WinSCP Execution (Windows Event Log)

Group by: _time, host
Source: github.com/anvilogic-forge/armory

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

Telemetry coverage

Provider	Record / event type
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

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

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventCode`	eq	`4688` corpus 317 (splunk 283, kusto 33, elastic 1)	`field:"EventID" kind:eq value:"4688"`

Search terms

These SPL tokens match against raw event text.

Stage	Term
1	`"<EventID>4688<"`
1	`"winscp.exe"`
1	`"/command"`
1	`"/script"`