""ET INFO Psiphon VPN Related Activity (POST)""

SID: 2037033

Revision: 1

Class Type: bad-unknown

Metadata: attack_target Client_Endpoint, created_at 2022_06_17, deployment Perimeter, performance_impact Moderate, signature_severity Informational, updated_at 2022_06_17

Reference:

  • md5

  • 912e361d280d881980caca25cd0b80d4

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/"

  • Value: "Content-Type|3a 20|application/octet-stream|0d 0a|"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/Content-Length[^\r\n]+\r\nContent-Type[^\r\n]+\r\nCookie[^\r\n]+\r\nAccept-Encoding[^\r\n]+\r\n\r\n$/Hm"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

source