Removed rule. This rule is known, but it is no longer present in its source. Showing the last known version.Removed: Jul 5, 2026, 4:07 AM
THL CovertVPN ICMP Tunnel Oversized Payload with Data or Keepalive Marker
alert icmp $HOME_NET any -> $EXTERNAL_NET any (msg:"THL CovertVPN ICMP Tunnel Oversized Payload with Data or Keepalive Marker"; itype:8; dsize:>128; byte_test:1,=,0xDD,4 ; threshold:type limit,track by_src,count 5,seconds 60 ; sid:1900040; rev:1; metadata:affected_product Windows, attack_target Client_Endpoint, created_at 2026_04_08, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2026_04_08;)
Metadata
affected productWindows
attack targetClient_Endpoint
created at2026_04_08
deploymentPerimeter
performance impactLow
signature severityMajor
updated at2026_04_08
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