Adversaries using WannaCryptor ransomware may exfiltrate data through encrypted traffic or lateral movement to spread within the network, indicating potential ransomware activity. SOC teams should proactively hunt for these behaviors in Azure Sentinel to detect and mitigate WannaCryptor infections before significant data loss occurs.
IOC Summary
Malware Family: WannaCryptor Total IOCs: 6 IOC Types: sha1_hash, sha256_hash, md5_hash
| Type | Value | Threat Type | First Seen | Confidence |
|---|---|---|---|---|
| md5_hash | 0be31a0c4f530c88f1cdf8491827fa39 | payload | 2026-06-26 | 95% |
| sha256_hash | 9ee6705e84b232fa40fa8911064b68755615c4c8e26a1b9bb15b7e3fc91b646b | payload | 2026-06-26 | 95% |
| sha1_hash | cd0f34ec571a6b0ec988a00e4bb9a63425869ccd | payload | 2026-06-26 | 95% |
| sha256_hash | 9fdfcf7a50597fe85398f2a3520919f8c309f087c433a509ac0f730d363cf5ee | payload | 2026-06-26 | 95% |
| sha1_hash | a9e0b176984c9194f40e70e093527a46acd40a29 | payload | 2026-06-26 | 95% |
| md5_hash | 5d6ee171b5847a25c2d068031faef9cc | payload | 2026-06-26 | 95% |
// Hunt for files matching known malicious hashes
// Source: ThreatFox - WannaCryptor
let malicious_hashes = dynamic(["0be31a0c4f530c88f1cdf8491827fa39", "9ee6705e84b232fa40fa8911064b68755615c4c8e26a1b9bb15b7e3fc91b646b", "cd0f34ec571a6b0ec988a00e4bb9a63425869ccd", "9fdfcf7a50597fe85398f2a3520919f8c309f087c433a509ac0f730d363cf5ee", "a9e0b176984c9194f40e70e093527a46acd40a29", "5d6ee171b5847a25c2d068031faef9cc"]);
DeviceFileEvents
| where SHA256 in (malicious_hashes) or SHA1 in (malicious_hashes) or MD5 in (malicious_hashes)
| project Timestamp, DeviceName, FileName, FolderPath, SHA256, InitiatingProcessFileName
| order by Timestamp desc| Sentinel Table | Notes |
|---|---|
DeviceFileEvents | Ensure this data connector is enabled |
Scenario: Legitimate scheduled backup job using encrypted files
Description: A backup process may encrypt files as part of its routine, such as using Veeam Backup & Replication or Commvault, which can generate encrypted traffic or file modifications.
Filter/Exclusion: Check for file paths associated with backup directories (e.g., C:\Backup, D:\VMBackups) or use a filter like file_path contains "backup" or process_name contains "veeam".
Scenario: System update or patching using encrypted payloads
Description: Some enterprise patching tools, like Microsoft Update or WSUS, may use encrypted payloads for secure delivery, which could trigger the rule.
Filter/Exclusion: Filter by process_name contains "wusa.exe" or process_name contains "wsus" and exclude traffic related to known update servers (e.g., update.microsoft.com).
Scenario: Admin task involving file encryption for compliance
Description: Administrators may use tools like BitLocker or Veeam to encrypt drives or files for compliance, which can resemble WannaCryptor behavior.
Filter/Exclusion: Use a filter like process_name contains "manage-bde.exe" or process_name contains "veeam" and check for known BitLocker or Veeam-related file paths.
Scenario: Network traversal for legitimate remote access
Description: Tools like Cisco AnyConnect or LogMeIn may traverse networks and generate encrypted traffic, which could be flagged by the rule.
Filter/Exclusion: Filter by process_name contains "anyconnect", process_name contains "logmein", or check for known remote access tool (RAT) IPs or domains.
Scenario: Use of encrypted communication for secure internal services