Several groups with ties to Iran have ramped up their online influence campaigns targeting the United States ahead of November’s election, according to a new report from Microsoft’s Threat Analysis Center.

One group, Mint Sandstorm, which is run by the Islamic Revolutionary Guard Corps intelligence unit, sent a spear phishing email to a high-ranking official on a presidential campaign from a compromised email account of a former senior adviser. Microsoft did not identify which campaign it notified.