alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Suspicious Empty SSL Certificate - Observed in Cobalt Strike"; flow:from_server,established; content:"|55 04 06 13 00|"; fast_pattern; content:"|16|"; content:"|02|"; distance:0; within:8; content:"|55 04 06|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 08|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 07|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0a|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0b|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 03|"; distance:0; content:"|00|"; distance:1; within:2; metadata: former_category INFO; classtype:trojan-activity; sid:2023629; rev:3; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2016_10_24, performance_impact Low, updated_at 2019_10_07;)

Added 2019-10-09 19:08:54 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Suspicious Empty SSL Certificate - Observed in Cobalt Strike"; flow:from_server,established; content:"|55 04 06 13 00|"; fast_pattern; content:"|16|"; content:"|02|"; distance:0; within:8; content:"|55 04 06|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 08|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 07|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0a|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0b|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 03|"; distance:0; content:"|00|"; distance:1; within:2; classtype:trojan-activity; sid:2023629; rev:3; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2016_10_24, performance_impact Low, updated_at 2019_10_07;)

Added 2019-10-08 19:34:42 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Suspicious Empty SSL Certificate - Observed in Cobalt Strike"; flow:from_server,established; content:"|55 04 06 13 00|"; fast_pattern:only; content:"|16|"; content:"|02|"; distance:0; within:8; content:"|55 04 06|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 08|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 07|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0a|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0b|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 03|"; distance:0; content:"|00|"; distance:1; within:2; classtype:trojan-activity; sid:2023629; rev:2; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2016_10_24, performance_impact Low, updated_at 2016_12_13;)

Added 2018-09-13 19:53:14 UTC


Added 2018-09-13 18:01:18 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Suspicious Empty SSL Certificate - Observed in Cobalt Strike"; flow:from_server,established; content:"|55 04 06 13 00|"; fast_pattern:only; content:"|16|"; content:"|02|"; distance:0; within:8; content:"|55 04 06|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 08|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 07|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0a|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0b|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 03|"; distance:0; content:"|00|"; distance:1; within:2; classtype:trojan-activity; sid:2023629; rev:2; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2016_10_24, performance_impact Low, updated_at 2016_12_13;)

Added 2017-08-07 21:18:49 UTC


alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Suspicious Empty SSL Certificate - Observed in Cobalt Strike"; flow:from_server,established; content:"|55 04 06 13 00|"; fast_pattern:only; content:"|16|"; content:"|02|"; distance:0; within:8; content:"|55 04 06|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 08|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 07|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0a|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 0b|"; distance:0; content:"|00|"; distance:1; within:2; content:"|55 04 03|"; distance:0; content:"|00|"; distance:1; within:2; classtype:trojan-activity; sid:2023629; rev:2;)

Added 2016-12-13 17:30:19 UTC


Topic revision: r1 - 2019-10-09 - TWikiGuest
 
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