TROJ_CVE20170199.JEJOVK

 Analysis by: Michael Jay Villanueva

 ALIASES:

Exploit:O97M/CVE-2017-0199 (Microsoft); Exploit.RTF.CVE-2017-0199.e (Kaspersky); Win32/Exploit.CVE-2017-0199.AK (ESET-NOD32)

 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:

6,215 bytes

File Type:

RTF

Memory Resident:

No

Initial Samples Received Date:

27 Jun 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}.16.242/myguy.xls

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:

NOTES:
The malware contains an embedded object which contains the malicious URL:

The malware is capable of connecting to the malicious URL upon execution, since it contains an "Update Object Class" that points to the embedded object, that will trigger the malware to connect to the malicious URL.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.502.06

FIRST VSAPI PATTERN DATE:

29 Jun 2017

VSAPI OPR PATTERN File:

13.503.00

VSAPI OPR PATTERN Date:

30 Jun 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

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 TROJ_CVE20170199.JEJOVK. 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:


Did this description help? Tell us how we did.