""ET TROJAN W32/Asprox CnC Beacon""

SID: 2016528

Revision: 4

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2013_03_05, deployment Perimeter, signature_severity Major, tag c2, updated_at 2014_05_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• Link

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: any

Flow: established,to_server

Contents:

• Value: "Mozilla/4.0 (compatible|3B| MSIE 6.0b|3B| Windows NT 5.0|3B| .NET CLR"

Within:

PCRE: "/^POST \x2F[a-f0-9]{40,60}\x20/i"

Special Options:

source