""ET CURRENT_EVENTS Successful IRS Phish 2016-01-23""

SID: 2032672

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2016_01_23, deployment Perimeter, signature_severity Critical, tag Phishing, updated_at 2017_10_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: to_client,established

Contents:

  • Value: "302"

  • Value: "|0d 0a|Content-Type|3a 20|text/html"

  • Value: "Location|3a 20|http"

  • Value: "irs.gov"

  • Value: "Location|3a 20|http"

Within:

PCRE: "/^(?:s)?\x3a\/\/[^\/]+irs.gov/Ri"

Special Options:

  • http_stat_code

  • http_header

  • nocase

  • http_header

  • http_header

  • nocase

  • fast_pattern

source