Operation Red Signature Deliver’s Malware to Target Organizations Through Outside Partner Network

Supply Chain Attacks occurs is an advanced threat that determines the weak link in the supply chain to infiltrate into the organization network.

Security researchers from TrendMicro and IssueMakersLab uncovered Operation Red Signature that launches supply chain attacks targeting organizations in South Korea.

The Threats actor’s behind Operation Red Signature have compromised the server of the support solution provider to deliver remote access tool “9002 RAT” though the update process. The RAT also contains an exploit tool for vulnerability CVE-2017-7269 and an SQL password dumper.

Threat actor’s configured the update servers of support solution provider to deliver malicious files if the victim in their range of interest based on the IP address and the target organizations.

How Operation Red Signature Works

Attackers stolen the codesigning certificates of the support solution providers and signed the malicious files with the stolen certificate and upload to the attacker’s server.

Then the hacked update server of support solution provider is configured to receive the file “update.zip” from the attacker’s server if the user found within the attacker’s interest.

The update.zip contains two files “update.ini” which holds the configuration of remote support solution program and downloads “file000.zip” and “file001.zip” and extracted as “rcview40u.dll” and “rcview.log“.

Then the file “rcview40u.dll” signed with the stolen codesigning certificate will be executed and the DDL files are responsible for decoding the rcview.log file.

The rcview.log is decrypted to 9002 RAT which is the final payload and it connect’s to the C&C server hosted at IP 66[.]42[.]37[.]101.

Researchers said that the 9002 RAT was compiled on July 17, 2018, and starting from 13:35 on July 18 the 9002 RAT being downloaded once the update started. The RAT also serves as a springboard to deliver other malware’s.

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