External DNS 127.0.0.1 response

[James Lay <jlay () slave-tothe-box net>]

Bot suspension technique:

alert udp $EXTERNAL_NET 53 -> $DNS_SERVERS any (msg:"INDICATOR-COMPROMISE External DNS 127.0.0.1 response, possible bot 
suspension"; flow:from_server; content:"127.0.0.1"; fast_pattern:only; metadata:impact_flag red, service dns; 
classtype:trojan-activity; sid:10000048; rev:1;)

James
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