title: ASLR Disabled Via Sysctl or Direct Syscall - Linux
id: e497a24e-9345-4a62-9803-b06d7d7cb132
status: experimental
description: |
    Detects actions that disable Address Space Layout Randomization (ASLR) in Linux, including:
      - Use of the `personality` syscall with the ADDR_NO_RANDOMIZE flag (0x0040000)
      - Modification of the /proc/sys/kernel/randomize_va_space file
      - Execution of the `sysctl` command to set `kernel.randomize_va_space=0`
    Disabling ASLR is often used by attackers during exploit development or to bypass memory protection mechanisms.
    A successful use of these methods can reduce the effectiveness of ASLR and make memory corruption attacks more reliable.
references:
    - https://github.com/CheraghiMilad/bypass-Neo23x0-auditd-config/blob/f1c478a37911a5447d5ffcd580f22b167bf3df14/personality-syscall/README.md
    - https://man7.org/linux/man-pages/man2/personality.2.html
    - https://manual.cs50.io/2/personality
    - https://linux-audit.com/linux-aslr-and-kernelrandomize_va_space-setting/
author: Milad Cheraghi
date: 2025-05-26
modified: 2025-12-05
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.defense-impairment
    - attack.t1685
    - attack.t1055.009
logsource:
    product: linux
    service: auditd
detection:
    selection_syscall:
        type: 'SYSCALL'
        SYSCALL: 'personality'
        a0: 40000
    selection_sysctl:
        type: 'EXECVE'
        a0: 'sysctl'
        a1: '-w'
        a2: 'kernel.randomize_va_space=0' # 0 = disable
    condition: 1 of selection_*
falsepositives:
    - Debugging or legitimate software testing
level: high

title: Potential Linux Process Code Injection Via DD Utility
id: 4cad6c64-d6df-42d6-8dae-eb78defdc415
status: test
description: Detects the injection of code by overwriting the memory map of a Linux process using the "dd" Linux command.
references:
    - https://www.aon.com/cyber-solutions/aon_cyber_labs/linux-based-inter-process-code-injection-without-ptrace2/
    - https://github.com/AonCyberLabs/Cexigua/blob/34d338620afae4c6335ba8d8d499e1d7d3d5d7b5/overwrite.sh
author: Joseph Kamau
date: 2023-12-01
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1055.009
logsource:
    product: linux
    category: process_creation
detection:
    selection:
        Image|endswith: '/dd'
        CommandLine|contains|all:
            - 'of='
            - '/proc/'
            - '/mem'
    condition: selection
falsepositives:
    - Unknown
level: medium