""ET TROJAN Observed Malicious SSL Cert (Cobalt Strike)""

SID: 2048311

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2023_09_27, deployment Perimeter, former_category MALWARE, malware_family Cobalt_Strike, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2023_09_27, reviewed_at 2023_10_27

Reference:

• md5

• 6bb06ab176ae723bc901126f59e9243d

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: 443

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

• Value: "|16|"

• Value: "|0b|"

• Value: "|06 03 55 04 06|"

• Value: "|02|DE"

• Value: "|06 03 55 04 07|"

• Value: "|07|Germany"

• Value: "|06 03 55 04 0a|"

• Value: "|11|Kaspersky AO Lab."

• Value: "|06 03 55 04 03|"

• Value: "|15|*.me-en.kaspersky.com"

Within: 22

PCRE:

Special Options:

• fast_pattern

source