S0617: HELLOKITTY
HELLOKITTY is a ransomware written in C++ that shares similar code structure and functionality with DEATHRANSOM and FIVEHANDS. HELLOKITTY has been used since at least 2020, targets have included a Polish video game developer and a Brazilian electric power company.[1]
Security context for executives and security teams
S0617: HELLOKITTY describes [HELLOKITTY](https://attack.mitre.org/software/S0617) is a ransomware written in C++ that shares similar code structure and functionality with [DEATHRANSOM](https://attack.mitre.org/software/S0616) and [FIVEHANDS](https://attack.mitre.org/software/S0618). [HELLOKITTY](https://attack.mitre.org/software/S0617) has been used since at least 2020, targets have included a Polish video game developer and a Brazilian electric power company.(Citation: FireEye FiveHands April 2021)
Executive priority
S0617: HELLOKITTY is an official MITRE ATT&CK software. Glexia treats it as defensive behavior context for prioritizing monitoring, control validation, and response planning without using the object by itself as an attribution claim.
Technical view
Security teams should validate S0617: HELLOKITTY by reviewing the official ATT&CK relationships, mapped tactics (the mapped ATT&CK tactic context), supported platforms (Windows), and available local telemetry before making detection or mitigation decisions.
Likely telemetry
- Official ATT&CK relationships and object metadata
- Network, endpoint, and security-tool telemetry
Detection direction
- Validate whether S0617: HELLOKITTY appears in your detection coverage and tabletop scenarios.
- Use the object to align executive risk language with SOC, incident response, and detection engineering work.
- Do not treat ATT&CK relationship context as attribution without corroborating evidence.
Mitigation priorities
- Map the object to existing controls and identify missing telemetry or response ownership.
- Prioritize mitigations that reduce exposure on the listed platforms and tactics.
- Review adjacent ATT&CK relationships before changing policy, detections, or reporting language.
Additional notes and limits
Baseline Glexia take generated from the official MITRE ATT&CK STIX object, source hash, tactics, platforms, and detection fields. It is safe to replace with a richer model-generated take for the same source hash later.
This baseline take is source-grounded and schema-validated, but it does not include environment-specific telemetry, incident evidence, or threat-intelligence corroboration.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
HELLOKITTY
HELLOKITTY is a ransomware written in C++ that shares similar code structure and functionality with DEATHRANSOM and FIVEHANDS. HELLOKITTY has been used since at least 2020, targets have included a Polish video game developer and a Brazilian electric power company.[1]
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
Techniques used
This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1486 | Data Encrypted for Impact | HELLOKITTY can use an embedded RSA-2048 public key to encrypt victim data for ransom.[1] |
| Enterprise | T1490 | Inhibit System Recovery | HELLOKITTY can delete volume shadow copies on compromised hosts.[1] |
| Enterprise | T1135 | Network Share Discovery | HELLOKITTY has the ability to enumerate network resources.[1] |
| Enterprise | T1047 | Windows Management Instrumentation | HELLOKITTY can use WMI to delete volume shadow copies.[1] |
| Enterprise | T1680 | Local Storage Discovery | HELLOKITTY can enumerate logical drives on a target system.[1] |
| Enterprise | T1057 | Process Discovery | HELLOKITTY can search for specific processes to terminate.[1] |
All related ATT&CK context
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates.
Imported snapshots across ATT&CK releases(3)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 20.0 | 1.0 | Older bundle | d9842bc05cbc… | ||
| 19.2 | 1.0 | Current bundle | d9842bc05cbc… | ||
| 19.1 | 1.0 | Older bundle | d9842bc05cbc… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
- [1]FireEye FiveHands April 2021
McLellan, T. and Moore, J. et al. (2021, April 29). UNC2447 SOMBRAT and FIVEHANDS Ransomware: A Sophisticated Financial Threat. Retrieved June 2, 2021.
Open source URL - [2]mitre-attackS0617Open source URL
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