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Fake Windows 10 Updates Infect you with Magniber Ransomware

Fake Windows 10 Updates Infect you with Magniber Ransomware

Fake Windows 10 updates are being used to distribute the Magniber ransomware in a massive campaign that started earlier this month.

Over the past few days, BleepingComputer has received a surge of requests for help regarding a ransomware infection targeting users worldwide.

While researching the campaign, we discovered a topic in our forums where readers report becoming infected by the Magniber ransomware after installing what is believed to be Windows 10 cumulative or security update.

These updates are distributed under various names, with Win10.0_System_Upgrade_Software.msi [VirusTotal] and Security_Upgrade_Software_Win10.0.msi being the most common.

Other downloads pretend to be Windows 10 cumulative updates, using fake knowledge base articles, as shown below.

Also Read: The impact of GDPR and PDPA in Singapore

System.Upgrade.Win10.0-KB47287134.msi
System.Upgrade.Win10.0-KB82260712.msi
System.Upgrade.Win10.0-KB18062410.msi
System.Upgrade.Win10.0-KB66846525.msi

Based on the submissions to VirusTotal, this campaign appears to have started on April 8th, 2022 and has seen massive distribution worldwide since then.

While it’s not 100% clear how the fake Windows 10 updates are being promoted, the downloads are distributed from fake warez and crack sites.

Fake warez and crack sites pushing Magniber
Fake warez and crack sites pushing Magniber
Source: BleepingComputer

Once installed, the ransomware will delete shadow volume copies and then encrypt files. When encrypting files, the ransomware will append a random 8-character extension, such as .gtearevf, as shown below.

Files encrypted by Magniber
Files encrypted by Magniber
Source: BleepingComputer

The ransomware also creates ransom notes named README.html in each folder that contains instructions on how to access the Magniber Tor payment site to pay a ransom.

Magniber ransom note
Magniber ransom note
Source: BleepingComputer

The Magniber payment site is titled ‘My Decryptor’ and will allow a victim to decrypt one file for free, contact ‘support,’ or determine the ransom amount and bitcoin address victims should make a payment.

Also Read: Free 8 Steps Checklist for Companies to Prevent Data Breach

Magniber Tor payment site
Magniber Tor payment site
Source: BleepingComputer

From payment pages seen by BleepingComputer, most ransom demands have been approximately $2,500 or 0.068 bitcoins.

Magniber is considered secure, meaning that it does not contain any weaknesses that can be exploited to recover files for free.

Unfortunately, this campaign primarily targets students and consumers rather than enterprise victims, causing the ransom demand to be too expensive for many victims.

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