TROJ_FARFLI.APF

December 13, 2013
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 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:

344,064 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Dec 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:

  • %System Root%\Mopnom.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %Program Files%\Windows Anukme

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Wscdrs gkbqgsdt

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Icubou qiankw

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Wscdrs gkbqgsdt
ReleiceName = "Mopnom.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Wscdrs gkbqgsdt
ReleiceName = "Icubou qiankw"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Icubou qiankw
ConnectGroup = "ĬÈÏ·Ö×é"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Icubou qiankw
MarkTime = "2013-11-08 02:31"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Icubou qiankw
Description = "Igoqsl ihosqihg lgooboysuze"

Dropping Routine

This Trojan drops the following files:

  • %System Root%\8454.vbs
  • %Program Files%\Windows Anukme\Yexitng.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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 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.

  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • Wscdrs gkbqgsdt
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • Icubou qiankw

Step 4

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\SYSTEM\ControlSet001\Services\Wscdrs gkbqgsdt
    • ReleiceName = "Mopnom.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Wscdrs gkbqgsdt
    • ReleiceName = "Icubou qiankw"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Icubou qiankw
    • ConnectGroup = "ĬÈÏ·Ö×é"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Icubou qiankw
    • MarkTime = "2013-11-08 02:31"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Icubou qiankw
    • Description = "Igoqsl ihosqihg lgooboysuze"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %System Root%\8454.vbs
  • %Program Files%\Windows Anukme\Yexitng.exe

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\Windows Anukme

Step 7

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