""ET TROJAN PowerShell/Agent.A DNS File Transfer CnC Beacon""

SID: 2022837

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_05_24, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_08_28, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

Protocol: udp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: any

Flow:

Contents:

  • Value: "|01|" Depth: 1 Offset: 2

  • Value: "|00 01 00 00 00 00 00|"

  • Value: "00"

  • Value: "00000"

  • Value: "232A"

Within: 2

PCRE: "/^[0-9A-Z]+232A/R"

Special Options:

source