Linux AES.ddos/Dofloo Backdoor

AES.ddos or Dofloo is a backdoor with DDoS functionality that accepts commands encrypted with AES.

Exploitation

Stages

1. DDoS sends an initial message to the C2 (command and control). This message contains the version of Linux, CPU, MHz, and RAM usage.
2. DDoS sends a message every second with the CPU percentage usage and network usage in MBPS to the C2.
3. C2 sends commands encrypted with AES.

Prerequisites

The attacker must be able to send crafted packets to the target system.

Alert Logic Coverage

Alert Logic® has evaluated its customer base for exposure to the exploit and has developed signatures for mitigating the threat depending on the security service in place.

The Network-Based Intrusion Detection System (IDS) has been updated with the new signatures for this exploit when detected via Alert Logic Threat Manager™. If this signature is detected, an incident is generated in the Alert Logic console.

Recommendations for Mitigation

The attacker must have exploited some other entry vector to allow the malicious files to become resident on the victim machine.