ThreatFox: Unknown malware IOCs

Hunt Hypothesis

This hunt detects adversary behavior characterized by the presence of fifteen distinct indicators of compromise (IOCs) linked to previously unidentified malware strains within the Azure Sentinel environment. Proactively hunting for these unknown threats is critical to enable early detection and rapid containment before the malware can establish persistence or propagate laterally across the organization’s cloud infrastructure.

IOC Summary

Malware Family: Unknown malware Total IOCs: 15 IOC Types: url, ip:port, domain

Type	Value	Threat Type	First Seen	Confidence
ip:port	`152[.]228[.]249[.]243:443`	botnet_cc	2026-07-31	50%
url	`hxxps://qyvbm.fun/api/command`	botnet_cc	2026-07-31	50%
domain	`qyvbm.fun`	botnet_cc	2026-07-31	50%
ip:port	`217[.]60[.]11[.]126:443`	botnet_cc	2026-07-31	50%
ip:port	`188[.]166[.]238[.]207:7443`	botnet_cc	2026-07-31	100%
ip:port	`77[.]110[.]127[.]186:443`	payload_delivery	2026-07-31	100%
domain	`hairpi9911.icu`	payload_delivery	2026-07-31	100%
ip:port	`95[.]133[.]166[.]43:7443`	botnet_cc	2026-07-31	75%
domain	`www.contratoscliente.online`	payload_delivery	2026-07-31	100%
domain	`fosterandfunnel.com`	payload_delivery	2026-07-31	75%
domain	`awantunai.co.id`	payload_delivery	2026-07-31	75%
ip:port	`114[.]66[.]58[.]253:3232`	botnet_cc	2026-07-31	100%
ip:port	`114[.]66[.]58[.]253:8889`	botnet_cc	2026-07-31	100%
ip:port	`114[.]66[.]58[.]253:22`	botnet_cc	2026-07-31	100%
ip:port	`114[.]66[.]58[.]253:80`	botnet_cc	2026-07-31	100%

KQL: Ip Hunt

// Hunt for network connections to known malicious IPs
// Source: ThreatFox - Unknown malware
let malicious_ips = dynamic(["188.166.238.207", "77.110.127.186", "95.133.166.43", "114.66.58.253", "217.60.11.126", "152.228.249.243"]);
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(["188.166.238.207", "77.110.127.186", "95.133.166.43", "114.66.58.253", "217.60.11.126", "152.228.249.243"]);
DeviceNetworkEvents
| where RemoteIP in (malicious_ips)
| project Timestamp, DeviceName, RemoteIP, RemotePort, InitiatingProcessFileName, ActionType
| order by Timestamp desc

KQL: Domain Hunt

// Hunt for DNS queries to known malicious domains
// Source: ThreatFox - Unknown malware
let malicious_domains = dynamic(["qyvbm.fun", "hairpi9911.icu", "www.contratoscliente.online", "fosterandfunnel.com", "awantunai.co.id"]);
DnsEvents
| where Name has_any (malicious_domains)
| project TimeGenerated, Computer, Name, IPAddresses, QueryType
| order by TimeGenerated desc

KQL: Url Hunt

// Hunt for access to known malicious URLs
// Source: ThreatFox - Unknown malware
let malicious_urls = dynamic(["https://qyvbm.fun/api/command"]);
UrlClickEvents
| where Url has_any (malicious_urls)
| project Timestamp, AccountUpn, Url, ActionType, IsClickedThrough
| order by Timestamp desc

Required Data Sources

Sentinel Table	Notes
`CommonSecurityLog`	Ensure this data connector is enabled
`DeviceNetworkEvents`	Ensure this data connector is enabled
`DnsEvents`	Ensure this data connector is enabled
`UrlClickEvents`	Ensure this data connector is enabled

References

ThreatFox — Unknown malware

False Positive Guidance

Here are specific false positive scenarios and corresponding filters for the ThreatFox: Unknown malware IOCs detection rule in an enterprise environment:

Scenario: Automated Endpoint Protection Scans generating high-volume network traffic.
- Context: Scheduled maintenance windows where tools like Microsoft Defender for Endpoint, CrowdStrike Falcon, or Symantec Endpoint Protection perform full-system scans and upload telemetry to their cloud management consoles. These scans often generate connections to unknown IOCs (hashes, URLs) that the rule flags as “unknown” because they are part of a dynamic update cycle not yet in the global whitelist.
- Suggested Filter: Exclude traffic originating from specific Service Accounts (e.g., svc-antivirus-scan) or restrict alerts to only trigger when the source process is not one of the known AV executables (e.g., MsMpEng.exe, FalconSensor.exe).
Scenario: Legitimate Software Deployment via Configuration Management Tools.
- Context: Automated patching and application deployment jobs running via Microsoft SCCM, Ansible, or Jenkins pipelines. These tools frequently download new installer packages, scripts, or dependencies from internal repositories or public CDNs (like GitHub Actions artifacts) that have recently changed hashes, triggering the “Unknown” status before they are fully cataloged in the threat intelligence feed.
- Suggested Filter: Create an exclusion for traffic where the Source Process Name matches known deployment agents (e.g., ccmexec.exe, ansible-runner) and the destination IP range falls within the enterprise’s internal Software Distribution Network or trusted CDN subnets.
Scenario: Developer Workstations executing CI/CD Artifacts.
- Context: Developers on engineering workstations running local builds, Docker containers, or unit tests that pull dependencies from private registries (