""ET TROJAN MSIL/Agent.PYO Possible net.tcp CnC Beacon (control)""

SID: 2020337

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_01_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_01_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: any

Flow: established,to_server

Contents:

  • Value: "net.tcp|3a|//" Depth: 10 Offset: 7

  • Value: "/control|03 08 0c|"

Within:

PCRE: "/^\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\x3a\d+\/control\x03\x08\x0c$/R"

Special Options:

source