Cyber Resilience

Threat actor · all actors

Star BlizzardG1033 state

🇷🇺 RU

aka Star Blizzard, SEABORGIUM, Callisto Group, TA446, COLDRIVER, Cold River, Nahr Elbard, Nahr el bared, Callisto, GOSSAMER BEAR, BlueCharlie, TAG-53, IRON FRONTIER, UNC4057, Blue Callisto, COLD RELIC

Last updated: 2026-08-20

0attributed CVEs
31ATT&CK techniques
0.0IDF score (tooling uniqueness)
0exclusive CVEs
—years active

About this actor

[Star Blizzard](https://attack.mitre.org/groups/G1033) is a cyber espionage and influence group originating in Russia that has been active since at least 2019. [Star Blizzard](https://attack.mitre.org/groups/G1033) campaigns align closely with Russian state interests and have included persistent phishing and credential theft against academic, defense, government, NGO, and think tank organizations in NATO countries, particularly the US and the UK.(Citation: Microsoft Star Blizzard August 2022)(Citation: CISA Star Blizzard Advisory December 2023)(Citation: StarBlizzard)(Citation: Google TAG COLDRIVER January 2024)

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

G1033

Microsoftweather-system names

Star Blizzard

CrowdStrikenation-animal names

GOSSAMER BEAR

MandiantUNC uncategorised cluster

UNC4057

Secureworkscolour-metal names

IRON FRONTIER

ProofpointTA threat-actor id

TA446

Recorded FutureTAG id

TAG-53

Unclassifiedno scheme matched

SEABORGIUMCallisto GroupCOLDRIVERCold RiverNahr ElbardNahr el baredCallistoBlueCharlieBlue CallistoCOLD RELIC

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 — 31 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
CM-615 / 3148%
SI-414 / 3145%
CM-212 / 3139%
CA-711 / 3135%
AC-410 / 3132%
SC-710 / 3132%
SI-310 / 3132%
SI-78 / 3126%
AC-37 / 3123%
SC-447 / 3123%
SI-87 / 3123%
IA-26 / 3119%
IA-96 / 3119%
AC-175 / 3116%
AC-65 / 3116%

Co-occurring actors

None.

Similar actors

Similar TTPs

Same nation-state

Same category