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| GEN:SID | 1:238 |
| Message | DDOS TFN server response |
| Summary | This event is generated when a Tribe Flood Network (TFN) Distributed Denial of Service (DDoS) daemon responds to a client request to spawn a shell. |
| Impact | Attempted DDoS. If the listed source IP is in your network, it may be a TFN daemon. If the listed destination IP is in your network, it may be a TFN client. |
| Detailed Information | The TFN DDoS uses a tiered structure of compromised hosts to coordinate and participate in a distributed denial of service attack. Clients communicate with daemons to inform them to launch attacks. A daemon will respond with a client request to spawn a shell with an ICMP echo reply with an ICMP identification number of 123, an ICMP sequence number of 0 and a string of "shell bound to port" in the payload. |
| Affected Systems | Any TFN compromised host. |
| Attack Scenarios | After a host becomes a TFN daemon, it will respond to client requests. |
| Ease of Attack | Simple. TFN code is freely available. |
| Corrective Action | Perform proper forensic analysis on the suspected compromised host to discover the means of compromise. Rebuild a confirmed compromised host. Use a packet-filtering firewall to block inappropriate traffic to the network to prevent hosts from being compromised. |
| Additional References | CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0138 Arachnids: http://www.whitehats.com/info/IDS182 |
| Rule References | arachnids: 182 |
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DID:774804
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