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TSPY64_KEYLOG.OF

June 07, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

TR/Dropper.Gen (Antivir)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (64-bit), Windows Vista (64-bit), Windows 7 (64-bit)

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It logs a user's keystrokes to steal information.

It does not send out the information it steals.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE, DLL

Memory Resident:

No

Initial Samples Received Date:

04 Jun 2013

Payload:

Drops files

Arrival Details

This spyware 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 spyware drops the following files:

  • %System%\{random file name 1}.dll - also detected as TSPY64_KEYLOG.OF
  • %System%\{random file name 2}.dat - encrypted file

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This spyware modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\AppMgmt\Parameters
ServiceDll = "%System%\{random file name 1}.dll"

(Note: The default value data of the said registry entry is "%System%\appmgmts.dll".)

Dropping Routine

This spyware drops the following file(s), which it uses for its keylogging routine:

  • %Windows%\Temp\{random file name 3}.tmp - contains encrypted key logs

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

Information Theft

This spyware logs a user's keystrokes to steal information.

Drop Points

This spyware does not send out the information it steals.

Other Details

This spyware deletes the initially executed copy of itself

NOTES:
It modifies the registry to register its dropped component as a system service.

  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

Scan your computer with your Trend Micro product and note files detected as TSPY64_KEYLOG.OF

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Restore this modified 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\AppMgmt\Parameters
    • From: ServiceDll = "%System%\{random file name 1}.dll"
      To: ServiceDll = %System%\appmgmts.dll

Step 5

Search and delete this file

[ Learn More ]
There may be some files 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%\{random file name 2}.dat
  • %Windows%\Temp\{random file name 3}.tmp

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY64_KEYLOG.OF. 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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