Modified by: Sabrina Lei Sioting
ALIASES:

Trojan:Win32/Ransom.HV (Microsoft); Trojan.Gen.2 (Symantec); Trojan.Win32.Generic!BT (Sunbelt)

 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.

  TECHNICAL DETAILS

File Size: 79,360 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 09 Nov 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.

Installation

This Trojan drops the following files:

  • %System Root%\ProgramData\svcfnmainstvestvs\stppthmainfv.dll
  • %User Temp%\{random numbers}.cmc
  • %User Temp%\{random numbers}.pkt
  • %User Temp%\{random numbers}.dpa
  • {current folder}\{random numbers}.xvx

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %System Root%\ProgramData
  • %System Root%\ProgramData\svcfnmainstvestvs
  • %System Root%\ProgramData\svtstcrs

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.484.04
FIRST VSAPI PATTERN DATE: 24 Oct 2012
VSAPI OPR PATTERN File: 9.485.00
VSAPI OPR PATTERN Date: 25 Oct 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

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.
  • %System Root%\ProgramData
  • %System Root%\ProgramData\svcfnmainstvestvs
  • %System Root%\ProgramData\svtstcrs

Step 3

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
%System Root%\ProgramData\svcfnmainstvestvs\stppthmainfv.dll
%User Temp%\{random numbers}.cmc
%User Temp%\{random numbers}.pkt
%User Temp%\{random numbers}.dpa
{current folder}\{random numbers}.xvx

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.CZZ. 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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