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CmdID / Rules / Windows

Cloudflared Quick Tunnel Execution

A Sigma rule for process creation on Windows, by Sajid Nawaz Khan.

medium 1 ATT&CK technique

What it looks for

its detection, as SigmaHQ writes it
detection:
  selection_img:
    - Image|endswith:
        - '\cloudflared.exe'
        - '\cloudflared-windows-386.exe'
        - '\cloudflared-windows-amd64.exe'
    - Hashes|contains:
        - 'SHA256=2fb6c04c4f95fb8d158af94c137f90ac820716deaf88d8ebec956254e046cb29'
        - 'SHA256=b3d21940a10fdef5e415ad70331ce257c24fe3bcf7722262302e0421791f87e8'
        - 'SHA256=1fbd8362b2d2d2e6a5750ae3db69cd1815e6c1d31da48a98b796450971a8e039'
        - 'SHA256=0409c9b12f9d0eda86e461ed9bdabeefb00172b26322079681a0bdf48e68dc28'
        - 'SHA256=7cfb411d04bac42ef93d1f0c93c0a481e38c6f4612b97ae89d4702595988edc7'
        - 'SHA256=5b3c2d846ab162dc6bc595cce3a49de5731afde5d6060be7066d21b013a28373'
        - 'SHA256=ce95df7f69664c3df19b76028e115931919a71517b776da7b42d353e2ff4a670'
        - 'SHA256=1293525a19cfe3bc8296b62fbfe19f083632ed644a1c18c10b045a1d3030d81a'
        - 'SHA256=af2b9161cfcb654b16408cd6b098afe9d1fb61a037d18d7090a119d4c0c8e0f0'
        - 'SHA256=39ddceb56a15798826a5fc4892fa2b474c444bb4d7a8bf2fa95e41cab10fa7a1'
        - 'SHA256=ccd11f2328023a0e7929e845d5b6e7bc783fb4650d65faef3ae090239d4bbce2'
        - 'SHA256=b6e5c5d2567ae8c69cc012ebcae30e6c9b5359d64a58d17ba75ec89f8bce71ac'
        - 'SHA256=f813484ea441404f18caad96f28138e8aaf0cb256163c09c2ab8a3acab87f69f'
        - 'SHA256=fc4a0802ab9c7409b892ca00636bec61e2acfc911bccfdeb9978b8ab5a2f828d'
        - 'SHA256=083150724b49604c8765c1ba19541fa260b133be0acb0647fcd936d81f054499'
        - 'SHA256=44303d6572956f28a0f2e4b188934fb9874f2584f5c81fa431a463cfbf28083b'
        - 'SHA256=5d38c46032a58e28ae5f7d174d8761ec3d64d186677f3ec53af5f51afb9bfd2f'
        - 'SHA256=e1e70fa42059911bc6685fafef957f9a73fc66f214d0704a9b932683a5204032'
        - 'SHA256=c01356092a365b84f84f0e66870bd1a05ba3feb53cafd973fa5fea2534bee234'
        - 'SHA256=b3f9c06151e30ee43d39e788a79cd918a314f24e04fe87f3de8272a2057b624f'
        - 'SHA256=cd81b2792f0739f473c31c9cb7cf2313154bfa28b839975802b90e8790bb5058'
        - 'SHA256=9ec7e6c8e1bfd883663d8d9d62c9e4f9ae373b731407181e32491b27a7218a2c'
        - 'SHA256=c2cfd23fdc6c0e1b1ffa0e545cbe556f18d11b362b4a89ba0713f6ab01c4827f'
        - 'SHA256=53f8adbd76c0eb16f5e43cadde422474d8a06f9c8f959389c1930042ad8beaa5'
        - 'SHA256=648c8d2f8001c113d2986dd00b7bbd181593d462bef73522cee212c4f71f95b3'
        - 'SHA256=ae047e2095e46c3f9c518b2be67ec753f4f0aad23b261a361fcb6144dcdb63b4'
        - 'SHA256=3153d2baa462978dd22ab33d1c2274ecc88c200225d6a3327f98d5b752d08f5c'
        - 'SHA256=f49cde976e628012c9db73e1c8d76081944ecf2297cdafeb78bb13290da274c4'
        - 'SHA256=d2513e58bb03ccc83affde685c6ef987924c37ce6707d8e9857e2524b0d7e90f'
        - 'SHA256=bb67c7623ba92fe64ffd9816b8d5b3b1ea3013960a30bd4cf6e295b3eb5b1bad'
        - 'SHA256=b34b3c3a91e3165d1481f0b3ec23eab93a1cfba94345a6cbfe5b18ddbd48eac7'
        - 'SHA256=f7848034e010d55f15e474ca998f96391e320ff29b00cfcc4c5e536529703e75'
        - 'SHA256=b6fc9493778cbe3bfc062d73f5cc604bc0ff058bc5e5dc6aac87f3a4008b54b6'
        - 'SHA256=f5c5e962577e2293c4ad10603816dce7cc273585969615fbf4e4bfa9eaff1688'
        - 'SHA256=d14c52d9220b606f428a8fe9f7c108b0d6f14cf71e7384749e98e6a95962e68f'
        - 'SHA256=d3a0e1a79158f3985cd49607ebe0cdfcc49cb9af96b8f43aefd0cdfe2f22e663'
        - 'SHA256=2fbbfc8299537ff80cadf9d0e27c223fe0ccb9052bf9d8763ad717bbfa521c77'
        - 'SHA256=19074674c6fbdaa573b3081745e5e26144fdf7a086d14e0e220d1814f1f13078'
  selection_other:
    CommandLine|contains|all:
      - '-url'
      - '-no-autoupdate'
  selection_param:
    - CommandLine|contains|all:
        - '-url'
        - 'tunnel'
    - CommandLine|contains:
        - '.exe -url'
        - '.exe --url'
  condition: (selection_img and selection_param) or selection_other

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Sajid Nawaz Khan, under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.

None of the everyday examples and documented commands on CmdID’s program pages trips it. To see whether a command line does, paste it into CmdID.

ATT&CK

the techniques it is tagged with
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