title: Potential Abuse of Linux Magic System Request Key
id: ea61bb82-a5e0-42e6-8537-91d29500f1b9
status: experimental
description: |
    Detects the potential abuse of the Linux Magic SysRq (System Request) key by adversaries with root or sufficient privileges
    to silently manipulate or destabilize a system. By writing to /proc/sysrq-trigger, they can crash the system, kill processes,
    or disrupt forensic analysis—all while bypassing standard logging. Though intended for recovery and debugging, SysRq can be
    misused as a stealthy post-exploitation tool. It is controlled via /proc/sys/kernel/sysrq or permanently through /etc/sysctl.conf.
references:
    - https://www.kernel.org/doc/html/v4.10/_sources/admin-guide/sysrq.txt
    - https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/4/html/reference_guide/s3-proc-sys-kernel
    - https://www.splunk.com/en_us/blog/security/threat-update-awfulshred-script-wiper.html
author: Milad Cheraghi
date: 2025-05-23
tags:
    - attack.execution
    - attack.t1059.004
    - attack.impact
    - attack.t1529
    - attack.t1489
    - attack.t1499
logsource:
    product: linux
    service: auditd
    definition: |
        Required auditd configuration:
        -w /proc/sysrq-trigger -p wa -k sysrq
        -w /proc/sys/kernel/sysrq -p wa -k sysrq
detection:
    selection:
        type: 'PATH'
        name|endswith:
            # Enable
            - '/sysrq'
            - '/sysctl.conf'
            # Execute
            - '/sysrq-trigger'
    condition: selection
falsepositives:
    - Legitimate administrative activity
level: medium

title: File Time Attribute Change - Linux
id: b3cec4e7-6901-4b0d-a02d-8ab2d8eb818b
status: test
description: Detect file time attribute change to hide new or changes to existing files.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.006/T1070.006.md
author: 'Igor Fits, oscd.community'
date: 2020-10-15
modified: 2022-11-28
tags:
    - attack.stealth
    - attack.t1070.006
logsource:
    product: linux
    service: auditd
detection:
    execve:
        type: 'EXECVE'
    touch:
        - 'touch'
    selection2:
        - '-t'
        - '-acmr'
        - '-d'
        - '-r'
    condition: execve and touch and selection2
falsepositives:
    - Unknown
level: medium
simulation:
    - type: atomic-red-team
      name: Set a file's access timestamp
      technique: T1070.006
      atomic_guid: 5f9113d5-ed75-47ed-ba23-ea3573d05810
    - type: atomic-red-team
      name: Set a file's modification timestamp
      technique: T1070.006
      atomic_guid: 20ef1523-8758-4898-b5a2-d026cc3d2c52
    - type: atomic-red-team
      name: Modify file timestamps using reference file
      technique: T1070.006
      atomic_guid: 631ea661-d661-44b0-abdb-7a7f3fc08e50