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TROJ_FAKEAV.YRM

September 11, 2013
 Analysis by: Andrei Castillo
 ALIASES:

Rogue:Win32/FakeRean(Microsoft), a variant of Win32/Kryptik.BJTO trojan(NOD32), Trojan.Win32.Generic.pak!cobra(Sunbelt), TR/Crypt.XPACK.Gen(Antivir)

 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:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • 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.

It uses a convincing Graphical User Interface to make the users think that the software is legitimate.

  TECHNICAL DETAILS

File Size:

841,728 bytes

File Type:

EXE

Memory Resident:

Yes

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.

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\Run
Internet Security = "%Original File Path of Malware%\{random file name}.exe"

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.264.02

FIRST VSAPI PATTERN DATE:

07 Sep 2013

VSAPI OPR PATTERN File:

10.265.00

VSAPI OPR PATTERN Date:

07 Sep 2013

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

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
    • Internet Security = "%Original File Path of Malware%\{random file name}.exe"

Step 4

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