Researchers discovered a new Sodin Ransomware (also known as Sodinokibi) that exploits the Windows Elevation privilege vulnerability resides in the Win32k component.

Sodin ransomware initial attack spotted in April 2019 when it was distributed through an Oracle Weblogic vulnerability to attack MSP providers.

Now it turns into a new form of attack by exploiting the Windows vulnerability, and targeting victims were located in the Asia-Pacific region: Taiwan, Hong Kong, and South Korea.

Researchers named the ransomware as Trojan-Ransom.Win32.Sodin that is using the vulnerability (CVE-2018-8453) in Win32k to escalate the highest level of privileges.

The vulnerability initially reported by Kaspersky and the Microsoft fixed this vulnerability was fixed on August 17, 2018.

An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode then install programs, view, change, or delete data; or create new accounts with full user rights.

Sodin Ransomware Infection Process

Attackers configured the initial stage of Trojan distributed with encrypted form and the configuration block containing the settings and data.

Attackers employed the Salsa20 symmetric stream algorithm to encrypt the victim’s files and the keys for it with an elliptic curve asymmetric algorithm.

According to Kaspersky research, “Once the Trojan gets launched, it generates a new pair of elliptic curve session keys, in which the public key of this pair is saved in the registry under the name pk_key and the private key is encrypted using the ECIES algorithm  and stored in the registry under the name sk_key.”

Once the Sodin Ransomware starts the encryption process, it will generate the new paid of elliptic curve asymmetric keys, and the symmetric key will encrypt the victims file contents with the Salsa20 algorithm.

After the ransomware completely encryption the files, the new extension will be applied in each file and the ransom note is saved next to it while malware-generated wallpaper is set on the desktop.

Meanwhile, behalf of network communication, Trojan sends information about the infected machine to the attacker’s command and control server and the sending data is also encrypted.

Attackers instruct to pay the ransom amount by giving a website, in which victims find the step to recover the decryption key to unlock the encrypted files.

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