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TROJ_CRYPTWALL.DAM

November 13, 2015
 Analysis by: Mar Philip Elaurza
 ALIASES:

Win32:CryptoWall-C [Trj] (Avast), Worm:Win32/Dorkbot.I (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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.

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size:

250,548 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Nov 2015

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 is the Trend Micro detection for:

  • Damaged variants of the TROJ_CRYPTWALL family
  • Samples detected by this pattern contains code errors, thus they fail to exhibit their intended routines

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

11.416.01

FIRST VSAPI PATTERN DATE:

16 Jan 2015

VSAPI OPR PATTERN File:

11.417.00

VSAPI OPR PATTERN Date:

17 Jan 2015

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

Scan your computer with your Trend Micro product to delete files detected as TROJ_CRYPTWALL.DAM. 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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