Cyber Resilience

Threat actor · all actors

Mustard TempestG1020 unknown

aka Mustard Tempest, DEV-0206, TA569, GOLD PRELUDE, UNC1543, Purple Vallhund

Last updated: 2026-08-20

0attributed CVEs
18ATT&CK techniques
0.0IDF score (tooling uniqueness)
0exclusive CVEs
—years active

About this actor

[Mustard Tempest](https://attack.mitre.org/groups/G1020) is an initial access broker that has operated the [SocGholish](https://attack.mitre.org/software/S1124) distribution network since at least 2017. [Mustard Tempest](https://attack.mitre.org/groups/G1020) has partnered with [Indrik Spider](https://attack.mitre.org/groups/G0119) to provide access for the download of additional malware including LockBit, [WastedLocker](https://attack.mitre.org/software/S0612), and remote access tools.(Citation: Microsoft Ransomware as a Service)(Citation: Microsoft Threat Actor Naming July 2023)(Citation: Secureworks Gold Prelude Profile)(Citation: SocGholish-update)

Source: MITRE ATT&CK

Names & naming systems

Each vendor coins its own name for the same actor. Where a name follows a known scheme we attribute it; the rest are listed honestly as unclassified.

MITRE ATT&CKG-number catalogue id

G1020

Microsoftweather-system names

Mustard Tempest

MandiantUNC uncategorised cluster

UNC1543

Secureworkscolour-metal names

GOLD PRELUDE

ProofpointTA threat-actor id

TA569

Unclassifiedno scheme matched

DEV-0206Purple Vallhund

How we know this

Data origin
MITRE ATT&CK Imported from the MITRE ATT&CK STIX bundle as an intrusion-set object.
Techniques
MITRE ATT&CK STIX mappings — 18 ATT&CK techniques on file.
Named victims
None on file.

See how actor data is built for the full pipeline.

Activity timeline

No activity events recorded.

Profile

CVERiskCVSSEPSSPublishedProducts
No attributed CVEs.

Mitigating controls (NIST 800-53)

ControlTechniques coveredCoverage
CA-78 / 1844%
CM-28 / 1844%
CM-68 / 1844%
SI-38 / 1844%
SI-48 / 1844%
AC-46 / 1833%
SC-76 / 1833%
CM-75 / 1828%
IA-94 / 1822%
SC-444 / 1822%
SI-24 / 1822%
SI-74 / 1822%
SI-84 / 1822%
AC-63 / 1817%
SI-103 / 1817%

Co-occurring actors

None.

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