""ET TROJAN FormBook CnC Checkin (POST) M2""

SID: 2031413

Revision: 3

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_16, deployment Perimeter, signature_severity Major, updated_at 2021_02_03

Reference:

  • md5

  • 6f5d2b42f4a74886ac3284fa9a414a87

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: !"?"

  • Value: !"&"

  • Value: "="

  • Value: "|00 00 00 00 00 00|"

  • Value: "Accept|3a 20|gzip, deflate|0d 0a|"

  • Value: "Connection|3a 20|close|0d 0a|"

Within: 15

PCRE: "/^Host\x3a\x20[^\r\n]+\r\nConnection\x3a\x20[^\r\n]+\r\nContent-Length\x3a\x20[^\r\n]+\r\n/Hi"

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_uri

  • http_client_body

  • http_client_body

  • fast_pattern

  • http_header

  • http_header

source