Stop.TYWD Ransomware

The detection of Stop.TYWD Ransomware on your system indicates a serious security threat that requires immediate attention. Ransomware is a type of malware designed to encrypt and hold hostage the data on a victim's computer, demanding payment in exchange for the decryption key. In this report, we will provide an overview of the Stop.TYWD Ransomware threat, its operating mechanisms, symptoms of infection, and most importantly, guidance on how to remove it from your system.

What Is Stop.TYWD Ransomware?

Ransomware, like Stop.TYWD Ransomware, is a malicious software that uses encryption to deny access to a victim's data. The primary goal of ransomware is to extort money from the victim by demanding payment in exchange for the decryption key needed to restore access to the encrypted data. Ransomware can spread through various means, including phishing emails, infected software downloads, and vulnerabilities in operating systems and applications.

How Stop.TYWD Ransomware Operates

Once Stop.TYWD Ransomware infects a system, it typically begins scanning for files to encrypt. The encryption process can target various types of files, including documents, images, videos, and more. After encrypting the files, the ransomware displays a ransom note, which includes instructions on how to pay the ransom in exchange for the decryption key. The ransom note may also threaten to delete the encrypted files or increase the ransom demand if the payment is not made within a specified timeframe.

Symptoms of Infection

Symptoms of a Stop.TYWD Ransomware infection can vary but often include the inability to access files, the presence of ransom notes or demands for payment, and significant changes to file extensions. In some cases, the system may become slow or unresponsive due to the encryption process. It's crucial to act quickly upon noticing these symptoms to minimize the damage and prevent further encryption of files.

How to Remove Stop.TYWD Ransomware

1. Boot your computer in Safe Mode with Networking. This will help prevent the malware from loading and give you a cleaner environment to work in.
2. Download and install a reputable anti-malware tool, such as SpyHunter. Perform a full scan of your system to detect and remove the Stop.TYWD Ransomware and any other malware that may be present.
3. Uninstall any suspicious programs or applications that you do not recognize or that were installed around the time of the infection.
4. Reset your web browsers, including Chrome, Firefox, and Edge, to their default settings. This can help remove any malicious extensions or settings that the ransomware may have altered.
5. Reboot your computer and perform another scan with your anti-malware tool to ensure that all traces of the malware have been removed.

Conclusion

The removal of Stop.TYWD Ransomware requires careful and immediate action to prevent further damage to your system and data. By following the steps outlined in this report, you can help ensure the safe removal of the malware and restore access to your encrypted files. Remember, prevention is key; always be cautious when opening emails or downloading software from the internet, and keep your operating system and security software up to date to protect against future threats.

Analysis Report

General information

Family Name:	Stop.TYWD Ransomware
Signature status:	No Signature

Known Samples

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Known Samples

This section lists other file samples believed to be associated with this family.

MD5: e2d9c67fb13d73f9be13566c7ed5bea7 SHA1: 71cb010b878e28a821c8bbd7bb0b7df6f11291e9 SHA256: 0DEF328DAE3EC5A225D79E8DBD29C18D086FF349184E8B35E82C491B7DF1BAA3 File Size: 404.99 KB, 404992 bytes

Windows Portable Executable Attributes

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Windows Portable Executable Attributes

This section lists file attributes found within family samples. These attributes are extracted from the files’ Windows PE (Portable Executable) specification and various system flags. Portable Executable Attributes give malware researchers insight into a file’s functionality, executable details, platform and runtime environment.

• File doesn't have "Rich" header
• File doesn't have exports table
• File doesn't have security information
• File is 32-bit executable
• File is either console or GUI application
• File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
• File is Native application (NOT .NET application)
• File is not packed
• IMAGE_FILE_DLL is not set inside PE header (Executable)
• IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Icons

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File Icons

This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.

Windows PE Version Information

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Windows PE Version Information

This section displays values and attributes that have been set in the Windows file version information data structure for samples within this family. To mislead users, malware actors often add fake version information mimicking legitimate software.

Name	Value
Company Name	Microsoft Corporation
File Description	Win32 Cabinet Self-Extractor
File Version	11.00.17763.1 (WinBuild.160101.0800)
Internal Name	Wextract
Legal Copyright	© Microsoft Corporation. All rights reserved.
Original Filename	WEXTRACT.EXE .MUI
Product Name	Internet Explorer
Product Version	11.00.17763.1

File Traits

• HighEntropy
• x86

Files Modified

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Files Modified

This section lists files that were created, modified, moved and/or deleted by samples in this family. File system activity can provide valuable insight into how malware functions on the operating system.

