Detection rules › Sigma
Use Of The SFTP.EXE Binary As A LOLBIN
Detects the usage of the "sftp.exe" binary as a LOLBIN by abusing the "-D" flag
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
| Security-Auditing | Event ID 4688: A new process has been created. |
Rule body
title: Use Of The SFTP.EXE Binary As A LOLBIN
id: a85ffc3a-e8fd-4040-93bf-78aff284d801
status: test
description: Detects the usage of the "sftp.exe" binary as a LOLBIN by abusing the "-D" flag
references:
- https://github.com/LOLBAS-Project/LOLBAS/pull/264
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-11-10
tags:
- attack.execution
- attack.stealth
- attack.t1218
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith: '\sftp.exe' # The "sftp.exe" located in the OpenSSH directory has no OriginalFileName :(
CommandLine|contains:
# Since "-D" is a valid flag for other usage we assume the user is going to enter a path
# Either a full one like "C:\Windows\System32\calc.exe" or a relative one "..\..\..\Windows\System32\calc.exe"
# In my testing you can't execute direct binaries by their name via this method (if you found a way please update the rule)
- ' -D ..'
- ' -D C:\'
condition: selection
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith: '\sftp.exe'
CommandLine|contains:
- ' -D ..'
- ' -D C:\'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match |
Image | ends_with |
| field:"Image" kind:ends_with value:"\sftp.exe" |