Sigma rule: Suspicious Scripting in a WMI Consumer

Rule

Title

Suspicious Scripting in a WMI Consumer

Status

test

Level

high

Author

Florian Roth (Nextron Systems), Jonhnathan Ribeiro

Date

2019-04-15

Modified

2023-09-09

File

rules/windows/wmi_event/sysmon_wmi_susp_scripting.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious commands that are related to scripting/powershell in WMI Event Consumers

Log source

product

windows

category

wmi_event

Detection

selection_destination:
    - Destination|contains|all:
          - 'new-object'
          - 'net.webclient'
          - '.downloadstring'
    - Destination|contains|all:
          - 'new-object'
          - 'net.webclient'
          - '.downloadfile'
    - Destination|contains:
          - ' iex('
          - ' -nop '
          - ' -noprofile '
          - ' -decode '
          - ' -enc '
          - 'WScript.Shell'
          - 'System.Security.Cryptography.FromBase64Transform'
condition: selection_destination

False positives (as the rule lists them)

• Legitimate administrative scripts

Tags

• attack.execution
• attack.t1059.005

MITRE ATT&CK ids this rule names

• T1059.005

References

• https://in.security/an-intro-into-abusing-and-identifying-wmi-event-subscriptions-for-persistence/
• https://github.com/Neo23x0/signature-base/blob/615bf1f6bac3c1bdc417025c40c073e6c2771a76/yara/gen_susp_lnk_files.yar#L19
• https://github.com/RiccardoAncarani/LiquidSnake

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/wmi_event/sysmon_wmi_susp_scripting.yml