Analysis by: Mar Philip Elaurza
ALIASES:

Trojan:Win32/Ramnit.A (Microsoft), a variant of Win32/Ramnit.AM virus (Eset), a variant of Win32/Ramnit.AM virus (Ikarus), W32/Ramnit-BD (Sophos)

 PLATFORM:

Windows

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Infects files

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 does not have any propagation routine.

It does not have any backdoor routine.

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: Varies
File Type: EXE, DLL
Memory Resident: No
Initial Samples Received Date: 05 Nov 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.

File Infection

This is the Trend Micro detection for files infected by:

  • PE_RAMNIT.{variant}-O

Propagation

This file infector does not have any propagation routine.

Backdoor Routine

This file infector does not have any backdoor routine.

Dropping Routine

This file infector drops the following files:

  • {Malware Path}\{random} - detected as PE_RAMNIT.{variant}-O

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

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 9.508.03
FIRST VSAPI PATTERN DATE: 05 Nov 2012
VSAPI OPR PATTERN File: 9.509.00
VSAPI OPR PATTERN Date: 06 Nov 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.SM. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • PE_RAMNIT.{variant}-O

Step 3

Scan your computer with your Trend Micro product to delete files detected as PE_RAMNIT.SM. 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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