File	Attributes
\device\namedpipe\gmdasllogger	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\pro4542.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\pro4542.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\qu4632.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\qu4632.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete

Registry Modifications

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Registry Modifications

This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.

Key::Value	Data	API Name
HKLM\software\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup0	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Gdhleeie\AppData\Local\Temp\IXP000.TMP\"	RegNtPreCreateKey

Windows API Usage

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Windows API Usage

This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.

Category	API
Process Manipulation Evasion	NtUnmapViewOfSection
Process Shell Execute	CreateProcess
Syscall Use	ntdll.dll!NtAlpcSendWaitReceivePort ntdll.dll!NtClearEvent ntdll.dll!NtClose ntdll.dll!NtCreateEvent ntdll.dll!NtCreateMutant ntdll.dll!NtCreatePrivateNamespace ntdll.dll!NtCreateSection ntdll.dll!NtCreateThreadEx ntdll.dll!NtDelayExecution ntdll.dll!NtDuplicateObject Show More ntdll.dll!NtEnumerateKey ntdll.dll!NtEnumerateValueKey ntdll.dll!NtFlushProcessWriteBuffers ntdll.dll!NtFreeVirtualMemory ntdll.dll!NtMapViewOfSection ntdll.dll!NtOpenDirectoryObject ntdll.dll!NtOpenEvent ntdll.dll!NtOpenFile ntdll.dll!NtOpenKey ntdll.dll!NtOpenKeyEx ntdll.dll!NtOpenProcess ntdll.dll!NtOpenProcessToken ntdll.dll!NtOpenSection ntdll.dll!NtOpenThreadToken ntdll.dll!NtProtectVirtualMemory ntdll.dll!NtQueryAttributesFile ntdll.dll!NtQueryDefaultLocale ntdll.dll!NtQueryDirectoryFileEx ntdll.dll!NtQueryFullAttributesFile ntdll.dll!NtQueryInformationFile ntdll.dll!NtQueryInformationJobObject ntdll.dll!NtQueryInformationProcess ntdll.dll!NtQueryInformationThread ntdll.dll!NtQueryInformationToken ntdll.dll!NtQueryKey ntdll.dll!NtQueryLicenseValue ntdll.dll!NtQueryPerformanceCounter ntdll.dll!NtQuerySecurityAttributesToken ntdll.dll!NtQuerySecurityObject ntdll.dll!NtQuerySystemInformation ntdll.dll!NtQuerySystemInformationEx ntdll.dll!NtQueryValueKey ntdll.dll!NtQueryVirtualMemory ntdll.dll!NtQueryVolumeInformationFile ntdll.dll!NtQueryWnfStateData ntdll.dll!NtReadFile ntdll.dll!NtReadRequestData ntdll.dll!NtReleaseMutant ntdll.dll!NtReleaseWorkerFactoryWorker ntdll.dll!NtResumeThread ntdll.dll!NtSetEvent ntdll.dll!NtSetInformationKey ntdll.dll!NtSetInformationProcess ntdll.dll!NtSetInformationThread ntdll.dll!NtSetInformationWorkerFactory ntdll.dll!NtTestAlert ntdll.dll!NtTraceControl ntdll.dll!NtUnmapViewOfSection ntdll.dll!NtUnmapViewOfSectionEx ntdll.dll!NtWaitForAlertByThreadId ntdll.dll!NtWaitForMultipleObjects ntdll.dll!NtWaitForSingleObject ntdll.dll!NtWaitForWorkViaWorkerFactory ntdll.dll!NtWriteFile UNKNOWN
User Data Access	GetUserName GetUserObjectInformation
Service Control	OpenSCManager OpenService StartService
Other Suspicious	AdjustTokenPrivileges
Encryption Used	BCryptOpenAlgorithmProvider

Shell Command Execution

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Shell Command Execution

This section lists Windows shell commands that are run by the samples in this family. Windows Shell commands are often leveraged by malware for nefarious purposes and can be used to elevate security privileges, download and launch other malware, exploit vulnerabilities, collect and exfiltrate data, and hide malicious activity.

C:\Users\Gdhleeie\AppData\Local\Temp\IXP000.TMP\pro4542.exe

C:\Users\Gdhleeie\AppData\Local\Temp\IXP000.TMP\qu4632.exe