Bitdefender warns that a Meta malvertising campaign has expanded to Android phones. The research discovered malicious ads that offer a free TradingView Premium app for Android. Rather than leading users to a legitimate software, however, these ads take victims to a sophisticated crypto-stealing trojan, which the research as "an evolved version of the Brokewell malware." The research's most recent analysis revealed the campaign remains active and has leveraged at least 75 malicious ads since mid-July.
Upon execution, a backdoor known as Oyster/Broomstick is installed. Persistence is established by creating a scheduled task that runs every three minutes, executing a malicious DLL (twain_96.dll) via rundll32.exe using the DllRegisterServer export.