sublimemediumRule

Observed IOC: Mail transiting bulletproof host - SmartApe

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).

MITRE ATT&CK

T1566.001 T1204.002 T1486 T1566 T1566.002 T1598 T1534 T1656 T1036 T1027

defense-evasioninitial-access

Detection Query

type.inbound
and any(headers.ips,
        ip.in_range(.,
                    "31.177.108.0/22", // AS56694
                    "77.91.89.0/24", // AS56694
                    "91.219.148.0/22", // AS56694
                    "94.198.50.0/23", // AS56694
                    "94.198.52.0/22", // AS56694
                    "109.238.92.0/23", // AS56694
                    "152.89.216.0/22", // AS56694
                    "178.255.126.0/23", // AS56694
                    "185.9.144.0/22", // AS56694
                    "185.130.248.0/22", // AS56694
                    "185.217.128.0/24", // AS56694
                    "188.127.224.0/20", // AS56694
                    "188.127.240.0/22", // AS56694
                    "188.127.244.0/23", // AS56694
                    "188.127.248.0/22", // AS56694
                    "188.127.253.0/24", // AS56694
                    "188.127.254.0/23", // AS56694
                    "209.142.100.0/24", // AS56694
                    "213.171.16.0/21", // AS56694
                    "217.21.53.0/24", // AS56694
                    "2a06:dd00::/32", // AS56694
                    "2a0b:2d80::/32", // AS56694
                    "2a0e:fb42::/32", // AS56694
                    "2a0f:6fc5:3e84::/48", // AS56694
                    "2a0f:6fc5:a4ae::/48", // AS56694
                    "2a0f:8447::/32" // AS56694
        )
)

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

Raw Content

name: "Observed IOC: Mail transiting bulletproof host - SmartApe"
description: "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)."
type: "rule"
severity: "medium"
source: |
  type.inbound
  and any(headers.ips,
          ip.in_range(.,
                      "31.177.108.0/22", // AS56694
                      "77.91.89.0/24", // AS56694
                      "91.219.148.0/22", // AS56694
                      "94.198.50.0/23", // AS56694
                      "94.198.52.0/22", // AS56694
                      "109.238.92.0/23", // AS56694
                      "152.89.216.0/22", // AS56694
                      "178.255.126.0/23", // AS56694
                      "185.9.144.0/22", // AS56694
                      "185.130.248.0/22", // AS56694
                      "185.217.128.0/24", // AS56694
                      "188.127.224.0/20", // AS56694
                      "188.127.240.0/22", // AS56694
                      "188.127.244.0/23", // AS56694
                      "188.127.248.0/22", // AS56694
                      "188.127.253.0/24", // AS56694
                      "188.127.254.0/23", // AS56694
                      "209.142.100.0/24", // AS56694
                      "213.171.16.0/21", // AS56694
                      "217.21.53.0/24", // AS56694
                      "2a06:dd00::/32", // AS56694
                      "2a0b:2d80::/32", // AS56694
                      "2a0e:fb42::/32", // AS56694
                      "2a0f:6fc5:3e84::/48", // AS56694
                      "2a0f:6fc5:a4ae::/48", // AS56694
                      "2a0f:8447::/32" // AS56694
          )
  )
attack_types:
  - "Malware/Ransomware"
  - "Credential Phishing"
  - "BEC/Fraud"
tactics_and_techniques:
  - "Evasion"
  - "Social engineering"
detection_methods:
  - "Header analysis"
  - "Sender analysis"
id: "c618a080-57ac-5fc4-be61-d04db5b03ed5"