""ET TROJAN Win32/Colibri Loader Activity""

SID: 2034049

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_29, deployment Perimeter, signature_severity Major, updated_at 2021_09_29

Reference:

  • md5

  • 9bf1574b794c7937cdbd12a9ff6fba76

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: ".php?type=check&uid="

  • Value: !"Mozilla"

  • Value: !"Opera"

  • Value: !"Safari"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/^User-Agent\x3a\x20[A-Za-z0-9]{16,32}\r\nHost\x3a\x20[^\r\n]+\r\n\r\n$/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

  • http_header

  • http_header

source