ALIASES:

TrojanDropper:Win32/Farfli.E (Microsoft); Generic Dropper.abs (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.Farfli.e (v) (Sunbelt); Gen:Variant.Graftor.6078 (FSecure)

 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.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 155,648 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Mar 2012

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.

Other System Modifications

This Trojan deletes the following files:

  • %System%\syslog.dat
  • %Program Files%\Common Files\Centerv.gzip
  • %System Root%\Net-mysql.sql

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %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).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\333185557

HKEY_LOCAL_MACHINE\SOFTWARE\333185557\
Parameters

HKEY_LOCAL_MACHINE\SOFTWARE\236430969

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\333185557\
Parameters
ServiceDll = "%Program Files%\Common Files\Centerv.gzip"

HKEY_LOCAL_MACHINE\SOFTWARE\333185557\
Parameters
ServiceMain = "woshibaba"

HKEY_LOCAL_MACHINE\SOFTWARE\236430969
imgsvc = "StiSvc,MeudiayCenterl"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RemoteAccess\RouterManagers\
Ip
DLLPath = "%Windows%\Prefetch1090700.dll"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Prefetch1090700.dll
  • %Program Files%\NT_Path.gif
  • %Program Files%\Common Files\Centerv.gzip

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

Other Details

This Trojan deletes the initially executed copy of itself

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

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

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\SOFTWARE
    • 333185557
  • In HKEY_LOCAL_MACHINE\SOFTWARE\333185557
    • Parameters
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 236430969

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\333185557\Parameters
    • ServiceDll = "%Program Files%\Common Files\Centerv.gzip"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\333185557\Parameters
    • ServiceMain = "woshibaba"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\236430969
    • imgsvc = "StiSvc,MeudiayCenterl"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RemoteAccess\RouterManagers\Ip
    • From: DLLPath = "%Windows%\Prefetch1090700.dll"
      To: DLLPath = ""{random values}""

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.
  • %Windows%\Prefetch1090700.dll
  • %Program Files%\NT_Path.gif
  • %Program Files%\Common Files\Centerv.gzip

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_FARDAM.SM. 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.

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System%\syslog.dat
  • %Program Files%\Common Files\Centerv.gzip
  • %System Root%\Net-mysql.sql


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