Analysis by: Christian Noel Olalia
ALIASES:

W32.Ramnit!html (SYMANTEC); Virus:VBS/Ramnit.B (MICROSOFT); Trojan-Dropper.VBS.Agent.bp (KASPERSKY)

 PLATFORM:

Windows

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

  TECHNICAL DETAILS

File Size: 17,011 bytes
File Type: HTML, HTM
Memory Resident: No
Initial Samples Received Date: 30 Jan 2018

Installation

This Trojan drops the following files:

  • %User Temp%\IDC2.tmp\FP_AX_CAB_INSTALLER64.exe

(Note: %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.)

Dropping Routine

This Trojan executes the dropped file. As a result, malicious routines of the dropped file are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.936.05
FIRST VSAPI PATTERN DATE: 30 Jan 2018
VSAPI OPR PATTERN File: 13.937.00
VSAPI OPR PATTERN Date: 31 Jan 2018

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

Search and delete this file

[ Learn More ]
There may be some 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.  
  • %User Temp%\IDC2.tmp\FP_AX_CAB_INSTALLER64.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as HTML_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 the following Trend Micro Support pages for more information:


Did this description help? Tell us how we did.