1 malware family

H2OWATER

Also known ash2owaterh2owater_team

H2OWATER TeAm is the operator name associated with H2OWater, a low-prevalence ransomware family written in Go and observed in 2025. The malware encrypts victim data using a hybrid cryptographic scheme combining AES-256 in CTR mode with RSA-2048, appends a distinctive H2OWATER extension to encrypted files, and delivers an HTML ransom note demanding payment in cryptocurrency. The extortion message threatens disclosure or sale of stolen data if victims do not comply, indicating a double-extortion model in addition to file encryption. The operation appears oriented toward English-speaking victims and may have opportunistic global reach rather than a narrowly defined regional focus. Reported initial access and delivery vectors include exposed remote access services, spam campaigns with malicious attachments, deceptive downloads, exploit-driven compromise, malvertising, web injects, fake software updates, botnet-assisted delivery, and trojanized installers. These behaviors support assessment of capabilities spanning initial access, defense evasion, and post-compromise extortion. Available information does not support attribution to a nation-state or a specific country of origin at high confidence.

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MITRE ATT&CK

Tradecraft

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

1 of 15 tactics1 techniques×N= number of intelligence reports citing this technique

MITRE ATT&CK

TA0040

Impact

1 technique

T1486

Data Encrypted for Impact

ARSENAL

Associated malware families

1 malware family attributed to this actor across reporting.

FamilyContextEvidenceLast seen

H2OWaterH2OWater Ransomware ... Этот крипто-вымогатель шифрует данные пользователей с помощью комбинации алгоритмов AES-256 CTR и RSA-2048, а затем требует выкуп $5000 в USDT, чтобы расшифровать файлы. Оригинальное название: H2OWater.1Apr 11, 2026

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

id ransomware blogNews

Jul 1, 2016

Шифровальщики-вымогатели The Digest "Crypto-Ransomware": H2OWater

Ransomware operators behind H2OWater, a Go-based crypto-ransomware that encrypts files with AES-256 CTR and RSA-2048 and demands a $5000 USDT ransom.

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Target overlap

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Tradecraft mapping1

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

Malware arsenal1

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

Exploited CVEs

CVEs this actor has used in known campaigns.

Detection signatures

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Observables

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

H2OWATER

Also known ash2owaterh2owater_team