Threat Actors gamaredon

gamaredon

TLP:CLEAR

Active

Kill Chain Analysis Generate Graph Hunt Package

Also known as: Primitive Bear, ACTINIUM, Shuckworm, tracked as, Hive0051, Invisimole, UNC530, Gamaredon APT, Armageddon APT, Armageddon

Description

Gamaredon is a state-sponsored cyber espionage group targeting Ukrainian government entities, defense organizations, and critical infrastructure. The group operates with high sophistication, leveraging GammaSteel malware—an advanced stealer that resides entirely in memory and employs Windows DPAPI encryption. GammaSteel uses the HKCU\Printers registry key to store 71 distinct payload functions, making it highly persistent and difficult to detect. The malware utilizes three simultaneous data collection mechanisms: timed drive scans, USB monitoring for air-gapped systems, and real-time file surveillance. Exfiltration is conducted via legitimate S3-compatible cloud storage services or fallback channels to operator-controlled servers. Gamaredon's tactics include extensive use of VBScript for evasion, Dead Drop Resolvers on platforms like Telegram and Mastodon for C2 configuration, and bidirectional backdoor capabilities enabling arbitrary remote code execution. The group demonstrates high operational rigor with server rotations every 24 hours, indicating significant resource deployment and technical expertise.

Goals & Targeting

Targeted Sectors

Government

Defense

Non profit

Media

Critical infrastructure

Targeted Countries / Regions

Ukraine

AI Analysis

· 1 week ago

Executive Summary

Gamaredon (also known as UAC-0010 or Armagedon) is a suspected Russian FSB-linked advanced persistent threat (APT) group conducting espionage against Ukrainian government, military, and critical infrastructure targets. The group's primary tool, GammaSteel malware, employs sophisticated techniques to steal data, including memory-resident operations and multiple data acquisition methods. Gamaredon’s activities pose significant risks to national security and highlight the need for enhanced cybersecurity measures in targeted sectors.

Goals & Targeting

Gamaredon's primary objectives appear to be intelligence gathering and cyber espionage to support Russian interests in Ukraine. The targeting of government and defense sectors aligns with efforts to compromise sensitive information related to national security, military operations, and critical infrastructure. As a group apparently linked to the FSB, Gamaredon is likely focused on undermining Ukrainian sovereignty and resilience against Russian aggression

Enhanced Description

Key Capabilities

GammaSteel malware: Memory-resident stealer with multiple data collection mechanisms
Use of Windows DPAPI encryption for credential theft
VBScript-based evasion techniques
Dead Drop Resolvers on social media platforms for C2
Bidirectional backdoor capabilities for remote code execution
High automation in infrastructure management (server rotations every 24 hours)
Spear-phishing capabilities using macro-laced Office documents

MITRE ATT&CK Tactics

Collection

Exfiltration

Exploitation

Defense Evasion

Lateral Movement

Discovery

Credential Access

Impact

ATT&CK Techniques

T1059.003

T1055

T1566.001

T1003.001

T1078

T1218

T1040

Software / Tooling

GammaSteel malware

VBScript-based evasion tools

Dead Drop Resolvers

(Possible) Cobalt Strike-like frameworks

Mastodon/Telegram-based C2 infrastructure

Tebi.io S3-compatible cloud storage

Campaigns & Victims

Gamaredon has been active since at least late 2019, targeting Ukrainian entities with highly customized and persistent attacks. Campaigns involve extensive use of both in-memory malware and file-based persistence mechanisms. The group's operational tempo is relatively high but seems to adapt based on victimology and detection pressures. Notable operations include compromises of government agencies, military units, and critical infrastructure sites in Ukraine, likely aiming to disrupt response capabilities during periods of heightened geopolitical tension.

IOC Patterns

Spear-phishing emails with macro-laced Office documents
VBScript files dropped as temporary files or registry entries
Registry modifications under HKCU\Printers
Malicious S3 traffic to Tebi.io-like domains
C2 communications via Telegram/Mastodon-based Dead Drop Resolvers
USB drive monitoring in air-gapped environments
Scheduled task creation for persistence

Recommended Actions

Implement strict controls over .exe, .vbs, and .dll file execution
Monitor cloud storage access patterns for unusual S3 activity
Enhance detection of suspicious processes using Process Monitor tools
Conduct regular USB device audits in air-gapped environments
Adopt network segmentation to mitigate lateral movement risks
Train users to recognize phishing attempts and report suspicious emails

Suggested Tags

APT

Cyber espionage

State-sponsored

Ukraine

Government

Defense sector

FSB关联

Confidence Assessment

Confidence level: High, based on OSINT patterns, MISP reports, and K-reports. Data gaps include unclear origins beyond FSB associations and limited direct analysis of GammaSteel's source code.