Malware found preinstalled on 38 Android phones used by 2 companies

A commercial malware scanner used by businesses has recently detected an outbreak of malware that came preinstalled on more than three dozen Android devices.

An assortment of malware was found on 38 Android devices belonging to two unidentified companies.Point Software Technologies, maker of a mobile threat prevention app. The malicious apps weren’t part of the official ROM firmware supplied by the phone manufacturers but were added later somewhere along the supply chain. In six of the cases, the malware was installed to the ROM using system privileges, a technique that requires the firmware to be completely reinstalled for the phone to be disinfected.

“This finding proves that, even if a user is extremely careful, never clicks a malicious link, or downloads a fishy app, he can still be infected by malware without even knowing it,” Check Point Mobile Threat Researcher Daniel Padon told Ars. “This should be a concern for all mobile users.”

Most of the malicious apps were info stealers and programs that displayed ads on the phones. One malicious ad-display app, dubbed “Loki,” gains powerful system privileges on the devices it infects. Another app was a mobile ransomware title known as “Slocker,” which uses Tor to conceal the identity of its operators.

The infected devices included:

  • Galaxy Note 2
  • LG G4
  • Galaxy S7
  • Galaxy S4
  • Galaxy Note 4
  • Galaxy Note 5
  • Galaxy Note 8
  • Xiaomi Mi 4i
  • Galaxy A5
  • ZTE x500
  • Galaxy Note 3
  • Galaxy Note Edge
  • Galaxy Tab S2
  • Galaxy Tab 2
  • Oppo N3
  • vivo X6 plus
  • Asus Zenfone 2
  • LenovoS90
  • OppoR7 plus
  • Xiaomi Redmi
  • Lenovo A850

Check Point didn’t disclose the names of the companies that owned the infected phones.  An earlier version of the Check Point blog post included Nexus 5 and Nexus 5x, but those models were removed without explanation in an update made over the weekend.

Padon said it’s not clear if the two companies were specifically targeted or if the infections were part of a broader, more opportunistic campaign. The presence of ransomware and other easy-to-detect malware seems to suggest the latter. Check Point also doesn’t know where the infected phones were obtained. One of the affected parties was a “large telecommunications company” and the other was a “multinational technology company.”

Malware Found Preinstalled on Dozens of Android Phones

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