MalwareRansomwareUsed by 1 actor

UnknownKiller

For your environment

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THREAT ACTORS

Groups observed using it

1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

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Gentlemen

Gentlemen adapts newly published Bring Your Own Vulnerable Driver proofs-of-concept quickly. The operators folded two recently disclosed examples, tracked as UnknownKiller and PoisonKiller, into their tooling within days of release.

via help net securityhelpnetsecurity.com

MITRE ATT&CK

Techniques & procedures

4 distinct techniques documented for this family, organized by ATT&CK tactic.

Privilege Escalation

1 technique

T1068Exploitation for Privilege EscalationEvidence1

unknown.sys is an unattributed signed kernel driver documented in public UnknownKiller / BlackSnufkin BYOVD research. The public PoCs identify the driver as exposing a process-kill primitive suitable for BYOVD process termination research.

Stealth

1 technique

T1211Exploitation for Defense EvasionEvidence1

GentleKiller... appears in at least eight variants, each one impersonating a different legitimate product and abusing a different vulnerable or malicious kernel driver. ... Gentlemen adapts newly published Bring Your Own Vulnerable Driver proofs-of-concept quickly.

Impact

1 technique

T1489Service StopEvidence1

Use Case Privileges Operating System Terminate processes from kernel mode through an unattributed vulnerable driver.

Other

1 technique

T1562Impair DefensesEvidence1

Its operators develop and maintain a set of tools for shutting down endpoint detection and response (EDR) products, then provide these tools directly to the affiliates who rent the gang’s encryptors.

INDICATORS OF COMPROMISE

IOCs tracked for this family

13 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.

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Hashes

13 tracked

File hashes (MD5, SHA-1, SHA-256) from samples and reports.

TypeValueLatest sighting

hash.md5●●●●●●●●●●●●View more in app2 days ago

hash.sha1●●●●●●●●●●●●View more in app2 days ago

ACTIVITY FEED

Recent activity

1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

1 SOURCESView more in app

help net securityNews

Jun 18, 2026

GentleKiller targets more than 400 security processes across 48 products - Help Net Security

A recently disclosed Bring Your Own Vulnerable Driver proof-of-concept that Gentlemen incorporated into its EDR-killer tooling.

What this page doesn’t show

The version that knows your environment.

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IOC matching13

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution1

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

MITRE ATT&CK mapping4

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.