""ET TROJAN Win32/Ursnif Checkin""

SID: 2019377

Revision: 4

Class Type: trojan-activity

Metadata: created_at 2014_10_09, updated_at 2015_04_03

Reference:

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: "|0d 0a|Content-Length|3a 20|2|0d 0a|Connection|3a 20|"

  • Value: !"Referer|3a|"

  • Value: "no-cache|0d 0a 0d 0a 0d 0a|"

Within:

PCRE: "/^(?:\/\w{3,12}){2,4}\?[a-z]{3,12}=(?:[A-Za-z0-9+/\x20]{4})*(?:[A-Za-z0-9+/\x20]{2}==|[A-Za-z0-9+/\x20]{3}=|[A-Za-z0-9+/\x20]{4})$/U"

Special Options:

  • http_method

  • http_header

  • http_header

source