Crosslock
Since Apr 17, 2023, Crosslock has listed 1 organizations on its leak site.
Listings per month
- Total listings
- 1
- First listing
- Apr 17, 2023
- Latest listing
- Apr 17, 2023
- MITRE ATT&CK techniques
- 10
CrossLock is a short-lived Go-based ransomware group that appeared in April 2023 and went dark by July 2023, using Curve25519 and ChaCha20 encryption and double-extortion tactics with only one known confirmed victim in the IT sector in Brazil.
It posted no listings in the last 12 months.
Most targeted country: Brazil, with 1 listings (100% of the total).
Most targeted sector: Agriculture and Food Production, with 1 listings (100% of the total).
Targeted countries
Targeted sectors
Showing 1 of 1 results
10 MITRE ATT&CK techniques across 6 stages are documented in the group's attacks.
- 1
Execution
Malicious code runs on the target system.
T1059Command and Scripting Interpreter - 2
Privilege escalation
The attacker moves to accounts with higher privileges.
T1548Abuse Elevation Control Mechanism - 3
Defense evasion
Security software and logging are bypassed.
T1055Process InjectionT1070Indicator Removal - 4
Discovery
Systems, accounts and data on the network are mapped.
T1007System Service DiscoveryT1057Process DiscoveryT1083File and Directory Discovery - 5
Lateral movement
The attacker moves to other systems inside the network.
T1021Remote Services - 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.
Which defenses matter most?
Priority defenses based on the documented techniques:
- Allow scripts and macros only for users who need them, and keep behavioral rules enabled in endpoint protection.
- Reduce local administrator accounts and perform privileged tasks from separate, monitored accounts.
- Alert when security software is disabled or logs are cleared.
- Monitor accounts that run many queries in a short time and unusual network scans.
- Segment the network and expose management protocols only on the management network.
- 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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