TROJ_CVE20170199.A

April 12, 2017
 Analysis by: Ryan Paolo Maglaque
 ALIASES:

Exploit:O97M/Blinky.B(Microsoft);MSWord/Dropper.1B62!exploit(Fortinet);Exploit-RTF.c(McAfee);HEUR:Exploit.MSOffice.Generic(Kaspersky);

 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, 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:

37,517 bytes

File Type:

RTF

Memory Resident:

No

Initial Samples Received Date:

11 Apr 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}x90.com/template.doc

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

As of this writing, the said sites are inaccessible.

Other Details

This Exploit does the following:

  • Upon opening the document, shows the following user prompt:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.336.03

FIRST VSAPI PATTERN DATE:

12 Apr 2017

VSAPI OPR PATTERN File:

13.337.00

VSAPI OPR PATTERN Date:

13 Apr 2017

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_CVE20170199.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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