Modified by: Cris Nowell Pantanilla
ALIASES:

Virus:Win32/Ramnit.Z (Microsoft); W32/Ramnit.i (McAfee); Trojan.Gen.2 (Symantec); Virus.Win32.Nimnul.e (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Win32.Ramnit.Y (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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: 131,072 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 14 Jun 2012
Payload: Drops files

Arrival Details

This file infector 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 file infector adds the following mutexes to ensure that only one of its copies runs at any one time:

  • {2D3A33A9-16F8-8BA2-E93F-5E0408381F78}

Dropping Routine

This file infector drops the following files:

  • %Current Folder%\{random} - detected as PE_RAMNIT.EVL-O

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: 9.200
VSAPI OPR PATTERN File: 9.193.00
VSAPI OPR PATTERN Date: 13 Jun 2012

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

Remove the malware/grayware file dropped/downloaded by PE_RAMNIT.EVL

    PE_RAMNIT.EVL-O

Step 3

Scan your computer with your Trend Micro product to clean files detected as PE_RAMNIT.EVL. 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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