Analysis by: Jennifer Gumban
 PLATFORM:

Windows

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

  • Threat Type: Exploit

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware, Spammed via email

This malware exploits a vulnerability found in Microsoft Office known as CVE-2017-0199. There are reports that exploits using the said vulnerability are in the wild. A security patch for the vulnerability is already out and available.

This Exploit arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 32,945 bytes
File Type: PPTX
Memory Resident: No
Initial Samples Received Date: 28 Jul 2017
Payload: Connects to URLs/IPs, Displays message/message boxes

Arrival Details

This Exploit arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Download Routine

This Exploit connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.218.230:3550/logo.doc
  • http://{BLOCKED}.{BLOCKED}.218.230:3550/ratman.exe

It takes advantage of the following software vulnerabilities to download possibly malicious files:

Trend Micro detects the dowloaded file as:

  • TROJ_KRYPTIK.XXWA

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.850

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 malware/grayware files dropped/downloaded by TROJ_CVE20170199.JVU. (Note: Please skip this step if the threats listed below have already been removed.)

     TROJ_KRYPTIK.XXWA

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_CVE20170199.JVU. 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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