Blacksuit
Since Jun 12, 2023, Blacksuit has listed 184 organizations on its leak site.
Listings per month
- Total listings
- 184
- First listing
- Jun 12, 2023
- Latest listing
- Jun 2, 2025
- MITRE ATT&CK techniques
- 18
Blacksuit is classified as ransomware group.
It posted no listings in the last 12 months.
Most targeted country: United States, with 115 listings (63% of the total).
Most targeted sector: Professional Services, with 49 listings (27% of the total).
Targeted countries
Showing 10 of 184 results
18 MITRE ATT&CK techniques across 6 stages are documented in the group's attacks.
- 1
Resource development
Infrastructure, accounts and tools for the attack are prepared.
T1650Acquire Access - 2
Initial access
The attacker gets into the corporate network for the first time.
T1021.001Remote Services: Remote Desktop ProtocolT1133External Remote ServicesT1190Exploit Public-Facing ApplicationT1566PhishingT1566.001Phishing: Spear phishing AttachmentT1566.002Phishing: Spear phishing Link - 3
Privilege escalation
The attacker moves to accounts with higher privileges.
T1078Valid AccountsT1078.002Valid Accounts: Domain Accounts - 4
Defense evasion
Security software and logging are bypassed.
T1021.001Remote Services: Remote Desktop ProtocolT1070.001Indicator Removal: Clear Windows Event LogsT1119Automated CollectionT1484.001Domain Policy Modification: Group Policy ModificationT1562.001Impair Defenses: Disable or Modify Tools - 5
Command and control
Compromised systems are controlled remotely.
T1105Ingress Tool TransferT1572Protocol Tunneling - 6
Impact
Systems are encrypted or services are stopped.
T1486Data Encrypted for ImpactT1490Inhibit System Recovery
What does a ransomware group do?
Ransomware groups break into corporate networks, move data out and encrypt systems. If the ransom is not paid, they list the organization on a leak site and threaten to publish the data.
How does Blacksuit get into organizations?
The attacker gets into the corporate network for the first time.
- T1021.001 · Remote Services: Remote Desktop Protocol
- T1133 · External Remote Services
- T1190 · Exploit Public-Facing Application
- T1566 · Phishing
- T1566.001 · Phishing: Spear phishing Attachment
- T1566.002 · Phishing: Spear phishing Link
Which defenses matter most?
Priority defenses based on the documented techniques:
- Keep internet-facing VPN, remote desktop and firewall interfaces patched, and require multi-factor authentication on these accounts.
- Reduce local administrator accounts and perform privileged tasks from separate, monitored accounts.
- Alert when security software is disabled or logs are cleared.
- Block unapproved use of remote management tools.
- Keep offline, immutable backups and test restores regularly.
What should you do if your organization is listed on a leak site?
- Record the listing and any published sample files; do not visit the leak site from the corporate network.
- Isolate affected systems and preserve logs without deleting them.
- Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
- Make any decision about the ransom demand together with legal, management and incident response.
- Do not bring systems back online before the attacker’s entry point is closed.
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