The system.img (or system_other.img) is a raw ext4 or EROFS filesystem. Within this IMG, the systemarm32 directories are laid out. The build system decides at compile time whether to generate a monolithic system.img or a split one (e.g., system.img for 64-bit, vendor.img for 32-bit proprietary HALs).
Storage space is precious. A full set of 32-bit and 64-bit libraries can bloat the system partition by over 200MB. To mitigate this, Android uses XZ compression extensively.
Red team tools and malware frequently combine multiple architectures to increase survivability. The string could represent an obfuscated file path or registry value: systemarm32binder64abimgxz
"ab" could stand for Android Backup (.ab files are Android backup archives), or simply be a separator. Android backup files are compressed (often with deflate) and can contain application data, system settings, or even malicious content. When paired with imgxz, it suggests an Android backup that contains a disk image.
If you encounter a file named systemarm32binder64abimgxz, follow these steps: The system
"64" signifies 64-bit architecture (x86-64 or ARM64). The juxtaposition of arm32 and 64 is unusual. It might indicate:
Also known as Seamless Updates, the A/B partitioning scheme maintains two sets of system partitions (Slot A and Slot B). For systemarm32, this means: When an OTA update switches the bootloader to
When an OTA update switches the bootloader to the other slot, the system can change the entire 32/64-bit personality of the device without a factory reset.