More Russian language malspam pushing Shade (Troldesh) ransomware

More Russian language malspam pushing Shade (Troldesh) ransomware
Introduction 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. Details 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. Shown above: From malspam to PDF to downloaded zip archive. Pic.zip contained a JavaScript (.js) file designed to infect a vulnerable Windows host when double-clicked. Infection traffic remained similar to previous examples of Shade ransomware, and my infected Windows host exhibited the expected behavior. Shown above: Downloaded zip archive and extracted .js file. Shown above: Traffic from the infection filtered in Wireshark. Shown above: Desktop of an infected Windows host. Shown above: Decryption instructions from the Tor page. Indicators of compromise (IoCs) The following are indicators associated with today's infection: SHA256 hash: 6950efbd9d6d10fdd8f644a71b30e53a8d1dbd64976279d8a192a0c9459d06e1 File name: pic.zakaz.pdf File size: 18,831 bytes File description: PDF attachment from malspam pushing Shade/Troldesh ransomware SHA256 hash: e76b93f6ab032e16f5f1d600cb061db49a10538b10a063561df95be94156ac0b File name: pic.zip File size: 3,493 bytes File location: hxxp://simplerlife[.]pl/wp-content/themes/hueman/assets/admin/css/pic.zip File description: Downloaded zip archive from link in PDF attachment SHA256 hash: 17539e1a0c33fe2f98fa1b8fa282f9f3786ba15419e30ae6c4171ccff65338c9 File size: 6,932 bytes File description: .js file extracted from pic.zip SHA256 hash: 33dde2eed8ccb2b74c9d0feaf19c341354e54cb5d2c9e475507ff3fe22240381 File size: 1,254,664 bytes File location: hxxp://sidneyyin[.]com/templates/joomlage0084-aravnik/css/msg.jpg File location: C:\Users\[username]\AppData\Local\Temp\rad8EEC7.tmp File location: C:\ProgramData\Windows\csrss.exe File description: Downloaded zip archive from link in PDF attachment Traffic from an infected Windows host: 62.212.69[.]227 port 80 - simplerlife[.]pl - GET /wp-content/themes/hueman/assets/admin/css/pic.zip 74.220.207[.]61 port 80 - sidneyyin[.]com - GET /templates/joomlage0084-aravnik/css/msg.jpg Various IP addresses over various TCP ports - Tor traffic port 80 - whatismyipaddress.com - GET / port 80 - whatsmyip.net - GET / Email address and URLs from the decryption instructions: pilotpilot088@gmail.com hxxp://cryptsen7fo43rr6[.]onion/ hxxp://cryptsen7fo43rr6[.]onion.to/ hxxp://cryptsen7fo43rr6[.]onion.cab/ Final words 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. --- Brad Duncan brad [at] malware-traffic-analysis.net	Brad 335 Posts ISC Handler
Subscribe	Feb 20th 2019 3 months ago