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AhnLab’s Security Emergency Response Center (ASEC) studies attacks on poorly secured Linux SSH servers and shares the findings on the ASEC Blog.
Attackers need to find out the IP address and SSH account details before installing malware like DDoS bot and CoinMiner. They scan for servers with the SSH service (port 22) activated to carry out brute force or dictionary attacks to get the login information.
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Threat actors gain more cryptocurrency by controlling more CoinMiners. They also have the ability to launch stronger DDoS attacks by controlling more DDoS bots. However, in order to increase the number of CoinMiners and DDoS bots, they need to gather more information or account credentials from their targets.
In addition to DDoS bots and CoinMiners, attackers can also install malware to perform scanning and brute force or dictionary attacks on infected systems, allowing them to take advantage of more vulnerable systems. Attackers can also just install scanners and sell the breached IP and account credentials on the dark web.
Poorly managed SSH servers can become targets for various types of malware, including SSH scanner, DDoS bots, and CoinMiners. This post analyzes cases of attacks involving these malware.
