TROJ_CVE201711882.UHAOBGZV

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.

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.

Installation

This Exploit drops the following files:

• %User Temp%\dask.bat - Batch file that downloads and executes a file from a specific URL. Deleted when the word processor application is closed by user.

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

Download Routine

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

• http://{BLOCKED}.{BLOCKED}.128.199/a.ex

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

• CVE-2017-11882 | Microsoft Office Memory Corruption Vulnerability

It saves the files it downloads using the following names:

• %User Temp%\win.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

As of this writing, the said sites are inaccessible.