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MITRE ATT&CK® Malware

S0598: P.A.S. Webshell

P.A.S. Webshell is a publicly available multifunctional PHP webshell in use since at least 2016 that provides remote access and execution on target web servers.[1]

EnterpriseS0598MalwareObject v1.0Modified
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Glexia's Take · Automated analysis

Security context for executives and security teams

Automation confidenceMedium

S0598: P.A.S. Webshell describes [P.A.S. Webshell](https://attack.mitre.org/software/S0598) is a publicly available multifunctional PHP webshell in use since at least 2016 that provides remote access and execution on target web servers.(Citation: ANSSI Sandworm January 2021)

Executive priority

S0598: P.A.S. Webshell 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 S0598: P.A.S. Webshell by reviewing the official ATT&CK relationships, mapped tactics (the mapped ATT&CK tactic context), supported platforms (Linux, 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 S0598: P.A.S. Webshell 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

P.A.S. Webshell

P.A.S. Webshell is a publicly available multifunctional PHP webshell in use since at least 2016 that provides remote access and execution on target web servers.[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.

15 rows
DomainIDNameRelationship / procedure
EnterpriseT1140Deobfuscate/Decode Files or Information

P.A.S. Webshell can use a decryption mechanism to process a user supplied password and allow execution.[1]

EnterpriseT1083File and Directory Discovery

P.A.S. Webshell has the ability to list files and file characteristics including extension, size, ownership, and permissions.[1]

EnterpriseT1505.003Web ShellSub-technique

P.A.S. Webshell can gain remote access and execution on target web servers.[1]

EnterpriseT1005Data from Local System

P.A.S. Webshell has the ability to copy files on a compromised host.[1]

EnterpriseT1222.002Linux and Mac PermissionsSub-technique

P.A.S. Webshell has the ability to modify file permissions.[1]

EnterpriseT1071.001Web ProtocolsSub-technique

P.A.S. Webshell can issue commands via HTTP POST.[1]

EnterpriseT1059Command and Scripting Interpreter

P.A.S. Webshell has the ability to create reverse shells with Perl scripts.[1]

EnterpriseT1518Software Discovery

P.A.S. Webshell can list PHP server configuration details.[1]

EnterpriseT1027Obfuscated Files or Information

P.A.S. Webshell can use encryption and base64 encoding to hide strings and to enforce access control once deployed.[1]

EnterpriseT1070.004File DeletionSub-technique

P.A.S. Webshell can delete scripts from a subdirectory of /tmp after they are run.[1]

EnterpriseT1046Network Service Discovery

P.A.S. Webshell can scan networks for open ports and listening services.[1]

EnterpriseT1213.006DatabasesSub-technique

P.A.S. Webshell has the ability to list and extract data from SQL databases.[1]

EnterpriseT1110.001Password GuessingSub-technique

P.A.S. Webshell can use predefined users and passwords to execute brute force attacks against SSH, FTP, POP3, MySQL, MSSQL, and PostgreSQL services.[1]

EnterpriseT1105Ingress Tool Transfer

P.A.S. Webshell can upload and download files to and from compromised hosts.[1]

EnterpriseT1087.001Local AccountSub-technique

P.A.S. Webshell can display the /etc/passwd file on a compromised host.[1]

Associated objects

Groups, software, and campaigns

GroupEnterprise

G0034: Sandworm Team

Sandworm Team is a destructive threat group that has been attributed to Russia's General Staff Main Intelligence Directorate (GRU) Main Center for Special Technologies (GTsST) military unit 74455.[1][2] This group has been active since at least 2009.[3][4][5][6]

In October 2020, the US indicted six GRU Unit 74455 officers associated with Sandworm Team for the following cyber operations: the 2015 and 2016 attacks against Ukrainian electrical companies and government organizations, the 2017 worldwide NotPetya attack, targeting of the 2017 French presidential campaign, the 2018 Olympic Destroyer attack against the Winter Olympic Games, the 2018 operation against the Organisation for the Prohibition of Chemical Weapons, and attacks against the country of Georgia in 2018 and 2019.[1][2] Some of these were conducted with the assistance of GRU Unit 26165, which is also referred to as APT28.[7]

GroupEnterprise

G1003: Ember Bear

Ember Bear is a Russian state-sponsored cyber espionage group that has been active since at least 2020, linked to Russia's General Staff Main Intelligence Directorate (GRU) 161st Specialist Training Center (Unit 29155).[1] Ember Bear has primarily focused operations against Ukrainian government and telecommunication entities, but has also operated against critical infrastructure entities in Europe and the Americas.[2] Ember Bear conducted the WhisperGate destructive wiper attacks against Ukraine in early 2022.[3][4][1] There is some confusion as to whether Ember Bear overlaps with another Russian-linked entity referred to as Saint Bear. At present available evidence strongly suggests these are distinct activities with different behavioral profiles.[2][5]

Relationship explorer

All related ATT&CK context

uses · GroupG0034: Sandworm TeamEnterpriseuses · GroupG1003: Ember BearEnterpriseuses · TechniqueT1140: Deobfuscate/Decode Files or InformationEnterpriseuses · TechniqueT1083: File and Directory DiscoveryEnterpriseuses · TechniqueT1505.003: Web ShellEnterpriseuses · TechniqueT1005: Data from Local SystemEnterpriseuses · TechniqueT1222.002: Linux and Mac PermissionsEnterpriseuses · TechniqueT1071.001: Web ProtocolsEnterpriseuses · TechniqueT1059: Command and Scripting InterpreterEnterpriseuses · TechniqueT1518: Software DiscoveryEnterpriseuses · TechniqueT1027: Obfuscated Files or InformationEnterpriseuses · TechniqueT1070.004: File DeletionEnterpriseuses · TechniqueT1046: Network Service DiscoveryEnterpriseuses · TechniqueT1213.006: DatabasesEnterpriseuses · TechniqueT1110.001: Password GuessingEnterpriseuses · TechniqueT1105: Ingress Tool TransferEnterpriseuses · TechniqueT1087.001: Local AccountEnterprise
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
Modified
Raw hash
c6c4c5b09d857775...
Imported snapshots across ATT&CK releases(2)
ReleaseBundle importedObject versionModifiedStatusRaw hash
19.21.0Current bundlec6c4c5b09d85…
19.11.0Older bundlec6c4c5b09d85…
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 JSONOpen 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. [1]
    ANSSI Sandworm January 2021

    ANSSI. (2021, January 27). SANDWORM INTRUSION SET CAMPAIGN TARGETING CENTREON SYSTEMS. Retrieved March 30, 2021.

    Open source URL
  2. [2]
    Fobushell

    (Citation: NCCIC AR-17-20045 February 2017)

  3. [3]
    NCCIC AR-17-20045 February 2017

    NCCIC. (2017, February 10). Enhanced Analysis of GRIZZLY STEPPE Activity. Retrieved April 12, 2021.

    Open source URL
  4. [4]
    mitre-attackS0598
    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.

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