What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey
Seeing the Trojan:Win32/CryptExt.A!MTB malware detection usually means that your system is in big danger. This virus can correctly be identified as ransomware – virus which ciphers your files and forces you to pay for their decryption. Stopping it requires some specific steps that must be done as soon as possible.
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Trojan:Win32/CryptExt.A!MTB detection is a malware detection you can spectate in your system. It usually shows up after the preliminary activities on your computer – opening the dubious e-mail, clicking the banner in the Internet or mounting the program from untrustworthy resources. From the second it shows up, you have a short time to do something about it before it begins its harmful activity. And be sure – it is better not to wait for these malicious effects.

What is Trojan:Win32/CryptExt.A!MTB virus?

Trojan:Win32/CryptExt.A!MTB is ransomware-type malware. It searches for the files on your computer, encrypts it, and then asks you to pay the ransom for getting the decryption key. Besides making your documents locked, this virus additionally does a lot of damage to your system. It modifies the networking setups in order to avoid you from checking out the elimination guides or downloading the anti-malware program. In some cases, Trojan:Win32/CryptExt.A!MTB can additionally prevent the launching of anti-malware programs.

Trojan:Win32/CryptExt.A!MTB Summary

In total, Trojan:Win32/CryptExt.A!MTB virus actions in the infected PC 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;
  • Anomalous file deletion behavior detected (10+);
  • A process attempted to delay the analysis task.;
  • Dynamic (imported) function loading detected;
  • Performs HTTP requests potentially not found in PCAP.;
  • Enumerates running processes;
  • CAPE extracted potentially suspicious content;
  • Authenticode signature is invalid;
  • Steals private information from local Internet browsers;
  • Collects information about installed applications;
  • Checks the CPU name from registry, possibly for anti-virtualization;
  • Attempts to modify proxy settings;
  • Harvests cookies for information gathering;
  • Harvests credentials from local FTP client softwares;
  • Harvests information related to installed instant messenger clients;
  • Harvests information related to installed mail clients;
  • Collects information to fingerprint the system;
  • Encrypting the documents located on the target’s disk drives — so the victim cannot use these documents;
  • Blocking the launching of .exe files of anti-malware apps
  • Blocking the launching of installation files of anti-malware programs

Ransomware has been a nightmare for the last 4 years. It is hard to picture a more hazardous virus for both individual users and organizations. The algorithms used in Trojan:Win32/CryptExt.A!MTB (usually, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need more time than our galaxy already exists, and possibly will exist. But that malware does not do all these unpleasant things immediately – it can take up to a few hours to cipher all of your files. Thus, seeing the Trojan:Win32/CryptExt.A!MTB detection is a clear signal that you should start the clearing procedure.

Where did I get the Trojan:Win32/CryptExt.A!MTB?

Usual methods of Trojan:Win32/CryptExt.A!MTB distribution are standard for all other ransomware examples. Those are one-day landing sites where users are offered to download and install the free software, so-called bait e-mails and hacktools. Bait emails are a pretty new tactic in malware distribution – you receive the e-mail that simulates some regular notifications about shipments or bank service conditions shifts. Within the e-mail, there is a malicious MS Office file, or a web link which leads to the exploit landing page.

Malicious email spam

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

Preventing it looks fairly easy, however, still needs tons of recognition. Malware can hide in different spots, and it is far better to stop it even before it goes into your computer than to depend on an anti-malware program. Basic cybersecurity knowledge is just an important thing in the modern-day world, even if your interaction with a PC remains on YouTube videos. That may keep you a lot of money and time which you would certainly spend while trying to find a solution.

Trojan:Win32/CryptExt.A!MTB malware technical details

File Info:

name: 59FA1CE6C4842731525F.mlw
path: /opt/CAPEv2/storage/binaries/ded9465bcd3b267051a37c53ac53914fcd0cb70d97c4123ec2884dc436fae1c9
crc32: 1DAD8FF1
md5: 59fa1ce6c4842731525f1a80a7376292
sha1: 9a276c28d2cb9c2f47dda3d0feb68bae3fab0821
sha256: ded9465bcd3b267051a37c53ac53914fcd0cb70d97c4123ec2884dc436fae1c9
sha512: 3607edd4d312ed6999e4c230d3fc58b5d277ed4cad5bb90a38ace94bf570f39152531eceaaa17f40a4add262ebbc8bad970275fd53976ca40f74966c6f8a8f4f
ssdeep: 24576:eQtlojke8Q9M7Tz86lPCg+ONH+2WN3el:ajdMz86He22I
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T12225E02176E58C30E5F306734539E60146BEBD726B739ACBA7C8194EBA741D0A732723
sha3_384: c3a9b81ad0c58e85ac336be81a5357bc3fa2406f822c9fe3fc517d19a73d0b47ec7238c48d8c04a0098ecf0a98ff37c0
ep_bytes: e88e830000e9000000006a1468702044
timestamp: 2018-05-09 02:19:39

Version Info:

0: [No Data]

Trojan:Win32/CryptExt.A!MTB also known as:

Elasticmalicious (high confidence)
CrowdStrikewin/malicious_confidence_100% (D)
K7GWTrojan ( 0054f74b1 )
K7AntiVirusTrojan ( 0054f74b1 )
ESET-NOD32a variant of Win32/Kryptik.GTPU
EmsisoftTrojan.Brsecmon.1 (B)
MAXmalware (ai score=100)
CynetMalicious (score: 100)
RisingMalware.Heuristic!ET#99% (RDMK:cmRtazqOAAO3VT84cRmhTHoq3mFA)
SentinelOneStatic AI – Malicious PE

How to remove Trojan:Win32/CryptExt.A!MTB?

Trojan:Win32/CryptExt.A!MTB malware is very hard to remove manually. It places its data in a variety of locations throughout the disk, and can get back itself from one of the elements. Moreover, numerous alterations in the registry, networking setups and Group Policies are really hard to identify and change to the original. It is better to use a special tool – exactly, an anti-malware tool. GridinSoft Anti-Malware will fit the best for malware removal reasons.

Why GridinSoft Anti-Malware? It is very light-weight and has its databases updated practically every hour. Furthermore, it does not have such bugs and vulnerabilities as Microsoft Defender does. The combination of these facts makes GridinSoft Anti-Malware ideal for clearing away malware of any form.

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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