""ET TROJAN Observed Malicious SSL/TLS Certificate (SilentLibrarian)""

SID: 2037075

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_and_Server, created_at 2022_06_22, deployment Perimeter, performance_impact Low, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2022_06_22, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: 443

Destination Network: $HOME_NET

Destination Port: any

Flow: from_server,established

Contents:

• Value: "|16|"

• Value: "|0b|"

• Value: ".unnit.me"

Within: 8

PCRE:

Special Options:

• fast_pattern

source