Some BlueHammer detections#4037
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| description: Detects a non-system process causing creation of CldFlt0.etl under C:\Windows\System32\LogFiles\CloudFiles\. This path is initialised by the CldFlt driver when a process calls CfRegisterSyncRoot() or CfConnectSyncRoot(). In the RedSun exploit this is a side-effect of the DoCloudStuff() function that registers a fake sync provider to create the cloud-tagged bait file. Legitimate cloud providers (OneDrive etc.) register sync roots from SYSTEM-level service processes, not from user-context executables. | ||
| data_source: | ||
| - Sysmon EventID 11 | ||
| search: '`sysmon` EventCode=11 (TargetFilename = "*\\Windows\\System32\\LogFiles\\CloudFiles\\*" NOT Image IN ("*\\Windows\\System32*", "*\\Windows\\SysWOW64*","*\\Program Files\\WindowsApps*")) | stats count min(_time) as firstTime max(_time) as lastTime by action dest file_name file_path Image process_guid process_id user_id vendor_product | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_cloud_files_filter_log_created_by_non_system_process_filter`' |
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can we also perhaps improve the formatting for all these sysmon searches in the PR such that it reads well - it does help with making the review a bit simpler
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Contains detections and stories around BlueHammer and RedSun as well as a new data source for Windows 4723
Detections:
Stories: