What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey
Seeing the Backdoor:Win32/Tofsee.BK!MTB detection usually means that your PC is in big danger. This malware can correctly be identified as ransomware – sort of malware which ciphers your files and asks you to pay for their decryption. Stopping it requires some specific steps that must be done as soon as possible.
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Backdoor:Win32/Tofsee.BK!MTB detection is a virus detection you can spectate in your system. It generally appears after the preliminary procedures on your computer – opening the dubious email, clicking the banner in the Internet or setting up the program from untrustworthy resources. From the second it appears, you have a short time to take action before it begins its harmful activity. And be sure – it is better not to await these destructive effects.

What is Backdoor:Win32/Tofsee.BK!MTB virus?

Backdoor:Win32/Tofsee.BK!MTB is ransomware-type malware. It looks for the files on your computer, encrypts it, and after that asks you to pay the ransom for receiving the decryption key. Besides making your files locked, this malware also does a ton of damage to your system. It modifies the networking settings in order to avoid you from looking for the removal guides or downloading the antivirus. In rare cases, Backdoor:Win32/Tofsee.BK!MTB can even prevent the launching of anti-malware programs.

Backdoor:Win32/Tofsee.BK!MTB Summary

In summary, Backdoor:Win32/Tofsee.BK!MTB malware actions in the infected computer are next:

  • SetUnhandledExceptionFilter detected (possible anti-debug);
  • Behavioural detection: Executable code extraction – unpacking;
  • Executed a command line with /C or /R argument to terminate command shell on completion which can be used to hide execution;
  • 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;
  • Checks adapter addresses which can be used to detect virtual network interfaces;
  • Dynamic (imported) function loading detected;
  • Performs HTTP requests potentially not found in PCAP.;
  • A named pipe was used for inter-process communication;
  • Reads data out of its own binary image;
  • A process created a hidden window;
  • CAPE extracted potentially suspicious content;
  • Drops a binary and executes it;
  • Unconventionial language used in binary resources: Korean;
  • Authenticode signature is invalid;
  • Uses Windows utilities for basic functionality;
  • Enumerates services, possibly for anti-virtualization;
  • Behavioural detection: Injection (Process Hollowing);
  • Executed a process and injected code into it, probably while unpacking;
  • Deletes its original binary from disk;
  • Behavioural detection: Injection (inter-process);
  • Behavioural detection: Injection with CreateRemoteThread in a remote process;
  • Collects and encrypts information about the computer likely to send to C2 server;
  • Installs itself for autorun at Windows startup;
  • Installs itself for autorun at Windows startup;
  • Creates a hidden or system file;
  • CAPE detected the Tofsee malware family;
  • Deletes executed files from disk;
  • Attempts to interact with an Alternate Data Stream (ADS);
  • Anomalous binary characteristics;
  • Uses suspicious command line tools or Windows utilities;
  • Encrypting the files kept on the target’s disk — so the victim cannot open these files;
  • Blocking the launching of .exe files of anti-virus apps
  • Blocking the launching of installation files of security tools

Ransomware has actually been a horror story for the last 4 years. It is hard to picture a more damaging malware for both individuals and corporations. The algorithms used in Backdoor:Win32/Tofsee.BK!MTB (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 terrible things without delay – it may take up to a few hours to cipher all of your files. Therefore, seeing the Backdoor:Win32/Tofsee.BK!MTB detection is a clear signal that you have to start the elimination process.

Where did I get the Backdoor:Win32/Tofsee.BK!MTB?

Usual methods of Backdoor:Win32/Tofsee.BK!MTB distribution are basic for all other ransomware variants. Those are one-day landing web pages where victims are offered to download and install the free software, so-called bait emails and hacktools. Bait e-mails are a pretty new tactic in malware spreading – you get the e-mail that mimics some standard notifications about shippings or bank service conditions modifications. Inside of the e-mail, there is a malicious 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 uncomplicated, but still needs a lot of focus. Malware can hide in different places, and it is much better to prevent it even before it goes into your computer than to trust in an anti-malware program. Common cybersecurity knowledge is just an important thing in the modern world, even if your relationship with a PC stays on YouTube videos. That may save you a great deal of money and time which you would spend while seeking a fix guide.

Backdoor:Win32/Tofsee.BK!MTB malware technical details

File Info:

name: 2DE6D19FAC6948E42DDF.mlw
path: /opt/CAPEv2/storage/binaries/dbb342a2c5c4fb63004faf6b5c79c7c850d80189f913220818a314166dc4dfcc
crc32: DC839F20
md5: 2de6d19fac6948e42ddfe32e73bb826f
sha1: 9ae6d621f63044d327e52a6133ed65ce2599f2f0
sha256: dbb342a2c5c4fb63004faf6b5c79c7c850d80189f913220818a314166dc4dfcc
sha512: e246c266c1fed3df20932e0336862268899bc2c2f5987024a422c417c79898a5ef1680a12374060e969eb13f13510be7eb807c71992b3a5cd6fa384c284ec27f
ssdeep: 6144:3lqiMbO7p6sJk/nFUiia008/CaNV7kgJhps2FRbq4LT:1+O7L+/nFUVf08/CaXkgJhp1LL
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T11BC6D5017B95954AE4223E364935CAA65B26FFFBFD1003CB31843F1EEC7A6605A81E53
sha3_384: ead037ee1d57806222a33711a9b38202599cfd73e115a849319de3e16f6a13d601a57f1ec91a7dd8dfe7533ca7b5de18
ep_bytes: 8bff558bece876b30000e8110000005d
timestamp: 2021-03-26 00:14:35

Version Info:

Translations: 0x0152 0x036f

Backdoor:Win32/Tofsee.BK!MTB also known as:

Elasticmalicious (high confidence)
K7AntiVirusRiskware ( 00584baa1 )
K7GWRiskware ( 00584baa1 )
ESET-NOD32a variant of Win32/Kryptik.HQEP
AvastWin32:BotX-gen [Trj]
SophosML/PE-A + Troj/Krypt-FV
EmsisoftTrojan.GenericKDZ.90000 (B)
SentinelOneStatic AI – Malicious PE
CynetMalicious (score: 100)
MAXmalware (ai score=86)
RisingTrojan.Generic@AI.100 (RDML:76CW6LIYAr4cag73kWK6ew)
AVGWin32:BotX-gen [Trj]
CrowdStrikewin/malicious_confidence_100% (W)

How to remove Backdoor:Win32/Tofsee.BK!MTB?

Backdoor:Win32/Tofsee.BK!MTB malware is extremely hard to eliminate manually. It stores its data in a variety of places throughout the disk, and can restore itself from one of the elements. Furthermore, numerous alterations in the registry, networking settings and also Group Policies are fairly hard to identify and return to the initial. It is far better to make use of a special program – exactly, an anti-malware tool. GridinSoft Anti-Malware will definitely fit the best for malware removal reasons.

Why GridinSoft Anti-Malware? It is pretty lightweight and has its detection databases updated nearly 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 ideal for clearing away malware of any type.

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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