Analysis by: Cris Nowell Pantanilla
ALIASES:

HEUR:Exploit.MSOffice.Generic (Kaspersky), Exploit-CVE2017-0199.d (McAfee)

 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: Spammed via email

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

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: 221,533 bytes
File Type: RTF
Memory Resident: No
Initial Samples Received Date: 19 Apr 2017
Payload: Downloads files

Arrival Details

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

Download Routine

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

  • http://{BLOCKED}nscar.in/test4.hta ← HTML_OBFUSCA.SA
  • http://{BLOCKED}.{BLOCKED}.67.42/test5.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.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.376.01
FIRST VSAPI PATTERN DATE: 01 May 2017
VSAPI OPR PATTERN File: 13.377.00
VSAPI OPR PATTERN Date: 02 May 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

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

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_HELMINTH.RTF. 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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