I have only seen this used by red teamers. I am not aware of current attacks using BITSAdmin to upload stuff. I am also not aware of built-in (Windows) use either. Lab-generated pcap is available.
# Date: 2018-05-16
# Title: BITSAdmin File Upload
# Reference: Research
# Tests: pcap
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"INDICATOR-COMPROMISE Windows BITSAdmin upload request attempt"; flow:to_server,established; content:"BITS_POST"; http_method; content:"User-Agent: Microsoft BITS/"; fast_pattern:only; http_header; metadata:ruleset community, service http; classtype:misc-activity; sid:8000057; rev:1;)
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