Sigma rule: Network Communication Initiated To File Sharing Domains From Process Located In Suspicious Folder

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-96daba53f427, updated 2026-03-29T00:00:00.000Z.

Rule

Title: Network Communication Initiated To File Sharing Domains From Process Located In Suspicious Folder
Status: test
Level: high
Author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Date: 2018-08-30
Modified: 2026-03-29
File: rules/windows/network_connection/net_connection_win_susp_file_sharing_domains_susp_folders.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects executables located in potentially suspicious directories initiating network connections towards file sharing domains.

Log source

product: windows
category: network_connection

Detection

selection_paths:
    Image|contains:
        - ':\$Recycle.bin'
        - ':\Perflogs\'
        - ':\Temp\'
        - ':\Users\Default\'
        - ':\Users\Public\'
        - ':\Windows\Fonts\'
        - ':\Windows\IME\'
        - ':\Windows\System32\Tasks\'
        - ':\Windows\Tasks\'
        - ':\Windows\Temp\'
        - '\AppData\Temp\'
        - '\config\systemprofile\'
        - '\Windows\addins\'
selection_domains:
    Initiated: 'true'
    DestinationHostname|endswith:
        - '.githubusercontent.com'       # Includes both gists and github repositories / Michael Haag (idea)
        - '0x0.st'
        - 'anonfiles.com'
        - 'bashupload.com'
        - 'cdn.discordapp.com'
        - 'chunk.io'
        - 'ddns.net'
        - 'dl.dropboxusercontent.com'
        - 'ghostbin.co'
        - 'github.com'
        - 'glitch.me'
        - 'gofile.io'
        - 'hastebin.com'
        - 'mediafire.com'
        - 'mega.co.nz'
        - 'mega.nz'
        - 'onrender.com'
        - 'pages.dev'
        - 'paste.ee'
        - 'pastebin.com'
        - 'pastebin.pl'
        - 'pastetext.net'
        - 'pixeldrain.com'
        - 'privatlab.com'
        - 'privatlab.net'
        - 'send.exploit.in'
        - 'sendspace.com'
        - 'storage.googleapis.com'
        - 'storjshare.io'
        - 'supabase.co'
        - 'temp.sh'
        - 'transfer.sh'
        - 'trycloudflare.com'
        - 'ufile.io'
        - 'w3spaces.com'
        - 'workers.dev'
        - 'x0.at'
condition: all of selection_*

False positives (as the rule lists them)

Some installers located in the temp directory might communicate with the Github domains in order to download additional software. Baseline these cases or move the github domain to a lower level hunting rule.

MITRE ATT&CK ids this rule names

T1105

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/network_connection/net_connection_win_susp_file_sharing_domains_susp_folders.yml

Sources and licences

SigmaHQ
"Network Communication Initiated To File Sharing Domains From Process Located In Suspicious Folder" by Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/network_connection/net_connection_win_susp_file_sharing_domains_susp_folders.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: Network Communication Initiated To File Sharing Domains From Process Located In Suspicious Folder",
entity page, dataset version ref-96daba53f427, updated 2026-03-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e0f8ab85-0ac9-423b-a73a-81b3c7b1aa97 (accessed 2026-11-03).
Underlying source: SigmaHQ rule e0f8ab85-0ac9-423b-a73a-81b3c7b1aa97, 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.