City of Atlanta ransomware attack disrupts municipal services
In March 2018, the City of Atlanta suffered a ransomware attack that disrupted multiple municipal services and required extensive recovery work. Government and public-sector reporting cited the incident as an example of how ransomware can impose prolonged operational disruption and significant recovery costs on local governments. Public analyses describe the event as involving ransomware activity consistent with encrypting systems and disrupting service delivery.
First reported March 22, 2018Ransomwaremed overall confidence
T1486: Public-sector reporting describes ransomware-driven disruption consistent with data encryption for impact.
Mitigations
Now
Maintain offline/immutable backups and regularly test restoresEnables recovery without paying ransom and reduces business downtime when systems are encrypted or wiped.
Soon
Segment networks and restrict administrative privilegesSlows attacker movement and limits the blast radius of ransomware deployment across the enterprise.
Later
Harden endpoints/servers with EDR and restrict remote admin toolsImproves detection and blocking of ransomware behaviors and common lateral-movement mechanisms used to deploy payloads.
Detection ideas
Detect mass file encryption or destructive file operations
Alert on rapid renames/overwrites across many directories, creation of ransom notes, and high-entropy writes by unfamiliar processes.
Data sources: EDR telemetry, File integrity monitoring, Windows Security Event Logs
Detect lateral movement and remote execution used for ransomware deployment
Look for PsExec/SMB service creation, remote scheduled tasks, or WMIC usage followed by execution of the same binary on multiple hosts.
Data sources: EDR telemetry, Windows Security Event Logs, Network flow logs
