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TROJ_SPMAN.KRZ

October 09, 2012
 Analysis by: Roland Marco Dela Paz
 PLATFORM:

Windows Vista, Windows 7, Windows Server 2008 and in Windows Server 2008 R2

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This Trojan may be downloaded by other malware/grayware from remote sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Apr 2012

Payload:

Downloads files

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • JAVA_EXPLOIT.KRZ

It may be downloaded from the following remote sites:

  • http://www.{BLOCKED}se-haccp.org.tw/news/calc.exe

Installation

This Trojan drops the following component file(s):

  • %Program Files%\Common Files\Microsoft Shared\WinlogonUpdate\svchost.exe - also detected as TROJ_SPMAN.KRZ

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It creates the following folders:

  • %Program Files%\Common Files\Microsoft Shared\WinlogonUpdate

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • avp.exe
  • bdagent.exe

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It is capable of downloading other possibly malicious file(s) from remote site(s)

It requires the following additional components to properly run:

  • %Current%\config.ini
  • %Current%\temp.dll

NOTES:

It tries to read the following component which possibly contains malware configuration:

  • %Current%\config.ini

It executes the following commands in command prompt:

  • "cmd.exe /c wusa.exe C:\_virus\temp.dll /extract:C:\WINDOWS\system32\sysprep\ /quiet"
  • "cmd.exe /c C:\WINDOWS\system32\sysprep\sysprep.exe "
  • "C:\_virus\svchost.exe"" ""-cmd -uninstall -bncc"""

  SOLUTION

Minimum Scan Engine:

9.200

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

Remove malware/grayware files that dropped/downloaded TROJ_SPMAN.KRZ

     JAVA_EXPLOIT.KRZ

Step 3

Search and delete these folders

[ 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%\Common Files\Microsoft Shared\WinlogonUpdate

Step 4

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
    • WNetDHCP

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_SPMAN.KRZ. 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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