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TRIGONA RANSOMWARE TARGETS MICROSOFT SQL SERVERS

April 20, 2023  By Pierluigi Paganini




THREAT ACTORS ARE HACKING POORLY SECURED AND INTERNED-EXPOSED MICROSOFT SQL
SERVERS TO DEPLOY THE TRIGONA RANSOMWARE.

Threat actors are hacking into poorly secured and public-facing Microsoft SQL
servers to deploy Trigona ransomware.

Trigona is a malware strain that was discovered in October 2022, and Palo Alto
Unit 42 researchers reported similarities between Trigona and the CryLock
ransomware.

Trigona is written in Delphi language, it encrypts files without distinguishing
their extensions and appends the “._locked” extension to the filename of
encrypted files.

The attackers launch brute-force or dictionary attacks against the server in an
attempt to guess account credentials.

Once gained access to the server, the threat actors deploy malware that is
tracked by cybersecurity firm AhnLab as CLR Shell.

CLR Shell allows operators to harvest system information and escalate privileges
to LocalSystem by exploiting a vulnerability in the Windows Secondary Logon
Service.

“In addition, this CLR Shell malware is confirmed to have a routine that
exploits privilege escalation vulnerabilities, which is believed to be due to
the high privileges required by Trigona as it operates as a service.” reads the
report published by AhnLab. “CLR Shell is a type of CLR assembly malware that
receives commands from threat actors and performs malicious behaviors, similarly
to the WebShells of web servers.”

The analysis of the log from AhnLab’s ASD shows the MS-SQL process sqlservr.exe
installing Trigona under the name svcservice.exe.

When svcservice.exe is executed as a service, it executes the Trigona ransomware
and also creates and executes svchost.bat used to execute the ransomware. The
svchost.bat registers the Trigona binary to the Run key to maintain persistence.

The svchost.bat also deletes volume shadow copies and disables the system
recovery feature to prevent victims from recovering the encrypted files.

The ransomware creates ransom notes named “how_to_decrypt.hta” in each folder,
the note includes instructions to contact the Trigona operators. The ransom note
contains a link to the Trigona Tor negotiation website, and a link containing
the key to log into the negotiation site.

“Admins must also use passwords that cannot be easily guessed and change them
periodically to protect the database servers from brute force and dictionary
attacks.” concludes the report. “V3 should be updated to the latest version so
that malware infection can be prevented. Administrators should also use security
programs such as firewalls for database servers accessible from outside to
restrict access by external threat actors. If the above measures are not taken
in advance, continuous infections by threat actors and malware can occur.”



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Pierluigi Paganini

(SecurityAffairs – hacking, Microsoft SQL, Trigona ransomware)




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PIERLUIGI PAGANINI

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and
Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he
is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security
expert with over 20 years experience in the field, he is Certified Ethical
Hacker at EC Council in London. The passion for writing and a strong belief that
security is founded on sharing and awareness led Pierluigi to find the security
blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some
major publications in the field such as Cyber War Zone, ICTTF, Infosec Island,
Infosec Institute, The Hacker News Magazine and for many other Security
magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency
and Bitcoin”.




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Russian national sentenced to time served for committing money laundering for
the Ryuk ransomware operation


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Copyright 2021 Security Affairs by Pierluigi Paganini All Right Reserved.
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