File Download Via Bitsadmin
A Sigma rule for process creation on Windows, by Michael Haag, FPT.EagleEye.
medium 3 ATT&CK techniques 1 program it names 2 everyday examples trip it
What it looks for
detection:
selection_cli_1:
CommandLine|contains:
- ' /create '
- ' /addfile '
selection_cli_2:
CommandLine|contains: 'http'
selection_cmd:
CommandLine|contains: ' /transfer '
selection_img:
- Image|endswith: '\bitsadmin.exe'
- OriginalFileName: 'bitsadmin.exe'
condition: selection_img and (selection_cmd or all of selection_cli_*)
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 Michael Haag, FPT.EagleEye, 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.
Command lines that trip it
To add a file to the job on the page for bitsadmin addfile
bitsadmin /addfile myDownloadJob http://downloadsrv/10mb.zip c:\10mb.zipIdentifyTo start a transfer job named myDownloadJob on the page for bitsadmin transfer
bitsadmin /transfer myDownloadJob http://prodserver/audio.wma c:\downloads\audio.wmaIdentifyThe commands LOLBAS or GTFOBins documents for bitsadmin.exe trip it too: each is on its program’s page, read by CmdID.