Potential Binary Proxy Execution Via Cdb.EXE — Sigma Rule

Rule metadata and linked tags

Author: Beyu Denis, oscd.community, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2019-10-26 / 2024-04-22.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0304f2c48a2acce400a1c390dc1a286954f84e54a3aec0065b792cf4a3f3438e

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Potential Binary Proxy Execution Via Cdb.EXE
id: b5c7395f-e501-4a08-94d4-57fe7a9da9d2
status: test
description: Detects usage of "cdb.exe" to launch arbitrary processes or commands from a debugger script file
references:
    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Cdb/
    - https://web.archive.org/web/20170715043507/http://www.exploit-monday.com/2016/08/windbg-cdb-shellcode-runner.html
    - https://twitter.com/nas_bench/status/1534957360032120833
author: Beyu Denis, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-26
modified: 2024-04-22
tags:
    - attack.execution
    - attack.stealth
    - attack.t1106
    - attack.t1218
    - attack.t1127
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\cdb.exe'
        - OriginalFileName: 'CDB.Exe'
    selection_cli:
        CommandLine|contains:
            - ' -c ' # Using a debugger script
            - ' -cf '
    condition: all of selection*
falsepositives:
    - Legitimate use of debugging tools
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate use of debugging tools

Source references

• https://lolbas-project.github.io/lolbas/OtherMSBinaries/Cdb/
• https://web.archive.org/web/20170715043507/http://www.exploit-monday.com/2016/08/windbg-cdb-shellcode-runner.html
• https://twitter.com/nas_bench/status/1534957360032120833