Mmdt Virus Ransomware (.mmdt File) Removal

What is Mmdt ransomware?

Mmdt ransomware is a formidable adversary, encrypting your files and demanding a ransom, while also compromising several critical system functions. You may find yourself struggling to access certain websites or perform basic tasks. Yet, understanding your opponent is half the battle won.

Employing the Salsa20 encryption algorithm, this ransomware presents a near-impossible challenge to overcome. With an extensive key length and an astronomical number of potential keys, brute-force attacks are impractical without extraordinarily powerful computing resources. While utilizing already compromised decryption keys is one approach, the success rate of such decryption tools is generally low.

The intrusion of ransomware into your PC is no mysterious affair. Mmdt ransomware predominantly spreads through dubious means, including "free" versions of well-known software, cheat engines, Windows activators, and keygens. These methods are common across all STOP/Djvu ransomware family members, with Mmdt being no exception. Investing in legitimate software licenses is not only simpler but also significantly cheaper than the hefty sum demanded for file decryption.

Encryption process

The Mmdt ransomware uses the Salsa20 encryption algorithm. That is not the strongest method, but it still provides an overwhelming amount of possible decryption keys. To brute force the 78-digit number of keys, you need 3.5 unvigintillion years (1*10^65), even if you use the most powerful regular PC. Quantum computers can show a bit better results, but it is still too slow to get your files back while you are alive.

The exact algorithm of encryption is next: malware scans each folder for the files it is able to encrypt. Then, when it finds the target, it makes a copy of your file, removes the original one, encrypts the copy and leaves it instead of the removed original. Such a procedure is done to prevent the situation when you have already opened the file, so ransomware is not able to read it because of the Windows restrictions. To each encrypted copy, the virus adds the specific extension - ".mmdt". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

Such an encryption method can be exploited for file recovery. Since the original file is deleted, you may try to recover it using the file recovery tools. The less time is passed - the bigger the chance to get your files back, so hurry up!

Another specific moment that can help you to use the files even after the encryption is the fact that Mmdt ransomware encrypts only the first 150KB of each file. Hence, you can try to run a big file, such as video or music, without the encryption. Similar feature also works with other ransomware families - Dharma, Conti and Makop encrypt the same 150KB.

Ransom note: _readme.txt

Ransom note is the same for the whole ransomware family. In fact, it is one of the main signs of to which family the certain ransomware belongs. Here is the typical note for STOP/Djvu family:

External Links:

🔗 HowToFix.Guide: How To Decrypt .mmdt Files?

Indicators of Compromise(IOC)

File Name	MD5	File Size
📜 SAMPLE.EXE	1972569605776d6dd2c61fe9e0728f15	271360
📜 SAMPLE.EXE	c3f54b4731d2f4c2df6140561efe02af	272384
📜 SAMPLE.EXE	057da021f7c35ecf1487246372a07791	270848
📜 SAMPLE.EXE	fd1d5e1cc4d77d944d970eeaa0b7dc74	1273856
📜 SAMPLE.EXE	abd6cd3cfb180beacd03e0a97a2d7547	281600
📜 SAMPLE.EXE	31e7391507f0770622741989b7b3a00a	215040
📜 SAMPLE.EXE	3b1642dd6d275aff1067b8362e9db661	211968
📜 SAMPLE.EXE	1bd807247f3e2f2c80227401a5657b0b	209920
📜 SAMPLE.EXE	c054a5b2737af0278f1f36fd70fd1c6d	296448
📜 SAMPLE.EXE	e2a8b2851b1b7ec84eade5c32073a481	249856