Sunday, December 3, 2023

Beware of New Trigona Ransomware Attacking Finance and Marketing Industries

The relatively new Trigona ransomware strain, according to Unit 42 researchers, was particularly active in December 2022, targeting industries in the manufacturing, finance, construction, agriculture, marketing, and high technology industries.

“Trigona’s threat operator engaging in behavior such as obtaining initial access to a target’s environment, conducting reconnaissance, transferring malware via remote monitoring and management (RMM) software, creating new user accounts and deploying ransomware,” Unit 42 researchers.

Companies in the United States, Australia, New Zealand, Italy, France, and Germany were affected.

Specifics of the Trigona Ransomware

From the recent analysis, researchers say that unique computer IDs (CIDs) and victim IDs are included in Trigona’s ransom notes, which are presented via an HTML application with embedded JavaScript rather than the typical text file (VID).

Image 1 is a screenshot of a sample Trigona ransom note that tells a business its network is encrypted, the three steps of instructions for data recovery, and tips to make the price cheaper. There is also a “Need help?” link.
Sample Trigona ransom note

The ransom note’s JavaScript contains the following details:

  • A uniquely generated CID and VID
  • A link to the negotiation Tor portal
  • An email address to contact.

At least 15 possible victims who were compromised in December 2022 may be found, according to experts. Also, in January 2023 and February 2023, they discovered two new Trigona ransom notes.

There was no proof that Trigona was using a leak site for double extortion when it was originally discovered. The victims were sent to their negotiating portal by their ransom message instead. A researcher identified a leak site attributable to Trigona hosted on a specific IP address.

Image 3 is a screenshot of the Trigona leak site. It details current leaks, views, if the leak is active, and a counter showing how much time is left. Details including screenshots are available, as well as the ransom amounts. There is a green button to place a bid.
Trigona leak site

Additionally, tactics, techniques, and procedures (TTPs) used by Trigona operators and CryLock ransomware operators coincide, indicating that the threat actors who previously used CryLock ransomware may have switched to using Trigona ransomware.

Image 5 is a screenshot of the Russian antimalware forum SafeZone where someone has posted asking for help with Crylock. Highlighted in red is an email address.
A user on SafeZone, a Russian anti-malware forum, seeking help for Crylock ransomware

Both ransomware families drop ransom notes in HTML Application format, and the ransom message is similar, including:

  • Their claim that all “documents, databases, backups, and other critical” files and data were encrypted
  • AES is their choice of cryptographic algorithm
  • Their statement that “the price depends on how soon you will contact us.”

Hence, by unveiling Trigona and its unusual method of obfuscating malware utilizing password-protected executables, defenders can better defend their organizations against this threat.

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