169/en/help
  • http://www.adobe.com
  • http://www.adobe.com/support/main.html
  • http://www.msn.com
  • http://www.vb-decompiler.org
  • http://www.wireshark.org
  • http://{BLOCKED}rveryu788.com

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.886.07

FIRST VSAPI PATTERN DATE:

27 Jun 2014

VSAPI OPR PATTERN File:

10.887.00

VSAPI OPR PATTERN Date:

28 Jun 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete these files

[ Learn More ]
There may be some 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%\{random number 1}.tmp.exe
  • %User Temp%\{random number 2}.tmp.exe
  • %Application Data%\{random folder}\{random name}.exe

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT.GNQA. 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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