Android's New Sideloading Friction: 24-Hour Waits and Verification Mandates
Has anyone started digging into the implementation details of Google's new 'advanced flow' for sideloading? Google announced a mandatory 24-hour wait period for apps from unverified developers. While this is a solid move to curb the rising tide of banking trojans and scam apps targeting the average user, it introduces some friction for our internal testing workflows.
Technically, this targets the PackageInstaller behavior when the source isn't a verified Play Store developer. It essentially adds a temporal heuristic to the risk analysis before allowing the INSTALL_REQUEST to proceed. For those of us managing fleets or doing rapid prototyping without a published dev account, this 24-hour lag is going to be a pain.
I'm currently checking if we can monitor or adjust this via ADB for our test devices. You can check your current verification status using:
adb shell dumpsys package com.google.android.gms | grep 'verify_apps'
It seems like Play Protect needs to be fully enabled for this timer to trigger, but I'm worried about the edge cases where `verify_apps_over_usb` is disabled.
How are you planning to handle this for internal tooling? Are you going to formalize developer accounts for everything, or is there a workaround in the MDM/Enterprise policies I'm missing?
From a SOC perspective, this is a win. We've seen a massive uptick in 'trojanized' utility apps bypassing basic static analysis because users just click 'Install anyway' instantly. Adding a 24-hour delay breaks the instant gratification loop scammers rely on. For your internal apps, I'd suggest looking into the set_permission_enforcement private APIs or just biting the bullet and getting the Play Console account verified—it's only a one-time $25 fee and saves headaches later.
We are seeing this impact our red teaming already. The delay complicates 'drop-and-exec' simulations on unmanaged devices. However, for managed devices, you can likely bypass this user-facing friction by deploying via your EMM (Enterprise Mobility Management) solution. If you push the APK silently via the managed Play Store or a private channel, the 'unverified developer' risk flag shouldn't trigger the same heuristic as a web sideload. Test this query to see your installation sources:
adb shell dumpsys package packages | grep -A 5 'PackageSignatures'
I get the security intent, but this feels like security by annoyance. Sophisticated malware will just find a way to get verified using stolen identities or burner accounts (the 'verified developer' mandate has loopholes). This mostly stops the low-effort scams. For pentesting, I'm hoping there's a specific adb flag we can toggle, or we'll have to revert to older Android versions for specific test cases.
Validating the bypass for our Red Team ops: using ADB directly bypasses the UI friction entirely since it utilizes a different installer session type. If you're setting up a test environment, you can script the deployment to save time:
for device in $(adb devices | grep -v "List" | cut -f1); do adb -s $device install -r app-release.apk; done
This keeps the workflow smooth without needing to verify every test build.
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