Vehu Virus Ransomware (.vehu File) Removal

What is Vehu ransomware?

The Vehu virus, a type of ransomware within the STOP/Djvu family, specifically targets your finances. This malware encrypts your files using a sophisticated cipher and then demands a ransom (approximately $1000) for decryption. To thwart any alternative decryption methods, the Vehu virus implements various system modifications.

These alterations primarily affect security settings. Initially, the malware disables Microsoft Defender and blocks any third-party security software present. Subsequently, it modifies Group Policies to prevent the execution of antivirus program installation files. The ultimate maneuver involves restricting access to websites offering insights on file decryption and malware eradication. Such changes can impede future PC operations, underscoring the importance of their prompt reversal.

Regarding the distribution of Vehu ransomware, its emergence isn't coincidental; it's often bundled with seemingly innocuous software. "Free" versions of inherently paid applications, crafted by anonymous developers, serve as a common vector. During the modification process, these creators can embed any malicious payload into the program's executable, ranging from spyware and coin miners to ransomware or data stealers. Sidestepping such hazards is advisable, particularly given the legal challenges in holding the culprits accountable.

Encryption process

The Vehu 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 - ".vehu". 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 Vehu 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 .vehu Files?

Indicators of Compromise(IOC)

File Name	MD5	File Size
📜 SAMPLE.EXE	b17b3bb8feb38b310f700871ca5050d1	749056
📜 SAMPLE.EXE	abba24cfeef402d2b9db9cea29dcf221	749056
📜 SAMPLE.EXE	424e20693f349eee19078202082b258f	757248
📜 SAMPLE.EXE	9fd9ed9e08cb2a5710238640aa77d475	756224
📜 SAMPLE.EXE	a7ae78432ab7bf5ac0e8e1dfa446dfbe	757248
📜 SAMPLE.EXE	2d3765dd8a6ae8ec929eaaa2465ffd6e	758272
📜 SAMPLE.EXE	6e70f533003f7b183353de9b8c1081d6	757248
📜 SAMPLE.EXE	d977f36960c0f74c4e2e5c5d7405d9a1	756224
📜 SAMPLE.EXE	69dff821a4cf51681024d07d3b52979a	755712
📜 SAMPLE.EXE	1c98e3a8789824e5025ac62e385b5271	756224