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ThreatFox: Unknown Loader IOCs

ioc-hunt HIGH ThreatFox
DnsEvents
iocthreatfoxunknown_loader
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: 2026-08-27T23:00:00Z · Confidence: high

Hunt Hypothesis

This detection rule identifies potential adversary activity by monitoring Azure Sentinel logs for indicators of compromise linked to the Unknown Loader malware family. Proactively hunting for these specific IOCs is critical because Unknown Loader often serves as a stealthy initial access vector that can establish persistence and facilitate lateral movement before triggering broader alerts.

IOC Summary

Malware Family: Unknown Loader Total IOCs: 90 IOC Types: domain

TypeValueThreat TypeFirst SeenConfidence
domainbondijunction.physiopayload_delivery2026-08-27100%
domainborghettipharma.compayload_delivery2026-08-27100%
domainbossanovabeirut.compayload_delivery2026-08-27100%
domainbrado.fipayload_delivery2026-08-27100%
domainbraininjurysvcs.orgpayload_delivery2026-08-27100%
domainbronzemenfoundation.compayload_delivery2026-08-27100%
domainbsocial.czpayload_delivery2026-08-27100%
domainbucketmap.depayload_delivery2026-08-27100%
domainbuenpastor.espayload_delivery2026-08-27100%
domainc-story.compayload_delivery2026-08-27100%
domainbike-expert.plpayload_delivery2026-08-27100%
domainbimboombar.itpayload_delivery2026-08-27100%
domainbimot.eupayload_delivery2026-08-27100%
domainbinhussainliving.compayload_delivery2026-08-27100%
domainbitesized-academy.compayload_delivery2026-08-27100%
domainbkul.plpayload_delivery2026-08-27100%
domainblackriveraerospace.compayload_delivery2026-08-27100%
domainblanesurigoitia.compayload_delivery2026-08-27100%
domainblueprinttaxconsulting.compayload_delivery2026-08-27100%
domainboehlair.compayload_delivery2026-08-27100%
domainbeaconcommerce.copayload_delivery2026-08-27100%
domainbemexperiences.compayload_delivery2026-08-27100%
domainbepoint.depayload_delivery2026-08-27100%
domainberger.biopayload_delivery2026-08-27100%
domainbestilldestinations.compayload_delivery2026-08-27100%

KQL: Domain Hunt

// Hunt for DNS queries to known malicious domains
// Source: ThreatFox - Unknown Loader
let malicious_domains = dynamic(["bondijunction.physio", "borghettipharma.com", "bossanovabeirut.com", "brado.fi", "braininjurysvcs.org", "bronzemenfoundation.com", "bsocial.cz", "bucketmap.de", "buenpastor.es", "c-story.com", "bike-expert.pl", "bimboombar.it", "bimot.eu", "binhussainliving.com", "bitesized-academy.com", "bkul.pl", "blackriveraerospace.com", "blanesurigoitia.com", "blueprinttaxconsulting.com", "boehlair.com", "beaconcommerce.co", "bemexperiences.com", "bepoint.de", "berger.bio", "bestilldestinations.com", "bharatcharitra.com", "avincleanroom.com", "avsengineering.sg", "awosano-kureinladungen.de", "ayurvedaymas.com", "aztechaz.com", "babadagultra.com", "babkad.com", "baladeacheval.com", "baocaosu001.com", "battybettybooks.com", "atachem.biz", "atlassteeleg.com", "audleychaucer.com", "auge.pt", "augenopti-k-rieckhof.de", "automationtoolstore.com", "aux-chandelles.be", "aviationtech.pl", "arjenduinhouwer.nl", "armangroup.be", "artemis-studio.gr", "artesc.org", "artphotoua.shop", "asua.co.uk"]);
DnsEvents
| where Name has_any (malicious_domains)
| project TimeGenerated, Computer, Name, IPAddresses, QueryType
| order by TimeGenerated desc

Required Data Sources

Sentinel TableNotes
DnsEventsEnsure this data connector is enabled

References

False Positive Guidance

Here are 4 specific false positive scenarios for the ThreatFox: Unknown Loader IOCs rule, along with targeted filtering strategies:

Original source: https://threatfox.abuse.ch/browse/malware/unknown_loader/