Open Redirect: emlakarsa

 1name: "Open Redirect: emlakarsa"
 2description: |
 3    Message contains use of the emlakarsa open redirect. This has been exploited in the wild.
 4type: "rule"
 5severity: "medium"
 6source: |
 7  type.inbound
 8  and any(body.links,
 9    .href_url.domain.root_domain == "emlakarsa.net"
10    and strings.icontains(.href_url.query_params, "_setLang")
11    and strings.icontains(.href_url.query_params, "redirect=")
12  )
13  and sender.email.domain.root_domain != 'emlakarsa.net'
14  and (
15    not profile.by_sender().solicited
16    or (
17      profile.by_sender().any_messages_malicious_or_spam
18      and not profile.by_sender().any_false_positives
19    )
20  )
21  
22  // negate highly trusted sender domains unless they fail DMARC authentication
23  and (
24    (
25      sender.email.domain.root_domain in $high_trust_sender_root_domains
26      and not headers.auth_summary.dmarc.pass
27    )
28    or sender.email.domain.root_domain not in $high_trust_sender_root_domains
29  )  
30attack_types:
31  - "Credential Phishing"
32  - "Malware/Ransomware"
33tactics_and_techniques:
34  - "Open redirect"
35detection_methods:
36  - "Sender analysis"
37  - "URL analysis"
38id: "ce5d5b63-ed78-50b6-a996-f7d7f01e7517"