W97M.Downloader.QK

Classification

Malware

Trojan-Downloader

W97M

W97M.Downloader.QK , Trojan.GenericKD.2465967

Summary

W97M.Downloader.QK is a specially-crafted Microsoft Word document that, when opened silently executes a malicious macro that connects to multiple remote servers to download and display additional components, typically image files and other malware.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

W97M.Downloader.QK typically arrives as a document attached to a spam email message. Like most such messages, the contents of the email are usually tailored to entice the user into opening the attached Word file.

When the file is launched, an embedded macro in the document silently runs and attempts to connect multiple remote servers. If successful, the macro downloads the following files onto the machine:

  • Valid PNG image files that display messages in the Russian language
  • A TXT file that contains a link to download additional malware
  • And a TXT file that contains b64 encoded data

Text file containing b64 encoded data

When the data in this last file is decoded, it contains code for 3 scripts that are written in the VBScript, PowerShell and Batch coding languages. These scripts in turn attempt to download and execute another file from another remote server.

If the file is successfully downloaded, it is saved in the %TEMP% folder as 8.exe and then executed. At the time of analysis, this file is detected as Trojan.GenericKD.2465967.

Date Created: -

Date Last Modified: -