Russian language spam pushing Shade ransomware (also known as Troldesh ransomware) has remained active since my previous ISC diary about it on 2018-11-29. However, sometime in February 2019, this malicious spam (malspam) has altered its tactics slightly. Instead of a zip archive directly attached to the malspam, recent emails have attached PDF files with links to download the zip archive. Otherwise, this infection activity remains relatively unchanged.
Malspam pushing Shade has a variety of subjects, spoofed sending addresses, and message text. The common theme is some sort of order or invoice. The attached PDF files have links to download an alleged invoice, which was saved as pic.zip when I checked.
Indicators of compromise (IoCs)
The following are indicators associated with today's infection:
Traffic from an infected Windows host:
Email address and URLs from the decryption instructions:
As I stated last time, Russian language malspam pushing Shade/Troldesh ransomware is nothing new. Since I first posted a diary about it back in 2016, it's never disappeared for long. Nor is this malspam limited to Russian language. An example I documented in 2017 was from English malspam. This diary is yet another reminder the criminals behind this malware remain active.
Feb 20th 2019
8 months ago