H3XA — Operational Evidence

TypeMalware

External ID—

First seen2026-08-14

Last seen2026-08-14

Confidence

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[SysUpdate](https://attack.mitre.org/software/S0663) is a backdoor written in C++ that has been used by [Threat Group-3390](https://attack.mitre.org/groups/G0027) since at least 2020.(Citation: Trend Micro Iron Tiger April 2021)

Labels

malware

32 recorded

Relationships

uses

to Code Signing

Technique

uses

to Data from Local System

Technique

uses

to Deobfuscate/Decode Files or Information

Technique

uses

to DLL

Technique

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to DNS

Technique

uses

to Encrypted/Encoded File

Technique

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to Exfiltration Over C2 Channel

Technique

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to File and Directory Discovery

Technique

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to File Deletion

Technique

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to Fileless Storage

Technique

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to Hidden Files and Directories

Technique

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to Ingress Tool Transfer

Technique

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to Internet Connection Discovery

Technique

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to Local Storage Discovery

Technique

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to Masquerade Task or Service

Technique

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to Modify Registry

Technique

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to Native API

Technique

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to Process Discovery

Technique

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to Registry Run Keys / Startup Folder

Technique

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to Screen Capture

Technique

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to Service Execution

Technique

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to Software Packing

Technique

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to Standard Encoding

Technique

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to Symmetric Cryptography

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to Systemd Service

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to System Information Discovery

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to System Network Configuration Discovery

Technique

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to System Owner/User Discovery

Technique

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to System Service Discovery

Technique

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to Windows Management Instrumentation

Technique

uses

to Windows Service

Technique

uses

from Threat Group-3390

Group

5 external

References

mitre-attack

S0663

open

HyperSSL

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Soldier

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FOCUSFJORD

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Trend Micro Iron Tiger April 2021

https://www.trendmicro.com/en_us/research/21/d/iron-tiger-apt-updates-toolkit-with-evolved-sysupdate-malware-va.html

open