TROJ_SCAR.SSB


 ALIASES:

Trojan:Win32/Simda.gen!A (Microsoft), Backdoor.Trojan (Symantec), Trojan.Win32.Meredrop (Sunbelt), W32/FraudLoad.DIA!tr (Fortinet), Win32/Spy.Shiz.NBE (Eset),

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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:

39,936 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Dec 2010

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%\{random}.exe

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

It injects itself into the following processes running in the affected system's memory:

  • svchost.exe

Autostart Technique

This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe, %System%\{random}.exe,"

(Note: The default value data of the said registry entry is "%System%\userinit.exe,".)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ikss.com/knock.php?n=DC0C021C&s=seller-15
  • http://www.{BLOCKED}fficsource.com/dc/zc.php?domain={BLOCKED}ikss.com
  • http://www.{BLOCKED}fficsource.com/dc/zc_OLD.php?domainname={BLOCKED}ikss.com

  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

Identify and delete files detected as TROJ_SCAR.SSB using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

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\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Userinit = "%System%\userinit.exe, %System%\{random}.exe,"
      To: Userinit = "%System%\userinit.exe,"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_SCAR.SSB. 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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