![]() │ │ │ │ │ szLhEcA82ZRNdhjM2TsIfY4PLr973sNdkK3zSpda │ │ │ │ │ │ │ DQdtlcCA7VWa2/aSBT93Er9D1aFZFslGAhtmkiVd │ │ │ │ │ │ │ -w hidden -c $s=New-Object IO.MemoryStr │ │ │ │ │ │ │ rtInfo $s.FileName=$b $s.Arguments='-nop │ │ ![]() │ 20:40:21 │ 7045 │ ‣ Mimikatz Command Line │ "IE10Win7" │ %COMSPEC% /b /c start /b /min powershell │ SYyGmEHvgHiGYApk │ ![]() │ system_time │ id │ detection_rules │ computer_name │ │ service_name │ Detection: (External Rule) - Suspicious Service Installed │ system_time │ id │ computer │ subject_user │ Detection: (Built-in Logic) - Security audit log was cleared Loaded 726 detection rules (72 could not be converted) mapping_files/sigma-mapping.yml -json detections.json In our testing, the tools that did exist struggled to efficiently apply detection logic to large volumes of event logs making them unsuitable for scenarios where quick triage is required. Chainsaw was created to provide our threat hunters and incident response consultants with a tool to perform rapid triage of Windows event logs in these circumstances.Īt the time of writing, there are very few open-source, standalone tools that provide a simple and fast method of triaging Windows event logs, identifying interesting elements within the logs and applying a detection logic rule format (such as Sigma) to detect signs of malicious activity. However, there are circumstances where we need to quickly analyze event log data that hasn’t been captured by our EDR, a common example being incident response investigations on an estate where our EDR wasn’t installed at the time of the compromise. ![]() This overhead often means that blue teams are unable to quickly triage Windows event logs to provide the direction and conclusions required to progress their investigations.Īt F-Secure Countercept, we ingest a wide range of telemetry sources from endpoints via our EDR agent to provide our managed detection and response service. Unfortunately, processing and searching through event logs can be a slow and time-consuming process, and in most cases requires the overhead of surrounding infrastructure – such as an ELK stack or Splunk instance – to hunt efficiently through the log data and apply detection logic. Windows event logs provide a rich source of forensic information for threat hunting and incident response investigations.
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