![]() ![]() Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files. A ransom demand message is displayed on your desktop. Threat Summary: NameĪvast (CrypterX-gen ), Kaspersky (UDS:), Malwarebytes (Trojan.MalPack), Microsoft (Trojan:Win32/Sabsik.FL.B!ml), Symantec (ML.Attribute.HighConfidence), Full List Of Detections ( VirusTotal)Ĭannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). ![]() ![]() The most widely used distribution methods include: drive-by (stealthy and deceptive) downloads, malicious attachments and links in spam emails/messages, online scams, illegal software activation tools ("cracks"), dubious download channels (e.g., P2P sharing networks, freeware and third-party sites, etc.), and fake updates. Once a such file is executed, run, or otherwise opened - malware download/installation processes are triggered. run, etc.), archives (RAR, ZIP, etc.), Microsoft Office and PDF documents, JavaScript, and so on. Malicious software is usually presented as or bundled with ordinary programs/media. Malware (ransomware included) is proliferated using phishing and social engineering techniques. While this malware operates nearly identically throughout, these programs do have two major differences in-between - the cryptographic algorithms they use ( symmetric or asymmetric) and the ransom size. Mmvb, Key Group, Mmpu, and CRYPTCAT are merely a few examples of ransomware that we have analyzed recently. Therefore, we strongly recommend keeping backups in multiple separate locations (e.g., remote servers, unplugged storage devices, etc.) - to avoid permanent data loss. The only solution is recovering them from a backup (if one is available). Unfortunately, removal will not restore already compromised files. To prevent Mmdt ransomware from encrypting more data, it must be removed from the operating system. Hence, it is expressly advised against paying and thus supporting this criminal activity. What is more, victims often do not receive the decryption keys/software - despite meeting the ransom demands. ![]() We have analyzed and researched thousands of ransomware infections, and this experience allows us to infer that decryption is rarely possible without the cyber criminals' interference. Before paying, the victim can test the decryption by sending the criminals a single encrypted file. The price of the recovery tools is $980 however, if the victim contacts the attackers within 72 hours - the price will be halved ($490). The sole method of restoring them is by purchasing the decryption key and program from the cyber criminals behind the ransomware attack. Mmdt's ransom note states that the victim's files have been encrypted. Screenshot of files encrypted by Mmdt ransomware: Afterwards, a ransom-demanding message titled " _readme.txt" was created. For example, a file named " 1.jpg" appeared as " 1.jpg.mmdt", " 2.png" as " 2.png.mmdt", etc. When we launched a sample of this ransomware on our test system, it began encrypting files and appended their filenames with a ". Mmdt is classified as ransomware, and it is part of the Djvu malware family. Our research team discovered the Mmdt malicious program during a routine inspection of new submissions to VirusTotal. ![]()
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