Sigma rule: DNS Query To Ufile.io - DNS Client

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-a2b561787e32, updated 2023-09-18T00:00:00.000Z.

Rule

Title
DNS Query To Ufile.io - DNS Client
Status
test
Level
low
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-01-16
Modified
2023-09-18
File
rules/windows/builtin/dns_client/win_dns_client_ufile_io.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects DNS queries to "ufile.io", which was seen abused by malware and threat actors as a method for data exfiltration

Log source

product
windows
service
dns-client
definition
Requirements: Microsoft-Windows-DNS Client Events/Operational Event Log must be enabled/collected in order to receive the events.

Detection

selection:
    EventID: 3008
    QueryName|contains: 'ufile.io'
condition: selection

False positives (as the rule lists them)

  • DNS queries for "ufile" are not malicious by nature necessarily. Investigate the source to determine the necessary actions to take

Tags

  • attack.exfiltration
  • attack.t1567.002

MITRE ATT&CK ids this rule names

Related rules

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/windows/builtin/dns_client/win_dns_client_ufile_io.yml

Sources and licences

  • SigmaHQ

    "DNS Query To Ufile.io - DNS Client" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/dns_client/win_dns_client_ufile_io.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: DNS Query To Ufile.io - DNS Client",
entity page, dataset version ref-a2b561787e32, updated 2023-09-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/090ffaad-c01a-4879-850c-6d57da98452d (accessed 2026-11-03).
Underlying source: SigmaHQ rule 090ffaad-c01a-4879-850c-6d57da98452d, 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.