""ET TROJAN Observed Malicious SSL Cert (JS/Ostap CnC)""

SID: 2030602

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2020_07_28, deployment Perimeter, malware_family Ostap, performance_impact Low, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2020_07_28, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol

Reference:

  • md5

  • f5cf9ca73dd30caf43d75dd19240a79e

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: 443

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "|55 04 03|"

  • Value: "|16|pro100zver.mskhost.pro"

Within: 23

PCRE:

Special Options:

  • fast_pattern

source