S0583: Pysa

S0583: Pysa describes [Pysa](https://attack.mitre.org/software/S0583) is a ransomware that was first used in October 2018 and has been seen to target particularly high-value finance, government and healthcare organizations.(Citation: CERT-FR PYSA April 2020)

Executive priority

S0583: Pysa 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 S0583: Pysa 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 S0583: Pysa 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.

Official MITRE ATT&CK definition

Pysa

Pysa is a ransomware that was first used in October 2018 and has been seen to target particularly high-value finance, government and healthcare organizations.[1]

View the same entry on attack.mitre.org (MITRE-hosted reference; in-page links above use the Glexia ATT&CK library.)

Glexia analysis

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.

ATT&CK relationship table

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.

Filter related techniques16 rows

Domain	ID	Name	Relationship / procedure
Enterprise	T1016	System Network Configuration Discovery	Pysa can perform network reconnaissance using the Advanced IP Scanner tool.[1]
Enterprise	T1059.006	PythonSub-technique	Pysa has used Python scripts to deploy ransomware.[1]
Enterprise	T1552.001	Credentials In FilesSub-technique	Pysa has extracted credentials from the password database before encrypting the files.[1]
Enterprise	T1685	Disable or Modify Tools	Pysa has the capability to stop antivirus services and disable Windows Defender.[1]
Enterprise	T1059.001	PowerShellSub-technique	Pysa has used Powershell scripts to deploy its ransomware.[1]
Enterprise	T1486	Data Encrypted for Impact	Pysa has used RSA and AES-CBC encryption algorithm to encrypt a list of targeted file extensions.[1]
Enterprise	T1112	Modify Registry	Pysa has modified the registry key “SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System” and added the ransom note.[1]
Enterprise	T1021.001	Remote Desktop ProtocolSub-technique	Pysa has laterally moved using RDP connections.[1]
Enterprise	T1569.002	Service ExecutionSub-technique	Pysa has used PsExec to copy and execute the ransomware.[1]
Enterprise	T1003.001	LSASS MemorySub-technique	Pysa can perform OS credential dumping using Mimikatz.[1]
Enterprise	T1489	Service Stop	Pysa can stop services and processes.[1]
Enterprise	T1490	Inhibit System Recovery	Pysa has the functionality to delete shadow copies.[1]
Enterprise	T1036.005	Match Legitimate Resource Name or LocationSub-technique	Pysa has executed a malicious executable by naming it svchost.exe.[1]
Enterprise	T1110	Brute Force	Pysa has used brute force attempts against a central management console, as well as some Active Directory accounts.[1]
Enterprise	T1070.004	File DeletionSub-technique	Pysa has deleted batch files after execution. [1]
Enterprise	T1046	Network Service Discovery	Pysa can perform network reconnaissance using the Advanced Port Scanner tool.[1]

Relationship explorer

All related ATT&CK context

Change history

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.

ATT&CK release: 19.2
Object version: 1.0
Created: Mar 1, 2021, 19:44 UTC (UTC+00:00)
Modified: Apr 25, 2025, 14:44 UTC (UTC+00:00)
Raw hash: 1d1d5fc995263a57...

Imported snapshots across ATT&CK releases(2)

Release	Bundle imported	Object version	Modified	Status	Raw hash
19.2	Aug 6, 2026, 02:58 UTC (UTC+00:00)	1.0	Apr 25, 2025, 14:44 UTC (UTC+00:00)	Current bundle	`1d1d5fc99526…`
19.1	Jul 14, 2026, 09:14 UTC (UTC+00:00)	1.0	Apr 25, 2025, 14:44 UTC (UTC+00:00)	Older bundle	`1d1d5fc99526…`

Raw source

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.

Open mirrored raw JSON Open MITRE-hosted copy

Source references

External references and citations

MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.

[1]
CERT-FR PYSA April 2020
CERT-FR. (2020, April 1). ATTACKS INVOLVING THE MESPINOZA/PYSA RANSOMWARE. Retrieved March 1, 2021.
Open source URL
[2]
DFIR Pysa Nov 2020
THe DFIR Report. (2020, November 23). PYSA/Mespinoza Ransomware. Retrieved March 17, 2021.
Open source URL
[3]
Mespinoza
(Citation: CERT-FR PYSA April 2020)(Citation: DFIR Pysa Nov 2020)(Citation: NHS Digital Pysa Oct 2020)
[4]
NHS Digital Pysa Oct 2020
NHS Digital. (2020, October 10). Pysa Ransomware: Another 'big-game hunter' ransomware. Retrieved March 17, 2021.
Open source URL
[5]
Pysa
(Citation: CERT-FR PYSA April 2020)(Citation: DFIR Pysa Nov 2020)(Citation: NHS Digital Pysa Oct 2020)
[6]
mitre-attackS0583
Open source URL

Source and licensing

Source: MITRE ATT&CK®. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation. Glexia is not affiliated with or endorsed by MITRE.

Official MITRE ATT&CK site Official STIX data repository MITRE ATT&CK terms of use