Techniques
Sample rules
Windows Renamed LOLBAS Binary was Executed
- source: splunk
- technicques:
Description
The following analytic identifies a LOLBAS process being executed where it’s process name does not match it’s original file name attribute. Processes that have been renamed and executed may be an indicator that an adversary is attempting to evade defenses or execute malicious code. The LOLBAS project documents Windows native binaries that can be abused by threat actors to perform tasks like executing malicious code.
Detection logic
| tstats `security_content_summariesonly`
count min(_time) AS firstTime
max(_time) AS lastTime
FROM datamodel=Endpoint.Processes WHERE
[
| inputlookup renamed_lolbas_binaries
| rename original_file_name as Processes.original_file_name
| table Processes.original_file_name
]
NOT Processes.process_name IN (
"excelcnv.exe",
"installutil64.exe",
"protoc~1.exe",
"regwrite.exe",
"vzshadow.exe"
)
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)`
| eval process_name_norm=replace(lower(process_name), "\.exe$", ""),
original_file_name_norm=replace(lower(original_file_name), "\.exe$", "")
| where process_name_norm != original_file_name_norm
| lookup local=t renamed_lolbas_binaries original_file_name OUTPUT description
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_renamed_lolbas_binary_was_executed_filter`