Techniques
Sample rules
Suspicious Copy on System32
- source: splunk
- technicques:
- T1036.003
Description
The following analytic detects potentially suspicious file copy operations targeting the System32 or SysWow64 directories as source, often indicative of malicious activity. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on activity initiated by command-line tools like cmd.exe or PowerShell. This behavior is significant as it may indicate an attempt to evade defenses by copying an existing binary from the system directory and renaming it. If confirmed malicious, this activity could allow an attacker to execute code undetected and potentially leading to system compromise or further lateral movement within the network.
Detection logic
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime from datamodel=Endpoint.Processes where
Processes.parent_process_name IN (
"cmd.exe",
"powershell_ise.exe",
"powershell.exe",
"pwsh.exe",
"sqlps.exe",
"sqltoolsps.exe"
)
`process_copy`
Processes.process IN (
"* \"C:\\Windows\\System32\\*",
"* \'C:\\Windows\\System32\\*",
"* C:\\Windows\\System32\\*",
"* \"C:\\Windows\\SysWow64\\*",
"* \'C:\\Windows\\SysWow64\\*",
"* C:\\Windows\\SysWow64\\*"
)
by Processes.action Processes.dest Processes.original_file_name
Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
Processes.process Processes.process_exec Processes.process_guid Processes.process_hash
Processes.process_id Processes.process_integrity_level Processes.process_name Processes.process_path
Processes.user Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `suspicious_copy_on_system32_filter`