""ET TROJAN Observed Ursnif Domain in TLS SNI (prises .cyou)""
SID: 2039668
Revision: 1
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2022_11_02, deployment Perimeter, malware_family ursnif, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2022_11_02
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: 443
Flow: established,to_server
Contents:
-
Value: "|16|"
-
Value: "|01|"
-
Value: "|00 00 0b|prises.cyou"
Within: 8
PCRE:
Special Options:
- fast_pattern