Open Redirect: asemailmgmteu.com

 1name: "Open Redirect: asemailmgmteu.com"
 2description: "Message contains use of the asemailmgmteu.com open redirect. This has been exploited in the wild."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and 0 < length(body.links) < 10
 8  and any(body.links,
 9          .href_url.domain.root_domain == "asemailmgmteu.com"
10          and strings.icontains(.href_url.query_params, 'redirect=')
11           and .display_text != "unsubscribe"
12          // negate use of the redirect by asemailmgmteu.com
13          and not any(.href_url.query_params_decoded["redirect"],
14                      strings.parse_url(.).domain.root_domain == sender.email.domain.root_domain
15                      or strings.parse_url(.).domain.root_domain == "asemailmgmteu.com"
16          )
17  )
18  // negate highly trusted sender domains unless they fail DMARC authentication
19  and (
20    (
21      sender.email.domain.root_domain in $high_trust_sender_root_domains
22      and not headers.auth_summary.dmarc.pass
23    )
24    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
25  )  
26
27attack_types:
28  - "Credential Phishing"
29  - "Malware/Ransomware"
30tactics_and_techniques:
31  - "Open redirect"
32detection_methods:
33  - "Sender analysis"
34  - "URL analysis"
35id: "368871ea-5b78-5507-a873-8a66aa346cce"