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The story so far: The Computer Emergency Response Team of India issued an alert for ransomware dubbed Akira. The ransomware, found to target both Windows and Linux devices, steals and encrypts data, forcing victims to pay double ransom for decryption and recovery. The group behind the ransomware has already targeted multiple victims, mainly those located in the U.S., and has an active Akira ransomware leak site with information, including their most recent data leaks.

The Akira ransomware is designed to encrypt data, create a ransomware note and delete Windows Shadow Volume copies on affected devices. The ransomware gets its name due to its ability to modify filenames of all encrypted files by appending them with the .akira extension. The ransomware is designed to close processes or shut down Windows services that may keep it from encrypting files on the affected system. It uses VPN services, especially when users have not enabled two-factor authentication, to trick users into downloading malicious files.

Once the ransomware infects a device and steals/encrypts sensitive data, the group behind the attack extorts the victims into paying a ransom, threatening to release the data on their dark web blog if their demands are not met.

As mentioned above, the ransomware deletes the Windows Shadow Volume copies on the affected device. These files are instrumental in ensuring that organisations can back up data used in their applications for day-to-day functioning. VSS services facilitate communication between different components without the need to take them offline, thereby ensuring data is backed up while it is also available for other functions. Once the ransomware deletes the VSS files it proceeds to encrypt files with the pre-defined the .akira extension.

The ransomware also terminates active Windows services using the Windows Restart Manager API, preventing any interference with the encryption process. It is designed to not encrypt Program Data, Recycle Bin, Boot, System Volume information, and other folders instrumental in system stability. It also avoids modifying Windows system files with extensions like .syn. .msl and .exe.

Once sensitive data is stolen and encrypted, the ransomware leaves behind a note named akira_readme.txt which includes information about the attack and the link to Akiras leak and negotiation site.

Each victim is given a unique negotiation password to be entered into the threat actors Tor site. Unlike other ransomware operations, this negotiation site just includes a chat system that the victim can use to communicate with the ransomware gang, a report from The Bleeping Computer shares.

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Ransomware is typically spread through spear phishing emails that contain malicious attachments in the form of archived content (zip/rar) files. Other methods used to infect devices include drive-by-download, a cyber-attack that unintentionally downloads malicious code onto a device, and specially crafted web links in emails, clicking on which downloads malicious code. The ransomware reportedly also spreads through insecure Remote Desktop connections.

Maintain up-to-date offline backups

Ensure OS and networks are updated regularly, with virtual patching for legacy systems

Establish Domain-based Message Authentication, Reporting, and Conformance, Domain Keys Identified Mail (DKIM), and Sender policy for organizational email validation

Strong password policies

Strong Multi-Factor Authentication

Strict external device usage policy

Data-at-rest and data-in-transit encryption

Blocking attachment file types with .exe,.pif, .url, or other such extensions

Avoid clicking on suspicious links to avoid downloads of malicious code

Conduct regular security audits of systems, especially database servers

In use since March 2023, the ransomware has steadily built up a list of victims, targetting corporate networks in various domains including education, finance, real estate, manufacturing, and consulting. Once it breaches a corporate network, the ransomware spreads laterally to other devices after gaining Windows domain admin credentials. The threat actors also steal sensitive corporate data for leverage in their extortion attempts.

CERT-In has advised users to follow basic internet hygiene and protection protocols to ensure their security against ransomware. These include maintaining up to date offline backups of critical data, to prevent data loss in the event of an attack.

Additionally, users are advised to ensure all operating systems and networks are updated regularly, with virtual patching for legacy systems and networks. Companies must also establish Domain-based Message Authentication, Reporting, and Conformance, Domain Keys Identified Mail (DKIM), and Sender policy for organizational email validation, which prevents spam by detecting email spoofing. Strong password policies and multi-factor authentication (MFA) must be enforced. There should also be a strict external device usage policy in place and data-at-rest and data-in-transit encryption along with blocking attachment file types like .exe, .pif, or .url to avoid downloading malicious code. The agency has also advised periodic security audits of critical networks/systems, especially database servers.

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What is the Akira ransomware, and why has the government issued a warning against it? - The Hindu