elastic / elastic/detection-rules
[New Rule] Suspicious Content Extracted or Decompressed via Built-In Utilities
- Dominant language
- Python
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Description
## Description
Identifies when suspicious content is extracted from a file and subsequently decompressed using the funzip utility.
Malware may execute the tail utility using the "-c" option to read a sequence of bytes from the end of a file. The
output from tail can be piped to funzip in order to decompress malicious code before it is executed. This behavior is
consistent with malware families such as Bundlore.
### Target indexes
logs-*
### Target Operating Systems
macOS
### Tested ECS Version
1.11.0
### Query
```sql
process where event.type == "start" and event.action == "exec" and
(process.args : "tail" and process.args : "-c" and process.args : "funzip")
```
### References
https://attack.mitre.org/software/S0482/
https://github.com/elastic/endpoint-rules/blob/c3d745dded34ff824a5a16b1c29ad4a4f9d260e7/rules/deprecated/execution_suspicious_content_extracted_or_decompressed_via_builtin_utilities.toml#L11
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