Full Report
Sinclair Broadcast Group, one of the largest television network conglomerates in the U.S fell victim to a ransomware attack causing mass disruptions throughout its entire network.
Analysis Summary
# Incident Report: Sinclair Broadcast Group Ransomware Attack
## Executive Summary
Sinclair Broadcast Group suffered a significant ransomware attack attributed to the notorious Russian cybercriminal group, Evil Corp. The attack, which began around October 16, 2021, resulted in the encryption of critical internal systems, disruption of office and operational networks, and the exfiltration of company data. The response involved immediate containment efforts, leading to significant operational degradation, forcing some broadcasts to revert to 1970s-era production methods.
## Incident Details
- Discovery Date: October 16, 2021
- Incident Date: On or before October 16, 2021
- Affected Organization: Sinclair Broadcast Group
- Sector: Media / Television Broadcasting
- Geography: United States
## Timeline of Events
### Initial Access
- Date/Time: On or before October 16, 2021
- Vector: Not explicitly disclosed, but the attack was launched by Evil Corp.
- Details: The organization identified and began investigating a potential security incident on this date.
### Lateral Movement
- Details: Attackers successfully encrypted servers and workstations and disrupted office and operational networks, indicating successful internal propagation. (Specific lateral movement techniques were not fully detailed in the source).
### Data Exfiltration/Impact
- Date/Time: Confirmed by October 17, 2021
- Details: Besides encryption, the attackers successfully exfiltrated data from the company’s network. Encryption caused mass disruptions, severely impacting news production capabilities (e.g., loss of graphics/prompters).
### Detection & Response
- Date/Time: October 16-17, 2021
- Details: On October 16, the company identified the incident and began investigation and containment steps. On October 17, the scope of encryption and data theft was confirmed.
## Attack Methodology
- Initial Access: Unknown (Attributed to Evil Corp)
- Persistence: Not explicitly detailed.
- Privilege Escalation: Not explicitly detailed.
- Defense Evasion: Not explicitly detailed, but the use of a known, sophisticated gang suggests mature evasion techniques.
- Credential Access: Not explicitly detailed.
- Discovery: Not explicitly detailed.
- Lateral Movement: Implied through the encryption of widespread servers and workstations.
- Collection: Data was exfiltrated prior to or concurrent with encryption.
- Exfiltration: Successful data exfiltration occurred.
- Impact: Ransomware encryption using a novel strain, 'Macaw ransomware' (a variation of WastedLocker), severely disrupting operations.
## Impact Assessment
- Financial: Not disclosed, but implied to be significant due to operational disruption.
- Data Breach: Data was confirmed to be taken from the network; the specific type and volume are under investigation by the company.
- Operational: Mass disruption across the entire network. Critical internal processes were encrypted. Broadcast operations reverted to primitive methods (e.g., 1970s-style newscasts without graphics or prompters).
- Reputational: High professional exposure due to the very public disruption of primary news delivery services.
## Indicators of Compromise
- Network indicators: N/A (URLs/IPs omitted as per instructions)
- File indicators: Macaw ransomware (a WastedLocker variation)
- Behavioral indicators: Mass system encryption affecting office and operational networks.
## Response Actions
- Containment: Steps were initiated starting October 16 to contain the potential security incident.
- Eradication: Not detailed.
- Recovery: The company was actively working to determine the scope of the stolen data and restore systems; recovery was ongoing significantly past the initial detection date.
## Lessons Learned
- The incident highlights the evolution of ransomware groups combining encryption with data theft, meaning any ransomware incident must now be treated as a data breach.
- Reliance on modern systems created a single point of catastrophic failure, as the attack seized all modern systems.
## Recommendations
- Enhance network segmentation to limit the blast radius of ransomware propagation.
- Immediately implement robust, offline/immutable backups to ensure rapid recovery from encryption events.
- Review and strengthen detection mechanisms against known ransomware families like WastedLocker variants.
- Implement privileged access management and multi-factor authentication across all critical infrastructure to prevent widespread lateral movement following initial access.