MalwareRansomwareUsed by 1 actor

PoisonKiller

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

Tools such as UnknownKiller and PoisonKiller were incorporated into GentleKiller’s arsenal within days of their public GitHub disclosure, demonstrating a well-resourced and agile development pipeline.

via cyber security newscybersecuritynews.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 EscalationEvidence3

The technique used is Bring Your Own Vulnerable Driver (BYOVD), loading a legitimately signed but exploitable driver to terminate security processes at the kernel level, bypassing user-mode protections.

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

Specifically, the IOCTL code 0x22E010 triggers a dedicated process-killing routine... It uses the ZwOpenProcess and ZwTerminateProcess kernel functions to terminate active applications forcibly.

Other

1 technique

T1562Impair DefensesEvidence3

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

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

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Hashes

1 tracked

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

TypeValueLatest sighting

hash.sha256●●●●●●●●●●●●View more in app2 months ago

ACTIVITY FEED

Recent activity

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

4 SOURCESView more in app

cyber security newsNews

Jun 21, 2026

GentleKiller Ransomware Abuses Vulnerable Drivers to Disable 400+ EDR Security Processes

A publicly disclosed EDR-killing/BYOVD tool whose techniques or components were rapidly incorporated into GentleKiller’s arsenal.

security affairsNews

Jun 20, 2026

Inside GentleKiller: The EDR-Killer Powering The Gentlemen

A publicly disclosed EDR-killer proof-of-concept that The Gentlemen rapidly adopted into their toolset.

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.

huntress blogNews

Apr 17, 2026

Uptick in Bomgar RMM Exploitation | Huntress

A BYOVD tool designed to disable or terminate EDR agents, referenced through the related PoisonX.sys driver.

What this page doesn’t show

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IOC matching1

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.