Ransom:Win32/StopCrypt.CK!MTB

What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey
Seeing the Ransom:Win32/StopCrypt.CK!MTB malware detection means that your PC is in big danger. This computer virus can correctly be identified as ransomware – sort of malware which encrypts your files and forces you to pay for their decryption. Removing it requires some peculiar steps that must be taken as soon as possible.
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Ransom:Win32/StopCrypt.CK!MTB detection is a malware detection you can spectate in your system. It often appears after the preliminary procedures on your computer – opening the untrustworthy e-mail messages, clicking the banner in the Internet or setting up the program from untrustworthy resources. From the moment it shows up, you have a short time to do something about it before it starts its destructive action. And be sure – it is much better not to wait for these malicious effects.

What is Ransom:Win32/StopCrypt.CK!MTB virus?

Ransom:Win32/StopCrypt.CK!MTB is ransomware-type malware. It looks for the documents on your disk drive, ciphers it, and then asks you to pay the ransom for getting the decryption key. Besides making your documents inaccessible, this malware also does a lot of harm to your system. It modifies the networking settings in order to avoid you from checking out the removal guides or downloading the antivirus. In some cases, Ransom:Win32/StopCrypt.CK!MTB can additionally prevent the setup of anti-malware programs.

Ransom:Win32/StopCrypt.CK!MTB Summary

In summary, Ransom:Win32/StopCrypt.CK!MTB malware 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;
  • Dynamic (imported) function loading detected;
  • Reads data out of its own binary image;
  • CAPE extracted potentially suspicious content;
  • Drops a binary and executes it;
  • Unconventionial language used in binary resources: Spanish (Colombia);
  • The binary contains an unknown PE section name indicative of packing;
  • The binary likely contains encrypted or compressed data.;
  • Authenticode signature is invalid;
  • Created a process from a suspicious location;
  • Installs itself for autorun at Windows startup;
  • Creates a copy of itself;
  • Ciphering the files kept on the target’s drive — so the victim cannot use these documents;
  • Blocking the launching of .exe files of security tools
  • Blocking the launching of installation files of anti-virus programs

Ransomware has been a horror story for the last 4 years. It is hard to realize a more harmful virus for both individuals and organizations. The algorithms used in Ransom:Win32/StopCrypt.CK!MTB (generally, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need to have more time than our galaxy actually exists, and possibly will exist. However, that virus does not do all these bad things immediately – it can require up to several hours to cipher all of your documents. Thus, seeing the Ransom:Win32/StopCrypt.CK!MTB detection is a clear signal that you have to begin the elimination procedure.

Where did I get the Ransom:Win32/StopCrypt.CK!MTB?

Usual ways of Ransom:Win32/StopCrypt.CK!MTB distribution are usual for all other ransomware examples. Those are one-day landing websites where victims are offered to download the free software, so-called bait emails and hacktools. Bait emails are a quite new tactic in malware distribution – you get the email that mimics some standard notifications about shippings or bank service conditions shifts. Within the e-mail, there is an infected MS Office file, or a web link which opens the exploit landing site.

Malicious email spam

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

Avoiding it looks quite uncomplicated, however, still demands tons of focus. Malware can hide in various places, and it is better to prevent it even before it goes into your system than to rely on an anti-malware program. Common cybersecurity awareness is just an essential item in the modern-day world, even if your interaction with a computer stays on YouTube videos. That may save you a lot of money and time which you would spend while searching for a solution.

Ransom:Win32/StopCrypt.CK!MTB malware technical details

File Info:

