Detection rules › Splunk
WinSCP Execution (Windows Event Log)
WinSCP is an open source free SFTP client, FTP client, WebDAV client, S3 client and SCP client for Windows. Its main function is file transfer between a local and a remote computer. Adversaries have been known to use winscp in order to exfiltrate data
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Exfiltration | T1048.003 Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted Non-C2 Protocol |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
id: '6358.7083'
title: WinSCP Execution
description: 'WinSCP is an open source free SFTP client, FTP client, WebDAV client,
S3 client and SCP client for Windows. Its main function is file transfer between
a local and a remote computer. Adversaries have been known to use winscp in order
to exfiltrate data. - Threat Actor Association: BlueNoroff, Lazarus, Stonefly, Wizard
Spider -- Software Association: Akira, Bazar, Conti, LockBit, Play, Rhysida'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
"<EventID>4688<" OR Type=Process) ("winscp.exe" OR ("/command" OR "/script")) |
table _time, host, user process, process_*, signature_id, parent_* | bin span=1s
| stats values(*) as * by _time, host '
techniques:
- exfiltration:exfiltration over alternative protocol:exfiltration over unencrypted
non-c2 protocol
technique_id:
- T1048.003
data_category:
- Windows event logs
references:
- https://www.mcafee.com/blogs/other-blogs/mcafee-labs/darkside-ransomware-victims-sold-short/
- https://winscp.net/eng/docs/introduction
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR "<EventID>4688<" OR Type=Process) ("winscp.exe" OR ("/command" OR "/script"))
Stage 2: table
| table _time, host, user process, process_*, signature_id, parent_*
Stage 3: bucket
| bin span=1s
Stage 4: stats
| stats values(*) as * by _time, host
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
EventCode | eq |
|
Search terms
Bare-string tokens in the SPL search body. Splunk matches each token against _raw (the untyped raw event text) anywhere it appears, not against a specific field. These don't surface in the Indicators table because they aren't predicates on a known field.
| Stage | Term |
|---|---|
| 1 | TERM |
| 1 | "<EventID>4688<" |
| 1 | "winscp.exe" |
| 1 | "/command" |
| 1 | "/script" |