""ET SHELLCODE Unescape Hex Obfuscated Content""

SID: 2013272

Revision: 3

Class Type: shellcode-detect

Metadata: created_at 2011_07_14, performance_impact Significant, updated_at 2024_04_09, 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: "unescape|28|"

  • Value: "|5C|x"

  • Value: "|5C|x"

  • Value: "|5C|x"

  • Value: "|5C|x"

Within: 2

PCRE: "/unescape\x28(\x22|\x27)\x5Cx[a-f,0-9]{2}\x5Cx[a-f,0-9]{2}\x5Cx[a-f,0-9]{2}/smi"

Special Options:

  • fast_pattern

source