SCAN: Any NULL TCP Packet
This signature detects attempts to scan the system for open ports. Attackers can send NULL TCP packet (all flags turned off) to a target port and wait for a response. Open ports respond to a NULL packet with an error message; if no service is running or if no daemon is listening, the port is closed and the system responds with a RST message.
Extended Description
Port scanning is often used by hackers to determine which networks they may be able to break into.
Short Name
SCAN:MISC:NULL
Severity
Warning
Recommended
False
Recommended Action
None
Category
SCAN
Keywords
Any NULL Packet TCP
Release Date
04/22/2003
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3324
False Positive
Unknown