
We recently came across a cyber attack that used a remote access Trojan (RAT) called Lost Door, a tool currently offered on social media sites. What also struck us the most about this RAT (detected as BKDR_LODORAT.A) is how it abuses the Port Forward feature in routers. Using this feature enables remote systems to connect to a specific computer or service within a private local-area network (LAN). However, when used maliciously, this feature allows remote attackers to mask their activities in the network and avoid immediate detection. Because this RAT is easy to customize, even knowledge of the indicators of compromise (which may change as a result) may not be sufficient in thwarting the threat. Easily customizable RATs like Lost Door can be hard to detect and protect against, posing a challenge to IT administrators.
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