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_messages_benign
19    )
20  )
21  
22  // negate highly trusted sender domains unless they fail DMARC authentication
23  and not (
24    sender.email.domain.root_domain in $high_trust_sender_root_domains
25    and coalesce(headers.auth_summary.dmarc.pass, false)
26  )  
27attack_types:
28  - "Credential Phishing"
29  - "Malware/Ransomware"
30tactics_and_techniques:
31  - "Open redirect"
32detection_methods:
33  - "Sender analysis"
34  - "URL analysis"
35id: "ce5d5b63-ed78-50b6-a996-f7d7f01e7517"