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Attackers are abusing the Windows Background Intelligent Transfer Service (BITS) to re-infect computers with malware after the machines have been already cleaned by antivirus products.
The technique was observed in the wild last month by researchers from SecureWorks while responding to a malware incident for a customer. The antivirus software installed on a compromised computer detected and removed a malware program, but the computer was still showing signs of malicious activity at the network level.
Upon further investigation, the researchers found two rogue jobs registered in BITS, a Windows service that's used by the OS and other apps to download updates or transfer files. The two malicious jobs periodically downloaded and attempted to reinstall the deleted malware.
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