Analysis by: John Anthony Banes
ALIASES:

Exploit.RTF-ObfsStrm.Gen (BitDefender); Exploit:O97M/CVE-2017-0199.D (Microsoft); Exploit-CVE2017-0199.bj (NAI)

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

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.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 235,290 bytes
File Type: RTF
Memory Resident: No
Initial Samples Received Date: 17 Jul 2018
Payload: Connects to URLs/IPs, Displays message/message boxes, Downloads files

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}gstrustbank.tk/petit/zone/udo.hta

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

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

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: 14.384.02
FIRST VSAPI PATTERN DATE: 17 Jul 2018
VSAPI OPR PATTERN File: 14.385.00
VSAPI OPR PATTERN Date: 18 Jul 2018

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.TIDBOBL. 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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