S0381: FlawedAmmyy
FlawedAmmyy is a remote access tool (RAT) that was first seen in early 2016. The code for FlawedAmmyy was based on leaked source code for a version of Ammyy Admin, a remote access software.[1]
Security context for executives and security teams
S0381: FlawedAmmyy describes [FlawedAmmyy](https://attack.mitre.org/software/S0381) is a remote access tool (RAT) that was first seen in early 2016. The code for [FlawedAmmyy](https://attack.mitre.org/software/S0381) was based on leaked source code for a version of Ammyy Admin, a remote access software.(Citation: Proofpoint TA505 Mar 2018)
Executive priority
S0381: FlawedAmmyy 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 S0381: FlawedAmmyy 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 S0381: FlawedAmmyy 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.
FlawedAmmyy
FlawedAmmyy is a remote access tool (RAT) that was first seen in early 2016. The code for FlawedAmmyy was based on leaked source code for a version of Ammyy Admin, a remote access software.[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 | T1059.003 | Windows Command ShellSub-technique | FlawedAmmyy has used `cmd` to execute commands on a compromised host.CitationKorean FSI TA505 2020 |
| Enterprise | T1082 | System Information Discovery | FlawedAmmyy can collect the victim's operating system and computer name during the initial infection.[1] |
| Enterprise | T1056.001 | KeyloggingSub-technique | FlawedAmmyy can collect keyboard events.CitationKorean FSI TA505 2020 |
| Enterprise | T1033 | System Owner/User Discovery | FlawedAmmyy enumerates the current user during the initial infection.[1]CitationKorean FSI TA505 2020 |
| Enterprise | T1047 | Windows Management Instrumentation | FlawedAmmyy leverages WMI to enumerate anti-virus on the victim.[1] |
| Enterprise | T1547.001 | Registry Run Keys / Startup FolderSub-technique | FlawedAmmyy has established persistence via the `HKCU\SOFTWARE\microsoft\windows\currentversion\run` registry key.CitationKorean FSI TA505 2020 |
| Enterprise | T1059.001 | PowerShellSub-technique | FlawedAmmyy has used PowerShell to execute commands.CitationKorean FSI TA505 2020 |
| Enterprise | T1518.001 | Security Software DiscoverySub-technique | FlawedAmmyy will attempt to detect anti-virus products during the initial infection.[1] |
| Enterprise | T1218.011 | Rundll32Sub-technique | FlawedAmmyy has used `rundll32` for execution.CitationKorean FSI TA505 2020 |
| Enterprise | T1120 | Peripheral Device Discovery | FlawedAmmyy will attempt to detect if a usable smart card is current inserted into a card reader.[1] |
| Enterprise | T1071.001 | Web ProtocolsSub-technique | FlawedAmmyy has used HTTP for C2.[1] |
| Enterprise | T1041 | Exfiltration Over C2 Channel | FlawedAmmyy has sent data collected from a compromised host to its C2 servers.CitationKorean FSI TA505 2020 |
| Enterprise | T1113 | Screen Capture | FlawedAmmyy can capture screenshots.CitationKorean FSI TA505 2020 |
| Enterprise | T1105 | Ingress Tool Transfer | FlawedAmmyy can transfer files from C2.CitationKorean FSI TA505 2020 |
| Enterprise | T1056 | Input Capture | FlawedAmmyy can collect mouse events.CitationKorean FSI TA505 2020 |
| Enterprise | T1573.001 | Symmetric CryptographySub-technique | FlawedAmmyy has used SEAL encryption during the initial C2 handshake.[1] |
| Enterprise | T1005 | Data from Local System | FlawedAmmyy has collected information and files from a compromised machine.CitationKorean FSI TA505 2020 |
| Enterprise | T1115 | Clipboard Data | FlawedAmmyy can collect clipboard data.CitationKorean FSI TA505 2020 |
| Enterprise | T1001 | Data Obfuscation | FlawedAmmyy may obfuscate portions of the initial C2 handshake.[1] |
| Enterprise | T1218.007 | MsiexecSub-technique | FlawedAmmyy has been installed via `msiexec.exe`.CitationKorean FSI TA505 2020 |
| Enterprise | T1070.004 | File DeletionSub-technique | FlawedAmmyy can execute batch scripts to delete files.CitationKorean FSI TA505 2020 |
| Enterprise | T1069.001 | Local GroupsSub-technique | FlawedAmmyy enumerates the privilege level of the victim during the initial infection.[1]CitationKorean FSI TA505 2020 |
Groups, software, and campaigns
G0037: FIN6
G0092: TA505
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(2)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.2 | 1.2 | Current bundle | 3db6a32c4729… | ||
| 19.1 | 1.2 | Older bundle | 3db6a32c4729… |
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]Proofpoint TA505 Mar 2018
Proofpoint Staff. (2018, March 7). Leaked Ammyy Admin Source Code Turned into Malware. Retrieved May 28, 2019.
Open source URL - [2]mitre-attackS0381Open source URL
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