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Signature Actions

Signature Parameters. Signature Actions. TVR. Non Aggressive Actions Produce Alert Produce Verbose Alert Log Attacker Packets Log Victim Packets Log pair Packets Request SNMP trap. Common Signature Parameters Signature ID SubSig ID Alert Severity (H,M,L,I) Sig Fidelity (0-100)

irene-manning
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Signature Actions

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  1. Signature Parameters Signature Actions TVR Non Aggressive Actions Produce Alert Produce Verbose Alert Log Attacker Packets Log Victim Packets Log pair Packets Request SNMP trap Common Signature Parameters Signature ID SubSig ID Alert Severity (H,M,L,I) Sig Fidelity (0-100) Promis delta (0-30) Sig Name TO FIRE THE SIG Event Count Event count Key AaBb Interval TO GENERATE ALERT Summary Mode Summary Key AaBb Summary Threshold Global Summary Threshold Summary Interval Enabled/Retired ASR Target Asset value Potential Damage SFR/PD Risk Rating Signature Accuracy Aggressive Actions Deny Packet Inline (Single) Deny Connection Inline (udp/tcp) Deny Attacker Inline (S/IP) Deny Attacker-Victim pair Inline (S/IP & D/IP) Deny Attacker-service pair Inline (S/IP to D/Port) Reset TCP Connection Request Block Connection Request Block Host Request rate Limit Modify Packet Inline WLR (CSA) ARR/OS Clues from Others Attack Relevancy RR= (ASR*TVR*SFR/10000) +ARR –PD +WLR Specific Signature Parameters Atomic IP Engine Parameters IP Addr Options IP Payload length TCP Mask urg,ack,psh,rst,syn,fin TCP flags urg,ack,psh,rst,syn,fin ASR = Attack Severity rating Info (25) Low (50) Med (75) High (100) TVR = Target Value rating Zero (50) Low (75) Med (100) High (150) Critical (200) SFR = Signature Fidelity rating (0-100) PD = Promiscuous delta (0-30) minus value ARR = Attack Relevancy Rating Relevant (10) unknown (0) Not relevant (-10) WLR = watch List rating (0-100) Event Action Overides Based on RR category Add actions Event Action Filters Based on RR category & others Delete actions

  2. Summary Key 0 60 secs TRAFFIC 1 XXXX AaBb 100 Matches = 100 alerts Aa=Attack Bb=Victim @60 sec Generate Summary 0 60 secs TRAFFIC 2 Uppercase=IP Lowercase=port 160 Matches = 150 alerts @60 sec Generate Global Summary 0 60 secs TRAFFIC 3 320 matches = 150 alerts Criteria Sig ID = 60000 Summary Mode: Fire All Summary Threshold: 150 Global Summary Threshold: 300 Summary Interval: 60

  3. TCP Header A U S F MASK = ASF Flags = SF 1 1

  4. False Positive = TOO SENSITIVE (Increase accuracy ../cmd.exe rather than ../) False Negative = INSENSITIVE (Decrease accuracy ../ rather than ../fred.txt/home/)

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