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The United States has found a way to permanently embed surveillance and sabotage tools in computers and networks it has targeted in Iran, Russia, Pakistan, China, Afghanistan and other countries closely watched by American intelligence agencies, according to a Russian cybersecurity firm.In a presentation of its findings at a conference in Mexico on Monday, Kaspersky Lab, the Russian firm, said that the implants had been placed by what it called the “Equation Group,” which appears to be a veiled reference to the National Security Agency and its military counterpart, United States Cyber Command.

It linked the techniques to those used in Stuxnet, the computer worm that disabled about 1,000 centrifuges in Iran’s nuclear enrichment program. It was later revealed that Stuxnet was part of a program code-named Olympic Games and run jointly by Israel and the United States.Kaspersky’s report said that Olympic Games had similarities to a much broader effort to infect computers well beyond those in Iran. It detected particularly high infection rates in computers in Iran, Pakistan and Russia, three countries whose nuclear programs the United States routinely monitors.

Some of the implants burrow so deep into the computer systems, Kaspersky said, that they infect the “firmware,” the embedded software that preps the computer’s hardware before the operating system starts. It is beyond the reach of existing antivirus products and most security controls, Kaspersky reported, making it virtually impossible to wipe out.

The U.S. Department of Justice is pushing to make it easier for law enforcement to get warrants to hack into the computers of criminal suspects across the country. The move, which would alter federal court rules governing search warrants, comes amid increases in cases related to computer crimes. Investigators say they need more flexibility to get warrants to allow hacking in such cases, especially when multiple computers are involved or the government doesn’t know where the suspect’s computer is physically located. The Justice Department effort is raising questions among some technology advocates, who say the government should focus on fixing the holes in computer software that allow such hacking instead of exploiting them. Privacy advocates also warn government spyware could end up on innocent people’s computers if remote attacks are authorized against equipment whose ownership isn’t clear.

The government’s push for rule changes sheds light on law enforcement’s use of remote hacking techniques, which are being deployed more frequently but have been protected behind a veil of secrecy for years. In documents submitted by the government to the judicial system’s rule-making body this year, the government discussed using software to find suspected child pornographers who visited a U.S. site and concealed their identity using a strong anonymization tool called Tor. The government’s hacking tools—such as sending an email embedded with code that installs spying software — resemble those used by criminal hackers. The government doesn’t describe these methods as hacking, preferring instead to use terms like “remote access” and “network investigative techniques.” Right now, investigators who want to search property, including computers, generally need to get a warrant from a judge in the district where the property is located, according to federal court rules. In a computer investigation, that might not be possible, because criminals can hide behind anonymizing technologies. In cases involving botnets—groups of hijacked computers—investigators might also want to search many machines at once without getting that many warrants.

Some judges have already granted warrants in cases when authorities don’t know where the machine is. But at least one judge has denied an application in part because of the current rules. The department also wants warrants to be allowed for multiple computers at the same time, as well as for searches of many related storage, email and social media accounts at once, as long as those accounts are accessed by the computer being searched. “Remote searches of computers are often essential to the successful investigation” of computer crimes, Acting Assistant Attorney General Mythili Raman wrote in a letter to the judicial system’s rulemaking authority requesting the change in September. The government tries to obtain these “remote access warrants” mainly to “combat Internet anonymizing techniques,” the department said in a memo to the authority in March. Some groups have raised questions about law enforcement’s use of hacking technologies, arguing that such tools mean the government is failing to help fix software problems exploited by criminals. “It is crucial that we have a robust public debate about how the Fourth Amendment and federal law should limit the government’s use of malware and spyware within the U.S.,” said Nathan Wessler, a staff attorney at the American Civil Liberties Union who focuses on technology issues.