Observed IOC: Mail transiting bulletproof host - SmartApe

calendar Aug 27, 2026  ·
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Detects inbound mail whose IP space is announced by SmartApe (SmartApe LLC), a Russia-based hosting provider widely reported for abuse-tolerant / bulletproof hosting. IP ranges are the prefixes announced by SmartApe's ASN (AS56694).

Sublime rule (View on GitHub)

 1name: "Observed IOC: Mail transiting bulletproof host - SmartApe"
 2description: "Detects inbound mail whose IP space is announced by SmartApe (SmartApe LLC), a Russia-based hosting provider widely reported for abuse-tolerant / bulletproof hosting. IP ranges are the prefixes announced by SmartApe's ASN (AS56694)."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(headers.ips,
 8          //
 9          // This rule makes use of a beta feature and is subject to change without notice
10          // using the beta feature in custom rules is not suggested until it has been formally released
11          //
12          beta.ip_in(.ip,
13                     "31.177.108.0/22", // AS56694
14                     "77.91.89.0/24", // AS56694
15                     "91.219.148.0/22", // AS56694
16                     "94.198.50.0/23", // AS56694
17                     "94.198.52.0/22", // AS56694
18                     "109.238.92.0/23", // AS56694
19                     "152.89.216.0/22", // AS56694
20                     "178.255.126.0/23", // AS56694
21                     "185.9.144.0/22", // AS56694
22                     "185.130.248.0/22", // AS56694
23                     "185.217.128.0/24", // AS56694
24                     "188.127.224.0/20", // AS56694
25                     "188.127.240.0/22", // AS56694
26                     "188.127.244.0/23", // AS56694
27                     "188.127.248.0/22", // AS56694
28                     "188.127.253.0/24", // AS56694
29                     "188.127.254.0/23", // AS56694
30                     "209.142.100.0/24", // AS56694
31                     "213.171.16.0/21", // AS56694
32                     "217.21.53.0/24", // AS56694
33                     "2a06:dd00::/32", // AS56694
34                     "2a0b:2d80::/32", // AS56694
35                     "2a0e:fb42::/32", // AS56694
36                     "2a0f:6fc5:3e84::/48", // AS56694
37                     "2a0f:6fc5:a4ae::/48", // AS56694
38                     "2a0f:8447::/32" // AS56694
39          )
40  )  
41attack_types:
42  - "Malware/Ransomware"
43  - "Credential Phishing"
44  - "BEC/Fraud"
45tactics_and_techniques:
46  - "Evasion"
47  - "Social engineering"
48detection_methods:
49  - "Header analysis"
50  - "Sender analysis"
51id: "c618a080-57ac-5fc4-be61-d04db5b03ed5"
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