JavaScript being used to distribute GandCrab ransomware

January 4, 2019

SonicWall RTDMI engine has recently detected a surge in archive files (~1600-8900 Bytes in size) floating in the network.

Unavailability of the archive file in any of the popular threat intelligence sharing portals like the VirusTotal and the ReversingLabs indicates its uniqueness and limited distribution.


The archive files carries a JavaScript file.

The JavaScript file has code to download another malware with some garbage code. The JavaScript file downloads a second stage malware which on further analysis is found to be a downloader.

The second stage downloader, downloads a variant of a popular ransomware family “GandCrab”

The GANDCRAB family is known for asking ransom from the victim after file encryption.


Evidence of the detection by RTDMI engine can be seen below in the Capture ATP report for this file: