Malicious attackers have notably stepped up attacks on the U.S. auto industry since late year, hitting car manufacturers with ransomware, compromising their systems, and exfiltrating their data, the FBI reportedly warned this week.

CNN on Wednesday reported that the FBI alert came in the form of a private bulletin sent to a select group of companies, advising them that bad actors are trying to leverage network vulnerabilities and techniques such as brute forcing and phishing to access and infiltrate their networks.

Several campaigns have already been successful, the FBI noted, according to the CNN report. For instance, attackers have accessed employee email accounts at multiple companies, and then created new mailbox rules to ensure that sensitive messages are automatically forwarded to attacker-controlled external email addresses.

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