2 malware familiesExploits CVEs in the wild

phantom_mantis

Also known asphantom_mantis

Phantom Mantis, also referred to as ArmCorp, is a ransomware-related threat actor. The provided content states that it is led by LARVA-368, also known as hastalamuerte. Before building its own ransomware-as-a-service (RaaS) operation called The Gentlemen, Phantom Mantis tested multiple ransomware families, including Qilin (Pestilent Mantis), Embargo (Primeval Mantis), LockBit (Tenacious Mantis), Medusa (Venomous Mantis), and BlackLock (Incredible Mantis). Known aliases directly mentioned in the content are Phantom Mantis and ArmCorp.

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MITRE ATT&CK

Tradecraft

9 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.

8 of 15 tactics11 techniques×N= number of intelligence reports citing this technique

MITRE ATT&CK

TA0001

Initial Access

2 techniques

T1078

Valid Accounts

T1190

Exploit Public-Facing Application

TA0003

Persistence

1 technique

T1078

Valid Accounts

TA0004

Privilege Escalation

2 techniques

T1078

Valid Accounts

T1548

Abuse Elevation Control Mechanism

TA0005

Stealth

1 technique

T1078

Valid Accounts

TA0006

Credential Access

1 technique

T1649

Steal or Forge Authentication Certificates

TA0007

Discovery

2 techniques

T1018

Remote System Discovery

T1135

Network Share Discovery

TA0011

Command and Control

1 technique

T1071

Application Layer Protocol

TA0040

Impact

1 technique

T1486

Data Encrypted for Impact

ARSENAL

Associated malware families

2 malware families attributed to this actor across reporting.

FamilyContextEvidenceLast seen

QilinThe financially motivated threat group initially operated as an affiliate responsible for conducting double extortion attacks, while leveraging resources from various ransomware-as-a-service (RaaS) schemes like LockBit (aka Tenacious Mantis), Qilin (aka Pestilent Mantis), and Medusa (aka Venomous Mantis).1Jun 11, 2026

The GentlemenIn an analysis of the ransomware in late last year, LevelBlue's Cybereason team described The Gentlemen as a "highly adaptive, fast-moving ransomware operation" that combines mature ransomware techniques with RaaS features, double extortion, cross-platform lockers, and flexible propagation, and affiliate support.1Jun 11, 2026

WEAPONIZED

Associated vulnerabilities

3 CVEs this actor has used in observed campaigns. 3 of them exploited in the wild.

CVE-2024-55591Authentication Bypass in FortiOS and FortiProxy Node.js WebSocket ModuleIn the wildEvidence1

The group actively tracks and evaluates modern vulnerabilities, including CVE-2024-55591, CVE-2025-32433, and CVE-2025-33073, and combines them with technique-driven paths like backup and management-controller abuse and NTLM relay workflows, giving them a flexible exploitation pipeline.

CVE-2025-32433Unauthenticated RCE in Erlang/OTP SSH ServerIn the wildEvidence1

CVE-2025-33073Windows SMB Client Elevation of Privilege VulnerabilityIn the wildEvidence1

IOCS

Observables

1 indicator attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.

1 IOCsView more in app

IOC values are gated. View more in Mallory for domains, IPs, hashes, and other artifacts, or pipe them straight into your SIEM.

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

the hacker newsNews

Dec 15, 2025

⚡ Weekly Recap: Apple 0-Days, WinRAR Exploit, LastPass Fines, .NET RCE, OAuth Scams & More

Phantom Mantis is a cybercrime group that tested various ransomware strains before developing The Gentlemen RaaS.

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Target overlap

Match sector + geo + tech-stack targeting against your real footprint.

Tradecraft mapping9

Every observed MITRE ATT&CK technique, grouped by tactic.

Malware arsenal2

Families this actor is known to deploy, with IOCs and behavior.

Exploited CVEs3

CVEs this actor has used in known campaigns.

Detection signatures

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

Observables1

Domains, IPs, and hashes tied to this actor, refreshed continuously.