Analysis by: MarfelTi
 Modified by: Anthony Joe Melgarejo
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan executes when a user accesses certain websites where it is hosted. It may be hosted on a website and run when a user accesses the said website.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 117,159 bytes
File Type: HTML, HTM
Memory Resident: Yes
Initial Samples Received Date: 28 Dec 2015
Payload: Drops files

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

It may be hosted on a website and run when a user accesses the said website.

This malware arrives via the following means:

  • It may be modified by PE_RAMNIT.H-O or PE_RAMNIT.H

Dropping Routine

This Trojan drops the following files:

  • %AppDataLocal%\Tempsvchost.exe - detected as PE_RAMNIT.H - for Windows Vista and later
  • %User Profile%\Local Settings\Tempsvchost.exe - detected as PE_RAMNIT.H - for Windows XP and prior
  • %User Temp%\svchost.exe - detected as PE_RAMNIT.H-O

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 10.164.05
FIRST VSAPI PATTERN DATE: 19 Jul 2013
VSAPI OPR PATTERN File: 10.165.00
VSAPI OPR PATTERN Date: 19 Jul 2013

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

Close all opened browser windows

Step 3

Remove the malware/grayware file dropped/downloaded by VBS_RAMNIT.SMC. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 4

Scan your computer with your Trend Micro product to clean files detected as VBS_RAMNIT.SMC. 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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