GIAC
GCIH · Question #357
In the network logs there are ACK/FIN/PSH/URG packets from a host going to a closed port, and SYN/FIN/URG/PSH packets going to open ports. What is the host likely doing?
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Reconnaissance, Scanning, and Enumeration
Question
In the network logs there are ACK/FIN/PSH/URG packets from a host going to a closed port, and SYN/FIN/URG/PSH packets going to open ports. What is the host likely doing?
Options
- AActive OS fingerprinting
- BHost discovery
- CPassive OS fingerprinting
- DIDS evasion
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Topics
#TCP flag scanning#host discovery#abnormal flag combinations#port scanning