Sigma rule: Vulnerable Dell BIOS Update Driver Load

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-0dd32a001a9f, updated 2023-09-12T00:00:00.000Z.

SigmaHQ marks this rule as deprecated.

Rule

Title
Vulnerable Dell BIOS Update Driver Load
Status
deprecated
Level
high
Author
Florian Roth (Nextron Systems)
Date
2021/05/05
Modified
2023/09/12
File
deprecated/windows/driver_load_win_vuln_dell_driver.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the load of the vulnerable Dell BIOS update driver as reported in CVE-2021-21551

Log source

product
windows
category
driver_load

Detection

selection_image:
    ImageLoaded|contains: '\DBUtil_2_3.Sys'
selection_sysmon:
    Hashes|contains:
        - 'SHA256=0296E2CE999E67C76352613A718E11516FE1B0EFC3FFDB8918FC999DD76A73A5'
        - 'SHA256=DDBF5ECCA5C8086AFDE1FB4F551E9E6400E94F4428FE7FB5559DA5CFFA654CC1'
        - 'SHA1=C948AE14761095E4D76B55D9DE86412258BE7AFD'
        - 'SHA1=10B30BDEE43B3A2EC4AA63375577ADE650269D25'
        - 'MD5=C996D7971C49252C582171D9380360F2'
        - 'MD5=D2FD132AB7BBC6BBB87A84F026FA0244'
condition: 1 of selection*

False positives (as the rule lists them)

  • Legitimate BIOS driver updates (should be rare)

Tags

  • attack.privilege_escalation
  • cve.2021.21551
  • attack.t1543
  • attack.t1068

CVEs this rule names

MITRE ATT&CK ids this rule names

References

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

Sources and licences

  • SigmaHQ

    "Vulnerable Dell BIOS Update Driver Load" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/deprecated/windows/driver_load_win_vuln_dell_driver.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Vulnerable Dell BIOS Update Driver Load",
entity page, dataset version ref-0dd32a001a9f, updated 2023-09-12T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/21b23707-60d6-41bb-96e3-0f0481b0fed9 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 21b23707-60d6-41bb-96e3-0f0481b0fed9, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.