""ET TROJAN CobaltStrike DNS Beacon Response""

SID: 2026040

Revision: 8

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_08_28, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, tag c2, updated_at 2022_03_05, 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: $EXTERNAL_NET

Source Port: 53

Destination Network: $HOME_NET

Destination Port: any

Flow:

Contents:

  • Value: "|81 80 00 01 00 01 00 00 00 00|" Depth: 10 Offset: 2

  • Value: "|c0 0c 00 01 00 01 00 00 00 00 00 04 00 00 00 00|"

  • Value: !"|06|nessus|03|org"

  • Value: !"trr|03|dns|07|nextdns|02|io"

  • Value: !"|08|cloudapp|03|net"

Within:

PCRE:

Special Options:

source