""ET INFO Base64 Encoded Null Byte Padded File in HTML Body (Magic Bytes)""
SID: 2047791
Revision: 1
Class Type: misc-activity
Metadata: attack_target Client_Endpoint, created_at 2023_08_28, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag HTML_Smuggling, updated_at 2023_10_06, reviewed_at 2023_08_28, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information
Reference:
Protocol: tcp
Source Network: $EXTERNAL_NET
Source Port: $HTTP_PORTS
Destination Network: $HOME_NET
Destination Port: any
Flow: established,to_client
Contents:
-
Value: "data|3a|"
-
Value: "base64,AAAAAAAA"
Within: 65
PCRE:
Special Options:
-
file_data
-
nocase
-
fast_pattern