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ThreatFox: Mirai IOCs

ioc-hunt HIGH ThreatFox
CommonSecurityLogDeviceFileEventsDeviceNetworkEventsUrlClickEvents
elf-miraiiocthreatfox
This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at ThreatFox →
Retrieved: 2026-07-19T11:00:00Z · Confidence: high

Hunt Hypothesis

This hunt targets Mirai malware infections by identifying IoT devices exhibiting anomalous outbound traffic to known malicious IP:port pairs and C2 URLs, indicative of compromised default credentials or weak configurations. Proactively hunting for these indicators in Azure Sentinel is critical to detect early-stage botnet recruitment before adversaries leverage the infected infrastructure to launch large-scale DDoS attacks against the organization.

IOC Summary

Malware Family: Mirai Total IOCs: 34 IOC Types: ip:port, sha256_hash, url

TypeValueThreat TypeFirst SeenConfidence
ip:port103[.]83[.]87[.]122:80botnet_cc2026-07-19100%
ip:port103[.]83[.]87[.]122:2222botnet_cc2026-07-19100%
ip:port103[.]83[.]87[.]122:4444botnet_cc2026-07-19100%
ip:port103[.]83[.]87[.]122:8060botnet_cc2026-07-19100%
ip:port103[.]83[.]87[.]122:4444payload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/telnet.shpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.x86_64payload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.aarch64payload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.m68kpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.mipspayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.mipselpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.powerpcpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.sparcpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.sh4payload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.arcpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.i486payload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.armv4lpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.armv5lpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.armv6lpayload_delivery2026-07-19100%
urlhxxp://103[.]83[.]87[.]122/iran.armv7lpayload_delivery2026-07-19100%
sha256_hashb1a6dba6636b519d76d7219f6264ac9f1456681c0855baef954fb435d3e25ce5payload2026-07-19100%
sha256_hashbf38b3e5d645c78377599a6c218a347312c5a3daef693c7931f2710806d85317payload2026-07-19100%
sha256_hashf5cb6dadaee4399a1f014ef5946d0a4c1af578d15ff078e725e0757f28dc8493payload2026-07-19100%
sha256_hashe987bb8b32facef51c3cc5a94bd51e01d8c3be8a19c106de70147ab5ce84dc66payload2026-07-19100%
sha256_hash6e709fb9b09d9f8318724a8620812f55411a3ea49de6319c4832885547773dddpayload2026-07-19100%

KQL: Ip Hunt

// Hunt for network connections to known malicious IPs
// Source: ThreatFox - Mirai
let malicious_ips = dynamic(["103.83.87.122"]);
CommonSecurityLog
| where DestinationIP in (malicious_ips) or SourceIP in (malicious_ips)
| project TimeGenerated, SourceIP, DestinationIP, DestinationPort, DeviceAction, Activity
| order by TimeGenerated desc

KQL: Ip Hunt Device

// Hunt in Defender for Endpoint network events
let malicious_ips = dynamic(["103.83.87.122"]);
DeviceNetworkEvents
| where RemoteIP in (malicious_ips)
| project Timestamp, DeviceName, RemoteIP, RemotePort, InitiatingProcessFileName, ActionType
| order by Timestamp desc

KQL: Url Hunt

// Hunt for access to known malicious URLs
// Source: ThreatFox - Mirai
let malicious_urls = dynamic(["http://103.83.87.122/telnet.sh", "http://103.83.87.122/iran.x86_64", "http://103.83.87.122/iran.aarch64", "http://103.83.87.122/iran.m68k", "http://103.83.87.122/iran.mips", "http://103.83.87.122/iran.mipsel", "http://103.83.87.122/iran.powerpc", "http://103.83.87.122/iran.sparc", "http://103.83.87.122/iran.sh4", "http://103.83.87.122/iran.arc", "http://103.83.87.122/iran.i486", "http://103.83.87.122/iran.armv4l", "http://103.83.87.122/iran.armv5l", "http://103.83.87.122/iran.armv6l", "http://103.83.87.122/iran.armv7l"]);
UrlClickEvents
| where Url has_any (malicious_urls)
| project Timestamp, AccountUpn, Url, ActionType, IsClickedThrough
| order by Timestamp desc

KQL: Hash Hunt

// Hunt for files matching known malicious hashes
// Source: ThreatFox - Mirai
let malicious_hashes = dynamic(["b1a6dba6636b519d76d7219f6264ac9f1456681c0855baef954fb435d3e25ce5", "bf38b3e5d645c78377599a6c218a347312c5a3daef693c7931f2710806d85317", "f5cb6dadaee4399a1f014ef5946d0a4c1af578d15ff078e725e0757f28dc8493", "e987bb8b32facef51c3cc5a94bd51e01d8c3be8a19c106de70147ab5ce84dc66", "6e709fb9b09d9f8318724a8620812f55411a3ea49de6319c4832885547773ddd", "0d64cd75599dea5b8cf393b6e2b709f51b3971e64b96920e0707020e22ee7953", "f38d748d9ea29424c28744c52bcd1d14328d49fcb604ca08fab3547ec500d6f0", "b4acd1ab65624b694946b1181bba0732bb63c88c51b8334914c26c1805b2e1aa", "21c5f4a04173a5176d60b06095bf5d25e0022ffbe304601e368eccf718587dc8", "ec442a132f27486d1dfa3faa92c03e10012afe2b8de39fa9b42b367f7971c989", "9538c8a2edeaa8667134a469d03a7057ddc1e753ce1e5250f92f01c1097fcb1d", "d8cd1d9f8c092aa4a6c1b1b2b97c7de71d55c2af8332532d2956e4f5becac17e", "95f5bd70c4e40f9663b67d40d23a46ca21d97448f9a609be10b12837e6a59805", "b1f2808e05cb42894790c12172ffacf8673a0a7e14c7af5ad43d5bedfa62a5e4"]);
DeviceFileEvents
| where SHA256 in (malicious_hashes) or SHA1 in (malicious_hashes) or MD5 in (malicious_hashes)
| project Timestamp, DeviceName, FileName, FolderPath, SHA256, InitiatingProcessFileName
| order by Timestamp desc

Required Data Sources

Sentinel TableNotes
CommonSecurityLogEnsure this data connector is enabled
DeviceFileEventsEnsure this data connector is enabled
DeviceNetworkEventsEnsure this data connector is enabled
UrlClickEventsEnsure this data connector is enabled

References

False Positive Guidance

Here are 4 specific false positive scenarios for the ThreatFox: Mirai IOCs detection rule in an enterprise environment, along with suggested filters or exclusions:

Original source: https://threatfox.abuse.ch/browse/malware/elf.mirai/