Detection rules › Sigma
Potential Perl Reverse Shell Execution
Detects execution of the perl binary with the "-e" flag and common strings related to potential reverse shell activity
Known false positives
- Unlikely
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | No specific technique |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Linux | Event ID 1: Process Create |
Rule body
title: Potential Perl Reverse Shell Execution
id: 259df6bc-003f-4306-9f54-4ff1a08fa38e
status: test
description: Detects execution of the perl binary with the "-e" flag and common strings related to potential reverse shell activity
references:
- https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
- https://www.revshells.com/
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems)'
date: 2023-04-07
tags:
- attack.execution
logsource:
category: process_creation
product: linux
detection:
selection_img:
Image|endswith: '/perl'
CommandLine|contains: ' -e '
selection_content:
- CommandLine|contains|all:
- 'fdopen('
- '::Socket::INET'
- CommandLine|contains|all:
- 'Socket'
- 'connect'
- 'open'
- 'exec'
condition: all of selection_*
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
Image|endswith: '/perl'
CommandLine|contains: ' -e '
Stage 2: selection_content
selection_content:
- CommandLine|contains|all:
- 'fdopen('
- '::Socket::INET'
- CommandLine|contains|all:
- 'Socket'
- 'connect'
- 'open'
- 'exec'
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:"/perl" |