name: 8B2E338CCB5D9EBAC4D2.mlw
path: /opt/CAPEv2/storage/binaries/eeddd28d3c12f716386aeb99d02b678dda2a746cf5b3acf75a9442c4de8dc9db
crc32: 1626DFC0
md5: 8b2e338ccb5d9ebac4d25077f0ff05e4
sha1: a63808eac28309600b6dc6bffd1e04da2db389ca
sha256: eeddd28d3c12f716386aeb99d02b678dda2a746cf5b3acf75a9442c4de8dc9db
sha512: 7b32a2a40552f119f6a4d1303bccb7f132c09069f214e1d1440f87d7372ec05933cdf5750eadf630f1917e68fcbe633466522ac41edf6fce631c67749c899d8d
ssdeep: 12288:Rx/4FK+hMT57Oj1yoMJUb9ft76OdeOktEZgXUi+0PFS:RBeVm5U1iJUbpV6OwfEZaUM
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T10CB4BF10BBA0D035F1B752F44A7A93A8A52E7EF15B2850CB53D52AED67346E0ED3130B
sha3_384: bbe57b59a813c9e02a5512e44545e016a214afb9cf9faeb3905b17f85906c0616bb61d2acfd73b81ed4b1050f2f13931
ep_bytes: 8bff558bece8c6f70000e8110000005d
timestamp: 2020-12-09 11:57:11

Version Info:

0: [No Data]

Ransom:Win32/StopCrypt.CK!MTB also known as:

Bkav W32.AIDetect.malware1
Lionic Trojan.Win32.Convagent.3!c
Elastic malicious (high confidence)
Cynet Malicious (score: 100)
CAT-QuickHeal Trojan.Zenpak
ALYac Trojan.GenericKD.38440012
Malwarebytes Trojan.MalPack.GS
Sangfor Trojan.Win32.Save.a
K7AntiVirus Trojan ( 0058c89a1 )
BitDefender Trojan.GenericKD.38440012
K7GW Trojan ( 0058c89a1 )
Cybereason malicious.ac2830
Cyren W32/Kryptik.FZV.gen!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Kryptik.HNWJ
APEX Malicious
Paloalto generic.ml
Kaspersky HEUR:Trojan.Win32.Zenpak.gen
Alibaba Ransom:Win32/StopCrypt.8d528a12
MicroWorld-eScan Trojan.GenericKD.38440012
Avast Win32:CrypterX-gen [Trj]
Rising Malware.Obscure!1.A3BB (CLOUD)
Ad-Aware Trojan.GenericKD.38440012
Sophos Mal/Generic-S + Troj/Krypt-FV
TrendMicro Ransom_StopCrypt.R06CC0DA722
McAfee-GW-Edition BehavesLike.Win32.PUPXKR.gc
FireEye Generic.mg.8b2e338ccb5d9eba
Emsisoft Trojan.Crypt (A)
Ikarus Trojan.Win32.Crypt
GData Win32.Trojan.BSE.ZUWFTJ
Antiy-AVL Trojan/Generic.ASMalwS.34FBB79
Kingsoft Win32.Troj.Generic_a.a.(kcloud)
Arcabit Trojan.Generic.D24A8C4C
Microsoft Ransom:Win32/StopCrypt.CK!MTB
AhnLab-V3 Infostealer/Win.RedLine.R462370
Acronis suspicious
McAfee Packed-GEE!8B2E338CCB5D
MAX malware (ai score=88)
VBA32 Exploit.Convagent
Cylance Unsafe
TrendMicro-HouseCall Ransom_StopCrypt.R06CC0DA722
Tencent Backdoor.Win32.Tofsee.16000134
Yandex Trojan.Kryptik!xh2fk+yIr/M
SentinelOne Static AI – Malicious PE
MaxSecure Trojan.Malware.300983.susgen
Fortinet W32/Kryptik.HNWJ!tr
AVG Win32:CrypterX-gen [Trj]
Panda Trj/GdSda.A
CrowdStrike win/malicious_confidence_90% (W)

How to remove Ransom:Win32/StopCrypt.CK!MTB?

Ransom:Win32/StopCrypt.CK!MTB malware is incredibly difficult to eliminate by hand. It puts its data in multiple locations throughout the disk, and can recover itself from one of the elements. In addition, a lot of alterations in the windows registry, networking configurations and also Group Policies are fairly hard to locate and revert to the original. It is better to utilize a special app – exactly, an anti-malware app. GridinSoft Anti-Malware will fit the best for virus elimination reasons.

Why GridinSoft Anti-Malware? It is very light-weight and has its databases updated practically every hour. Furthermore, it does not have such problems and vulnerabilities as Microsoft Defender does. The combination of these details makes GridinSoft Anti-Malware ideal for taking out 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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