Practically 1.3 million Android-based TV bins operating outdated variations of the working system and belonging to customers spanning 197 international locations have been contaminated by a brand new malware dubbed Vo1d (aka Void).
“It’s a backdoor that places its elements within the system storage space and, when commanded by attackers, is able to secretly downloading and putting in third-party software program,” Russian antivirus vendor Physician Net mentioned in a report revealed as we speak.
A majority of the infections have been detected in Brazil, Morocco, Pakistan, Saudi Arabia, Argentina, Russia, Tunisia, Ecuador, Malaysia, Algeria, and Indonesia.
It is at the moment not recognized what the supply of the an infection is, though it is suspected that it could have both concerned an occasion of prior compromise that permits for gaining root privileges or using unofficial firmware variations with built-in root entry.
The next TV fashions have been focused as a part of the marketing campaign –
- KJ-SMART4KVIP (Android 10.1; KJ-SMART4KVIP Construct/NHG47K)
- R4 (Android 7.1.2; R4 Construct/NHG47K)
- TV BOX (Android 12.1; TV BOX Construct/NHG47K)
The assault entails the substitution of the “/system/bin/debuggerd” daemon file (with the unique file moved to a backup file named “debuggerd_real”), in addition to the introduction of two new recordsdata – “/system/xbin/vo1d” and “/system/xbin/wd” – which include the malicious code and function concurrently.
“Earlier than Android 8.0, crashes had been dealt with by the debuggerd and debuggerd64 daemons,” Google notes in its Android documentation. “In Android 8.0 and better, crash_dump32 and crash_dump64 are spawned as wanted.”
Two totally different recordsdata shipped as a part of the Android working system – install-recovery.sh and daemonsu – have been modified as a part of the marketing campaign to set off the execution of the malware by beginning the “wd” module.
“The trojan’s authors in all probability tried to disguise one if its elements because the system program ‘/system/bin/vold,’ having known as it by the similar-looking title ‘vo1d’ (substituting the lowercase letter ‘l’ with the quantity ‘1’),” Physician Net mentioned.
The “vo1d” payload, in flip, begins “wd” and ensures it is persistently operating, whereas additionally downloading and operating executables when instructed by a command-and-control (C2) server. Moreover, it retains tabs on specified directories and installs the APK recordsdata that it finds in them.
“Sadly, it isn’t unusual for funds system producers to make the most of older OS variations and cross them off as extra up-to-date ones to make them extra enticing,” the corporate mentioned.
