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Threat Encyclopedia

TROJ_FAKEAV.PTO

ANALYSIS BY

adel


PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW


Trend Micro has flagged this Trojan as noteworthy due to the increased potential for damage, propagation, or both, that it possesses.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may arrive bundled with malware packages as a malware component.

TECHNICAL DETAILS

File Size:

210,432 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

23 Dec 2009

Payload:

Displays graphics/image

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

Installation

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

  • %User Temp%\{malware filename}.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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
WINAG = %User Temp%\{malware filename}.exe /cs:1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
WINAG = C:\Documents and Settings\All Users\Application Data\{random characters}\WinADGuard.exe /s

SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

6.722.04

FIRST VSAPI PATTERN DATE:

26 Dec 2009

VSAPI OPR PATTERN File:

6.723.00

VSAPI OPR PATTERN Date:

23 Dec 2009

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

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • WINAG = C:\Documents and Settings\All Users\Application Data\{random characters}\WinADGuard.exe /s
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • WINAG = %User Temp%\{malware filename}.exe /cs:1

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.PTO. 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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