What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey
Seeing the Troj/Krypt-FV detection name means that your PC is in big danger. This virus can correctly be identified as ransomware – type of malware which encrypts your files and asks you to pay for their decryption. Deleteing it requires some unusual steps that must be taken as soon as possible.
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Troj/Krypt-FV detection is a malware detection you can spectate in your system. It generally appears after the preliminary procedures on your computer – opening the untrustworthy e-mail messages, clicking the banner in the Web or mounting the program from unreliable sources. From the instance it shows up, you have a short time to do something about it until it starts its destructive activity. And be sure – it is better not to wait for these harmful actions.

What is Troj/Krypt-FV virus?

Troj/Krypt-FV is ransomware-type malware. It searches for the files on your disks, encrypts it, and after that asks you to pay the ransom for receiving the decryption key. Besides making your documents locked, this malware also does a lot of harm to your system. It modifies the networking setups in order to avoid you from checking out the elimination tutorials or downloading the anti-malware program. In rare cases, Troj/Krypt-FV can even prevent the setup of anti-malware programs.

Troj/Krypt-FV Summary

In summary, Troj/Krypt-FV ransomware activities in the infected computer are next:

  • SetUnhandledExceptionFilter detected (possible anti-debug);
  • Behavioural detection: Executable code extraction – unpacking;
  • Yara rule detections observed from a process memory dump/dropped files/CAPE;
  • Creates RWX memory;
  • Possible date expiration check, exits too soon after checking local time;
  • Dynamic (imported) function loading detected;
  • A process created a hidden window;
  • CAPE extracted potentially suspicious content;
  • Unconventionial language used in binary resources: Uzbek (Latin);
  • The binary contains an unknown PE section name indicative of packing;
  • The binary likely contains encrypted or compressed data.;
  • Authenticode signature is invalid;
  • Behavioural detection: Injection (Process Hollowing);
  • Executed a process and injected code into it, probably while unpacking;
  • Detects Sandboxie through the presence of a library;
  • Detects Avast Antivirus through the presence of a library;
  • Behavioural detection: Injection (inter-process);
  • Created a process from a suspicious location;
  • Checks the presence of disk drives in the registry, possibly for anti-virtualization;
  • Ciphering the documents located on the victim’s disks — so the victim cannot use these files;
  • Blocking the launching of .exe files of anti-virus programs
  • Blocking the launching of installation files of anti-malware apps

Ransomware has actually been a horror story for the last 4 years. It is challenging to picture a more dangerous virus for both individuals and companies. The algorithms utilized in Troj/Krypt-FV (generally, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need to have a lot more time than our galaxy actually exists, and possibly will exist. But that virus does not do all these unpleasant things without delay – it can take up to several hours to cipher all of your files. Thus, seeing the Troj/Krypt-FV detection is a clear signal that you have to begin the clearing procedure.

Where did I get the Troj/Krypt-FV?

Common ways of Troj/Krypt-FV injection are common for all other ransomware examples. Those are one-day landing sites where users are offered to download and install the free program, so-called bait e-mails and hacktools. Bait emails are a relatively modern method in malware spreading – you receive the e-mail that imitates some normal notifications about deliveries or bank service conditions updates. Within the e-mail, there is an infected MS Office file, or a link which opens the exploit landing site.

Malicious email spam

Malicious email message. This one tricks you to open the phishing website.

Preventing it looks fairly simple, however, still requires a lot of attention. Malware can hide in different places, and it is much better to stop it even before it goes into your system than to rely upon an anti-malware program. General cybersecurity knowledge is just an important thing in the modern world, even if your interaction with a computer stays on YouTube videos. That can keep you a lot of time and money which you would spend while trying to find a fix guide.

Troj/Krypt-FV malware technical details

File Info:

name: 39ADF3F9F240AEA136C3.mlw
path: /opt/CAPEv2/storage/binaries/9b6dea6b5a7747d21327e04430b02a63d4e3cd6cf3fcfebc876c94fb6e6c2a64
crc32: 259D1399
md5: 39adf3f9f240aea136c3b5e631c316d8
sha1: 7952568bb436970a90e2d0a1d1a10ce3cad01799
sha256: 9b6dea6b5a7747d21327e04430b02a63d4e3cd6cf3fcfebc876c94fb6e6c2a64
sha512: 468e9b083884535c183200e4c79532b445aaacee281591fa8616925b7ca3cdd71c509787370dd65b33db53b7ee211c42f3981c493b84132bc50d2e61fea219f5
ssdeep: 6144:40NE4eQGcN/2PiTNb1mOzdveIaU0Z3mzGVt/EB20uCtnjA:jNpfxJ1pzZeIaUQU4t/JZ
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1D8447D14BB90D034F5B712F4497993A9BA3ABEF19B2490CB62D52AED57346E0EC30317
sha3_384: 5792297c455bd2bb2db9c3de0730cbc0a12b3ee95ae8d0b78c1560e714283e4ebe7b832bcc132ec02c3b2c58c0375751
ep_bytes: 8bff558bece826d10000e8110000005d
timestamp: 2021-11-08 12:28:33

Version Info:

0: [No Data]

Troj/Krypt-FV also known as:

Elasticmalicious (high confidence)
CrowdStrikewin/malicious_confidence_100% (W)
AvastFileRepMalware [Drp]
SentinelOneStatic AI – Malicious PE
CynetMalicious (score: 100)
RisingTrojan.Generic@AI.100 (RDML:FsBNu4pRAjNJJeicBEyodA)
AVGFileRepMalware [Drp]

How to remove Troj/Krypt-FV?

Troj/Krypt-FV malware is extremely difficult to delete by hand. It places its documents in multiple places throughout the disk, and can get back itself from one of the elements. Moreover, numerous alterations in the registry, networking configurations and Group Policies are really hard to find and change to the original. It is far better to use a specific app – exactly, an anti-malware program. GridinSoft Anti-Malware will fit the most ideal for malware elimination purposes.

Why GridinSoft Anti-Malware? It is very lightweight and has its databases updated almost every hour. In addition, it does not have such bugs and exploits as Microsoft Defender does. The combination of these details makes GridinSoft Anti-Malware perfect for clearing away malware of any kind.

Remove the viruses with GridinSoft Anti-Malware

  • Download and install GridinSoft Anti-Malware. After the installation, you will be offered to perform the Standard Scan. Approve this action.
  • Gridinsoft Anti-Malware during the scan process

  • Standard scan checks the logical disk where the system files are stored, together with the files of programs you have already installed. The scan lasts up to 6 minutes.
  • GridinSoft Anti-Malware scan results

  • When the scan is over, you may choose the action for each detected virus. For all files of [SHORT_NAME] the default option is “Delete”. Press “Apply” to finish the malware removal.
  • GridinSoft Anti-Malware - After Cleaning
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About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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