Sigma rule: Flash Player Update from Suspicious Location

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-29d3374ce4bd, updated 2022-08-08T00:00:00.000Z.

Rule

Title
Flash Player Update from Suspicious Location
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2017-10-25
Modified
2022-08-08
File
rules/web/proxy_generic/proxy_susp_flash_download_loc.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a flashplayer update from an unofficial location

Log source

category
proxy

Detection

selection:
    - c-uri|contains: '/flash_install.php'
    - c-uri|endswith: '/install_flash_player.exe'
filter:
    cs-host|endswith: '.adobe.com'
condition: selection and not filter

False positives (as the rule lists them)

  • Unknown flash download locations

Tags

  • attack.initial-access
  • attack.stealth
  • attack.t1189
  • attack.execution
  • attack.t1204.002
  • attack.t1036.005

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/rules/web/proxy_generic/proxy_susp_flash_download_loc.yml

Sources and licences

  • SigmaHQ

    "Flash Player Update from Suspicious Location" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/web/proxy_generic/proxy_susp_flash_download_loc.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: Flash Player Update from Suspicious Location",
entity page, dataset version ref-29d3374ce4bd, updated 2022-08-08T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/4922a5dd-6743-4fc2-8e81-144374280997 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 4922a5dd-6743-4fc2-8e81-144374280997, 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.