Detectionhightest
Shell Execution via Flock - Linux
Detects the use of the "flock" command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
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Launch
Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)Created Mon Sep 024b09c71e-4269-4111-9cdd-107d8867f0cclinux
Log Source
LinuxProcess Creation
ProductLinux← raw: linux
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic2 selectors
detection:
selection_img:
Image|endswith: '/flock'
CommandLine|contains: ' -u '
selection_cli:
CommandLine|contains:
- '/bin/bash'
- '/bin/dash'
- '/bin/fish'
- '/bin/sh'
- '/bin/zsh'
condition: all of selection_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
MITRE ATT&CK
Tactics
Techniques
Rule Metadata
Rule ID
4b09c71e-4269-4111-9cdd-107d8867f0cc
Status
test
Level
high
Type
Detection
Created
Mon Sep 02
Path
rules/linux/process_creation/proc_creation_lnx_flock_shell_execution.yml
Raw Tags
attack.discoveryattack.t1083