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TROJ_FARFLI.SML0

October 10, 2013
 Analysis by: Jimelle Monteser
 ALIASES:

a variant of Win32/Farfli.VV (NOD32), Trojan.Win32.Sisron (Ikarus), Win32.Troj.Farfli.VV.(kcloud) (Kingsoft), Trojan:Win32/Sisron (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:
 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.

  TECHNICAL DETAILS

File Size:

10,240 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Sep 2013

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 the following copies of itself into the affected system:

  • %Windows%\explor.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
rcmv = "%Windows%\explor.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • 222.{BLOCKED}9.com

  SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

10.275.00

VSAPI OPR PATTERN Date:

13 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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • rcmv = "%Windows%\explor.exe"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FARFLI.SML0. 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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