Data Encrypted for Impact T1486
Tactic: Impact
Adversaries may encrypt data on target systems or on large numbers of systems in a network to interrupt availability to system and network resources. They can attempt to render stored data inaccessible by encrypting files or data on local and remote drives and withholding access to a decryption key. This may be done in order to extract monetary compensation from a victim in exchange for decryption or a decryption key (ransomware) or to render data permanently inaccessible in cases where the key is not saved or transmitted.
Events covered
19 catalog events are tagged with this technique by at least one rule.
Authoring guide
These 88 rules share fields, values, and exclusions.
Fields filtered most (92 distinct)
These fields appear most often in rule filters.
Top indicator values (492 distinct)
These values appear most often in rule predicates.
Exclusions (150 distinct)
These values appear most often in top-level exclusions.
Rules under this technique
These vendors publish rules tagged with this technique.
Sigma 20 rules
- Antivirus - Ransomware Signature
- AWS EC2 Disable EBS Encryption
- AWS KMS Imported Key Material Usage
- BitLocker feature activation on multiple hosts (native)
- BitLocker feature configuration (Reg via command)
- BitLocker server feature activation (PowerShell)
- BlueSky Ransomware Artefacts
- FunkLocker Ransomware File Creation
- Load Of RstrtMgr.DLL By A Suspicious Process
- Load Of RstrtMgr.DLL By An Uncommon Process
- LockerGoga Ransomware Activity
- macOS Encryption Tool Usage
- Microsoft 365 - Potential Ransomware Activity
- Portable Gpg.EXE Execution
- Potential Conti Ransomware Activity
- Renamed Gpg.EXE Execution
- Suspicious Appended Extension
- Suspicious Creation TXT File in User Desktop
- Suspicious Reg Add BitLocker
- WannaCry Ransomware Activity
Elastic 21 rules
- AWS S3 Object Encryption Using External KMS Key
- DARKRADIATION Ransomware Infection
- Deprecated - M365 Security Compliance Potential Ransomware Activity
- Excessive AWS S3 Object Encryption with SSE-C
- Inhibit System Recovery Followed by a Suspicious File Rename
- Potential AWS S3 Bucket Ransomware Note Uploaded
- Potential Linux Ransomware Note Creation Detected
- Potential NFS Destructive Operation Burst
- Potential Ransomware Behavior - Note Files by System
- Potential Ransomware Note File Dropped via SMB
- PowerShell Script with Encryption/Decryption Capabilities
- Ransomware - Detected - Elastic Defend
- Ransomware - Prevented - Elastic Defend
- Suspicious Data Encryption via OpenSSL Utility
- Suspicious File Rename by an Unusual Process
- Suspicious File Rename from Unbacked Memory
- Suspicious File Rename via SMB
- Suspicious File Renamed via SMB
- Suspicious Renaming of ESXI Files
- Unusual AWS S3 Object Encryption with SSE-C
- VSS Service Disabled Followed by a Suspicious File Rename
Splunk 10 rules
- ASL AWS Detect Users creating keys with encrypt policy without MFA
- AWS Detect Users creating keys with encrypt policy without MFA
- AWS Detect Users with KMS keys performing encryption S3
- High Process Termination Frequency
- Ransomware Notes bulk creation
- Ryuk Test Files Detected
- Samsam Test File Write
- Windows .Key File Creation in Root Directory
- Windows BitLocker Suspicious Command Usage
- Windows DiskCryptor Usage
Kusto 23 rules
- Acronis - Multiple Endpoints Infected by Ransomware
- AV detections related to Dev-0530 actors
- AV detections related to Europium actors
- AV detections related to Hive Ransomware
- AV detections related to Zinc actors
- AWSCloudTrail - S3 bucket suspicious ransomware activity
- AWSCloudTrail - Suspicious overly permissive KMS key policy created
- Cisco SE - Ransomware Activity
- Dev-0270 Registry IOC - September 2022
- Dev-0530 File Extension Rename
- GTI - Actively Exploited Vulnerability Detected
- GTI - High and Critical Priority Alerts
- GTI - High Relevance Alert Detected
- GTI - Zero-Day Vulnerability Detected
- GTI Relevance System Alert - Incident by Alert ID
- Ransom Protect Detected a Ransomware Attack
- Ransom Protect User Blocked
- Ransomware Attack Detected
- Ransomware Client Blocked
- SSG_Security_Incidents
- Trend Micro CAS - Ransomware infection
- Trend Micro CAS - Ransomware outbreak
- Votiro - File Blocked in Email
Panther 14 rules
- AppOmni Alert Passthrough
- AWS EC2 EBS Encryption Disabled
- AWS S3 Object Copied to External Account Bucket
- AWS S3 Object Exfiltration WITH Object Deletion
- Azure Storage Blob CPK Encryption Detected
- Azure Storage Blob Upload WITH CPK Encryption Error
- GCP Cloud Storage Buckets Modified Or Deleted
- GCP GCS Bulk Object Rewrite Operation
- GCP GCS Ransom Note Upload
- GCP KMS Bulk Encryption by GCS Service Account
- GCP KMS Key Granted to GCS Service Account
- GCP KMS Key Version Disabled or Destroyed
- S3 Object Encrypted with External KMS Key
- Slack Potentially Malicious File Shared