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Nesa Ransomware

Posted: September 24, 2019

The Nesa Ransomware is a file-locker Trojan that stops documents, images, and other media from opening on your computer. Its encryption-based attacks include an extortionist component that solicits payment for the criminal's data-unlocking assistance. Let your anti-malware services provide protection by deleting the Nesa Ransomware automatically and store backups securely for the best recovery options after an attack.

New Patches for Trojans Makes for New Blocked Media Problems

Malware experts can confirm that the STOP Ransomware remains active with new variants as September nears a close. The Nesa Ransomware is a recent build number, at 166, which makes it more modernized than relatives like the Truke Ransomware, the Vesad Ransomware, the Boston Ransomware, or much older builds like the Djvu Ransomware. However, this family's attacks are predictable and always involve thwarting the victim's file access for making money.

The Windows-based the Nesa Ransomware always uses a primary file-locking technique of AES and RSA, which is traditionally-preferred by many Ransomware-as-a-Service families for its efficiency and security. If it can connect to its server during the process, it will use a dynamic RSA algorithm, which has much higher chances of making free decryption impossible for most victims. Otherwise, it uses a hard-coded one embedded in its code. It also helps users with identifying the blocked content by flagging them with 'nesa' extensions.

Malware experts haven't analyzed the Nesa Ransomware's ransom note, but it's unlikely that the Trojan is updating the format from the previous Notepad TXT. This message provides contact details, such as a Bitmessage address, and solicits money in return for the decryptor that could recover your work. The ransom transactions take place through means like cryptocurrencies, which keeps users from getting refunds.

Extracting Yourself from Ransoming Situations in Advance

An ounce of preparation is worth, not just a pound, but thousands of dollars in counteracting Ransomware-as-a-Service campaigns. The Nesa Ransomware's family prefers Southeast Asian nations for their attacks, although malware experts can verify infections in other locations, including ones as far off as Europe. Their infection strategies tend to consist of one or all of the below:

  • Vulnerable servers can become compromised through brute-forcing their credentials or by exploits targeting software vulnerabilities. Once the criminal has admin access, he drops and runs the Trojan.
  • Some versions of the STOP Ransomware pretend that they're downloads for premium products or their illicit cracks. Torrent networks are frequent distributors for this technique.
  • Browser-based attacks involving the Nesa Ransomware can use compromised advertising (or malvertising), as well as Exploit Kits that, once again, abuse vulnerabilities in their drive-by-downloads.

Best practices for Web-browsing and server administration can prevent the majority of such attacks. Users also can protect any files of importance by backing them up onto another device for a dependable restoration possibility. Finally, anti-malware tools always can remove the Nesa Ransomware as a last resort, before it attacks.

While the Nesa Ransomware has few surprises for readers tracking the STOP Ransomware developments, RaaS is an industry that sees no need for change – for now. As long as there are victims worth plundering digitally, threats like this one will turn encryption into a Bitcoin-making business.

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