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JS_NIMDA.A

January 18, 2018
 Analysis by: John Anthony Banes
 ALIASES:

I-Worm/Nimda.A.HTM (AVG); HTM.Nimda.A (QuickHeal); Virus legacyascii/Nimda.A (Norman)

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

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

3,369 bytes

File Type:

HTML, HTM

Memory Resident:

No

Initial Samples Received Date:

08 May 2017

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.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

This Java Script is a component of the PE_NIMDA.A worm. It opens the README.EML file that carries the worm. It does not have a destructive payload.

This script does not modify any system and registry file. It's main function is to open the README.EML file that contains the PE_NIMDA.A worm.

  SOLUTION

Minimum Scan Engine:

9.850

VSAPI OPR PATTERN File:

5.883.00

VSAPI OPR PATTERN Date:

15 May 2009

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

Scan your computer with your Trend Micro product to delete files detected as JS_NIMDA.A. 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:


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