Indirect Command Execution via SFTP ProxyCommand
Detects the use of SFTP.exe to execute commands indirectly via ProxyCommand parameter. Threat actors were seen leveraging this legitimate Windows binary to bypass security controls and execute arbitrary commands while evading detection.
Detection logic
selection
Image|endswith: \sftp.exe
CommandLine|contains: ProxyCommand=Condition
selectionRaw YAML
title: Indirect Command Execution via SFTP ProxyCommand
id: 762bb580-79b4-40f4-8b9e-9349ce1710f4
status: experimental
description: |
Detects the use of SFTP.exe to execute commands indirectly via ProxyCommand parameter.
Threat actors were seen leveraging this legitimate Windows binary to bypass security controls and execute arbitrary commands while evading detection.
references:
- https://lolbas-project.github.io/lolbas/Binaries/Sftp/
- https://news.sophos.com/en-us/2025/05/09/lumma-stealer-coming-and-going/
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2026-04-27
tags:
- attack.stealth
- attack.t1202
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith: '\sftp.exe'
CommandLine|contains: 'ProxyCommand='
condition: selection
falsepositives:
- Legitimate use of SFTP with proxy commands for administration or networking tasks
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_lolbin_sftp_indirect_cmd_execution/info.ymlFalse positives
- Legitimate use of SFTP with proxy commands for administration or networking tasks