W2KM_THUS.A

June 29, 2016
 Analysis by: Pearl Charlaine Espejo
 ALIASES:

W97M.Sillycopy (Symantec); Virus:W97M/Thus.GB (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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.

  TECHNICAL DETAILS

File Size:

34,816 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

14 Jun 2016

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.

Other Details

This file infector does the following:

  • It infects any active Microsoft Word document files. It does this by copying its macro code to the open documents.
  • It initially checks if "APMP" and "KILL" is present as line 1 and line 2 in the project template. This serves as its infection marker.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.592.05

FIRST VSAPI PATTERN DATE:

15 Jun 2016

VSAPI OPR PATTERN File:

12.593.00

VSAPI OPR PATTERN Date:

16 Jun 2016

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as W2KM_THUS.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 this Knowledge Base page for more information.

Step 4

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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