{"id":"e328cc73-f92a-42fb-b3fa-7c2cffda981a","title":"Curl File Upload To File Sharing Websites","description":"Detects usage of curl to upload files to known file sharing domains, which may indicate data exfiltration.","author":"Swachchhanda Shrawan Poudel (Nextron Systems)","status":"experimental","level":"high","date":"2026-03-29","modified":"","tags":["attack.exfiltration","attack.t1567.002"],"technique_ids":["T1567.002"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Legitimate file uploads to these services by administrators or developers"],"references":["https://unit42.paloaltonetworks.com/advanced-backdoor-squidoor/"],"source_path":"rules/windows/process_creation/proc_creation_win_curl_upload_file_sharing_websites.yml","source_sha256":"aa31fa0710c9f48a9b6e2a70344938496fc5eca582f2907d890b75c30244963b","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_curl_upload_file_sharing_websites.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Curl File Upload To File Sharing Websites\nid: e328cc73-f92a-42fb-b3fa-7c2cffda981a\nrelated:\n    - id: 00bca14a-df4e-4649-9054-3f2aa676bc04\n      type: derived\n    - id: 7d1aaf3d-4304-425c-b7c3-162055e0b3ab\n      type: similar\nstatus: experimental\ndescription: Detects usage of curl to upload files to known file sharing domains, which may indicate data exfiltration.\nauthor: Swachchhanda Shrawan Poudel (Nextron Systems)\nreferences:\n    - https://unit42.paloaltonetworks.com/advanced-backdoor-squidoor/\ndate: 2026-03-29\ntags:\n    - attack.exfiltration\n    - attack.t1567.002\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - Image|endswith: '\\curl.exe'\n        - OriginalFileName: 'curl.exe'\n    selection_cli_domain:\n        CommandLine|contains:\n            - '0x0.st'\n            - 'bashupload.com'\n            - 'chunk.io'\n            - 'file.io'\n            - 'filebin.net'\n            - 'pastebin'\n            - 'send.firefox.com'\n            - 'temp.sh'\n            - 'transfer.sh'\n            - 'ufile.io'\n            - 'uploadfiles.io'\n            - 'wetransfer.com'\n            - 'x0.at'\n    selection_cli_flags:\n        - CommandLine|contains:\n              - ' --form'\n              - ' --upload-file'\n              - ' --data'\n              - ' -X POST'\n              - ' --request POST '\n        - CommandLine|re:\n              - '\\s-[FTd]\\s' # We use regex to ensure a case sensitive argument detection\n              - '\\s-sT\\s'\n    condition: all of selection_*\nfalsepositives:\n    - Legitimate file uploads to these services by administrators or developers\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1567.002","id":"T1567.002","name":"Exfiltration to Cloud Storage","page":"techniques/enterprise/T1567.002/"}],"data_path":"data/detection-rules/e328cc73-f92a-42fb-b3fa-7c2cffda981a.json","kind":"sigma"}