The firms said they believed multiple gigabytes of data have been uploaded from targeted machines.
Targets of Mahdi include critical infrastructure firms, engineering students, financial services firms and government embassies located in five Middle Eastern countries, with the majority of the infections in Iran, according to the two security firms.
The bulk of the new victims were also in Iran, according to Seculert, though a few were identified in the United States and Germany.
The two firms have declined to identify specific victims.
Seculert's Raff said he suspected the campaign was being run by hacker activists, or "hactivists," who were either funded by a government or who provide information they collect to a nation for ideological reasons. He declined to say which country might be involved.
Seculert and Kaspersky dubbed the campaign Mahdi after a term referring to the prophesied redeemer of Islam because evidence suggests the attackers used a folder with that name as they developed the software to run the project.
They also included a text file named mahdi.txt in the malicious software that infected target computers.
(Editing by Cynthia Osterman and Bernadette Baum)
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