Trend Micro Research, along with researchers from IssueMakersLab, recently discovered a supply chain attack targeting South Korean organizations, named Operation Red Signature. The attack was targeted to specific IP ranges of certain organizations within South Korea. Malicious updates delivered popular remote access tool, 9002 RAT, to target companies. Once inside the network, attackers were looking to steal user credentials, as well as data from web servers and databases.
Figure 1. Operation Red Signature’s attack chain
Here’s how Operation Red Signature works:
- The code-signing certificate from the remote support solutions provider is stolen. It’s possible that the certificate was stolen as early as April 2018, as we found a ShiftDoor malware (4ae4aed210f2b4f75bdb855f6a5c11e625d56de2) on April 8 that was signed with the stolen certificate.
- Malicious update files are prepared, signed with the stolen certificate, and uploaded to the attacker’s server (207[.]148[.]94[.]157).
- The update server of the company is hacked.
- The update server is configured to receive an update.zip file from the attackers’ server if a client is connecting from a specific range of IP addresses belonging to their targeted organizations.
- The malicious update.zip file is sent to the client when the remote support program is executed.
- The remote support program recognizes the update files as normal and executes the 9002 RAT malware inside it.
- 9002 RAT downloads and executes additional malicious files from the attackers’ server.
The full breaking story is available here:
Source: Trend Micro
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