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Sources: hackers conducted a test run of the SolarWinds breach in October 2019, with a version of the malware that didn't have a backdoor embedded in it (Kim Zetter/Yahoo News)

Kim Zetter / Yahoo News:

Sources: hackers conducted a test run of the SolarWinds breach in October 2019, with a version of the malware that didn’t have a backdoor embedded in it  —  Hackers who breached federal agency networks through software made by a company called SolarWinds appear to have conducted a test run …