A New Threat Hiding in Plain Sight
Security researchers have uncovered a dangerous Android malware variant, Android. Backdoor. 9.1.6. origin, that pretends to be a legitimate antivirus app. Distributed under the name GuardCB, it mimics the logo of the Central Bank of Russia to gain trust.
Unlike traditional malware spread through app stores, this fake antivirus is delivered via encrypted private messaging services, directly targeting business executives and high-value individuals.
Fake Antivirus with a False Sense of Security
Once installed, GuardCB behaves like a real security tool. It shows system scans and generates fake results, detecting between one and three “threats.” The longer a device remains unchecked, the more detections appear—though never more than 30 percent.
This tactic creates the illusion of protection while the malware quietly works in the background.
What the Backdoor Really Does
Beneath its fake interface, the malware requests extensive permissions, including:
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Access to SMS messages, calls, and contacts
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Location tracking and microphone recording
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Camera control and screen capture
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Device administrator and Accessibility Service rights
With these permissions, attackers can:
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Collect call logs and text messages
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Stream live audio and video
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Steal stored files and images
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Execute arbitrary commands remotely
Researchers note that it runs persistent background services that check every minute to ensure the malware stays active, reconnecting to its control servers whenever needed.
A Strong Self-Defense Mechanism
The backdoor is built to resist removal. By abusing the Accessibility Service, it can:
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Overlay fake system screens to block uninstall attempts
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Restart itself after a reboot or force-stop
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Disable genuine security features
This persistence makes it extremely difficult for victims to remove without expert help.
How It Infects Devices
Unlike malware that exploits software vulnerabilities, Android. Backdoor. 9.1.6. origin relies on social engineering and sideloading. Victims are tricked into installing the APK file delivered in private chats.
The app’s manifest file registers background services and hooks into the Accessibility Service, enabling keystroke logging and in-app data harvesting. Even after a reboot, the malware survives and continues to collect data silently.
Resilient Infrastructure
The malware uses a dynamic configuration that can connect to as many as 15 different hosting providers. Even when security teams take down some domains, backup servers keep the operation alive.
This resilience makes it challenging for defenders to completely dismantle its infrastructure.
Why This Matters
Although most infections reported so far have focused on Russian business executives, the techniques used in this campaign could easily spread to other regions.
For organizations and high-value individuals, this highlights the importance of:
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Avoiding sideloaded apps or APK files shared via private messages
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Restricting device permissions to only trusted apps
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Using mobile security tools capable of detecting advanced threats
Researchers confirm that Dr.Web antivirus for Android detects and removes known variants, but the tailored nature of the attacks shows that executives and sensitive industries remain prime targets.
Final Thoughts
Android. Backdoor. 9.1.6.origin is a reminder that the most dangerous malware often wears a disguise. By posing as protection software, it flips trust against the user and exploits the weakest link—human decision-making.
For business leaders and security professionals, vigilance is no longer optional. Mobile devices hold the keys to corporate data, and attackers know it.
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