Analysis by: Sabrina Lei Sioting
 Modified by: Karl Dominguez
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

TROJ_PEYKE.B may arrive as dropped files of another malware.

It may arrive with component files all detected as TROJ_PEYKE.B.

It creates a file where it uses for its keylogging routines.

Another component file may be responsible for sending the stolen information to remote site(s).

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 51,200 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 30 Apr 2011

Arrival Details

This Trojan may be dropped by other malware.

NOTES:

TROJ_PEYKE.B may arrive as dropped files of another malware.

It may arrive with the following component files all detected as TROJ_PEYKE.B:

  • %System%\riched20.dll
  • %System%\dwmapi.dll
  • %System%\sreiuchp.dll

Please note that legitimate Microsoft files named %System%\dwmapi.dll and %System%\riched20.dll exists. These legitimate files are replaced by the malware. The modified files then loads %System%\sreiuchp.dll everytime the legitimate library files are called by the system.

%System%\sreiuchp.dll is responsible for logging keystrokes. It hooks the keyboard by injecting into EXPLORER.EXE.

It creates the following directory:

  • %User Profile%\Local Settings\Microsoft
  • %User Profile%\Local Settings\Microsoft\Temp

It creates the following file where it uses for its keylogging routines:

  • %User Profile%\Local Settings\Microsoft\Temp\tswpodkx.mui

Another component file may be responsible for sending the stolen information to remote site(s).

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.174.02
FIRST VSAPI PATTERN DATE: 17 May 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and delete files detected as TROJ_PEYKE.B using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

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. %User Profile%\Local Settings\Microsoft

Step 4

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%\riched20.dll

%System%\dwmapi.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_PEYKE.B. 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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