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TROJ_SKINTRI.BCQ

October 09, 2012
 Analysis by: Jasen Sumalapao
 ALIASES:

Trojan:Win32/Skintrim.H (Microsoft), Trojan.Win32.Hrup.gen, Trojan.Win32.Hrup.a (Kaspersky), Trojan.Skintrim (Symantec), Skintrim.gen.c (NAI), Mal/SkimTrim-A (Sophos), Trojan.Win32.Skintrim.H (v) (Sunbelt), W32/Wintrim.F.gen!Eldorado (Authentium), Trojan.Generic.1575299 (Bitdefender), W32/Skintrim.C!tr (Fortinet), W32/Wintrim.F.gen!Eldorado (generic, not disinfectable) (Fprot), Trojan.Win32.Skintrim (Ikarus), a variant of Win32/Kryptik.AOB trojan (NOD32), Trojan W32/Skintrim.DPEP (Norman), Trj/Hrup.J (Panda)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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. It arrives as a component bundled with malware/grayware packages.

It may be injected into processes running in memory.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

240,128 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Aug 2012

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.

It arrives as a component bundled with malware/grayware packages.

Installation

This Trojan may be injected into processes running in memory.

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\mc
remove = {random value}

Other Details

This Trojan requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.312.02

FIRST VSAPI PATTERN DATE:

09 Aug 2012

VSAPI OPR PATTERN File:

9.313.00

VSAPI OPR PATTERN Date:

10 Aug 2012

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

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software
    • mc

Step 4

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