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TROJ_SCAR.AR

October 08, 2012
 Modified by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

69,632 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

22 Dec 2009

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System%\{random file name}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
Description = Providesumq a domain server for NI security.

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
DisplayName = Computer Safe xxi Instruments Domain Service

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
ErrorControl = 0

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
ImagePath = %System%\{random file name}.exe

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
ObjectName = LocalSystem

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
Start = 2

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\
SafePrecgxv
Type = 16

Download Routine

As of this writing, the said sites are inaccessible.

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}9.206.34:8080
  • http://imddos.my03.com:9090/978212376.html

  SOLUTION

Minimum Scan Engine:

8.900

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

Scan your computer with your Trend Micro product and note files detected as TROJ_SCAR.AR

Step 3

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\CurrentControlSet\Services\
    • SafePrecgxv

Step 4

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