Categories: Ransom

About “Ransom:Win32/StopCrypt.SZ!MTB” infection

The Ransom:Win32/StopCrypt.SZ!MTB is considered dangerous by lots of security experts. When this infection is active, you may notice unwanted processes in Task Manager list. In this case, it is adviced to scan your computer with GridinSoft Anti-Malware.

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What Ransom:Win32/StopCrypt.SZ!MTB virus can do?

  • 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
  • Reads data out of its own binary image
  • CAPE extracted potentially suspicious content
  • Unconventionial language used in binary resources: Tswana
  • Authenticode signature is invalid
  • Uses Windows utilities for basic functionality
  • CAPE detected the Tofsee malware family
  • Deletes executed files from disk
  • Anomalous binary characteristics
  • Uses suspicious command line tools or Windows utilities

How to determine Ransom:Win32/StopCrypt.SZ!MTB?


File Info:

name: 66411B5ECBDDD6A7A782.mlwpath: /opt/CAPEv2/storage/binaries/f742e44ede6f2d13f7d2a3908195c0c61084d7ed359a67de1dea18b90a5f60e8crc32: E5C923C3md5: 66411b5ecbddd6a7a782498d752cb366sha1: 5f5425fbf7c0c7b5ab53f06e55fb89f0c9c307e4sha256: f742e44ede6f2d13f7d2a3908195c0c61084d7ed359a67de1dea18b90a5f60e8sha512: 09bde09a3736f078a0d62275756cb34608b64e34bf667d0fc22bfe820dc4e8edd2f1c7acdd04c2444cc277d1747e2643b24789ca6bc2a0b6e3c44fc851620331ssdeep: 3072:kylhBhD16Lz+BPyz58CGNmpyt8SFPeoA48L8XKP70YNfehLM/h3:xhBV0L6BIbpM1eoA48WKP4YFitype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T105E63A720C6100FFC8DACEBD9B3ABB78C4ACD6F0911A1873995143D165135AB7BC1A6Bsha3_384: 482a651380eaa3167dc20e80eb822bc7a4d2e0f3d9b18c87af2f059a04525266375d4fc2d79e3c3863195ff80255bb17ep_bytes: e8a0520000e979feffffcccccccccccctimestamp: 2021-12-02 18:27:40

Version Info:

FileVersions: 68.78.22.84InternationalName: povgwaoci.iweCopyright: Copyright (C) 2022, somoklosProjectVersion: 78.66.15.65

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

Bkav W32.AIDetect.malware2
Elastic malicious (high confidence)
DrWeb Trojan.DownLoad4.15280
MicroWorld-eScan Trojan.GenericKDZ.93135
FireEye Generic.mg.66411b5ecbddd6a7
ALYac Trojan.GenericKDZ.93135
Cylance Unsafe
K7AntiVirus Trojan ( 0059a1561 )
Cybereason malicious.bf7c0c
Cyren W32/Kryptik.HUW.gen!Eldorado
Symantec ML.Attribute.HighConfidence
tehtris Generic.Malware
ESET-NOD32 a variant of Win32/Kryptik.HRIY
APEX Malicious
ClamAV Win.Dropper.Tofsee-9976196-0
Kaspersky HEUR:Backdoor.Win32.Tofsee.gen
BitDefender Trojan.GenericKDZ.93135
Avast Win32:BotX-gen [Trj]
Ad-Aware Trojan.GenericKDZ.93135
Sophos ML/PE-A + Troj/Krypt-RQ
McAfee-GW-Edition Lockbit-FSWW!66411B5ECBDD
Trapmine malicious.moderate.ml.score
Emsisoft Trojan.GenericKDZ.93135 (B)
Ikarus Trojan-Ransom.StopCrypt
GData Trojan.GenericKDZ.93135
Google Detected
Avira TR/Crypt.XPACK.Gen
MAX malware (ai score=84)
Antiy-AVL Trojan/Generic.ASMalwS.769
Arcabit Trojan.Generic.D16BCF
ZoneAlarm HEUR:Backdoor.Win32.Tofsee.gen
Microsoft Ransom:Win32/StopCrypt.SZ!MTB
Cynet Malicious (score: 100)
AhnLab-V3 Trojan/Win.RedLine.R532255
Acronis suspicious
Malwarebytes Trojan.MalPack.GS
Rising Trojan.Generic@AI.100 (RDML:s1O1mLI0TRZzInFDHUD7Jw)
SentinelOne Static AI – Malicious PE
Fortinet W32/GenericKDZ.B365!tr
AVG Win32:BotX-gen [Trj]

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

  • Download and install GridinSoft Anti-Malware.
  • Open GridinSoft Anti-Malware and perform a “Standard scan“.
  • Move to quarantine” all items.
  • Open “Tools” tab – Press “Reset Browser Settings“.
  • Select proper browser and options – Click “Reset”.
  • Restart your computer.
Paul Valéry

I'm a cyber security analyst and data science expert with 5+ years of experience with security software contractors.

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