""ET WEB_CLIENT Possible Embedded NTLM Hash Theft Code""

SID: 2029329

Revision: 3

Class Type: attempted-user

Metadata: attack_target Client_Endpoint, created_at 2020_01_29, deployment Perimeter, signature_severity Minor, updated_at 2023_10_11, reviewed_at 2024_04_30

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "src=file|3a 2f 2f 2f 5c 5c|"

  • Value: "|5f|C$|5f|"

  • Value: "visibility|3a|"

  • Value: "hidden"

  • Value: "src="

Within: 8

PCRE: "/^\s[\x22\x27]\sfile\x3a\x2f\x2f\x2f\x5c\x5c[^\x20]+\x5cC\$\x5c\s*[\x22\x27]/Rsi"

Special Options:

  • file_data

  • nocase

  • fast_pattern

  • nocase

  • nocase

source