Analysis
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max time kernel
45s -
max time network
140s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
17-12-2024 18:25
Static task
static1
Behavioral task
behavioral1
Sample
2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe
Resource
win10v2004-20241007-en
General
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Target
2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe
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Size
384KB
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MD5
67164c4680d767fcc5dbe48c3586444c
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SHA1
059cea33a907a59d6f41b2aceef3571bf2a4ceb0
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SHA256
9c21c7149cf5980ee64d5fbb3f78a336b122cf7e92335718bcc5fa45e9dafb25
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SHA512
0db0054182afcb6c3b8564457224598985958fe409503a3b1954852bd9f54ecb5ee0bb68d7a8551f369836d7e825c1bb6cda9f47f66aa43ce10d6f1b30bfe31a
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SSDEEP
6144:f5yaWtrA/WSo1rl3ALrlHQpn0BwK3SBDmhYfFQ:fTW6WSofcZ+KCIG
Malware Config
Extracted
F:\RyukReadMe.txt
ryuk
14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk
Signatures
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Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
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Ryuk family
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Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation 2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe Key value queried \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation yVzMR.exe -
Deletes itself 1 IoCs
pid Process 2968 yVzMR.exe -
Executes dropped EXE 1 IoCs
pid Process 2968 yVzMR.exe -
Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchos = "C:\\users\\Public\\yVzMR.exe" reg.exe -
Drops file in Program Files directory 64 IoCs
description ioc Process File opened for modification C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\ImportExport.docm sihost.exe File opened for modification C:\Program Files\Java\jdk-1.8\jre\lib\images\cursors\win32_MoveNoDrop32x32.gif sihost.exe File opened for modification C:\Program Files\Java\jre-1.8\legal\jdk\lcms.md sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019R_Retail-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\7-Zip\Lang\zh-tw.txt sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\TrebuchetMs.xml sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_OEM_Perp4-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\HomeStudentVNextR_Trial-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_Grace-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProjectProR_Trial-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_Retail-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProPlusMSDNR_Retail-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Java\jre-1.8\lib\cmm\sRGB.pf sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessDemoR_BypassTrial365-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\MondoR_Subscription-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\PowerPoint2019R_Trial-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\PowerPointR_Retail-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProfessionalPipcR_OEM_Perp-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_OEM_Perp5-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\SkypeforBusinessEntryR_PrepidBypass-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\Microsoft.NETCore.App.runtimeconfig.json sihost.exe File opened for modification C:\Program Files\Java\jdk-1.8\jre\lib\deploy\splash_11-lic.gif sihost.exe File opened for modification C:\Program Files\Common Files\microsoft shared\ink\ThirdPartyNotices.MSHWLatin.txt sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProfessionalR_Retail-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProjectStd2019R_Grace-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Common Files\System\ado\en-US\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Java\jdk-1.8\jre\legal\jdk\libpng.md sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\Personal2019R_Retail-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Common Files\microsoft shared\ink\sr-Latn-RS\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Document Themes 16\Gallery.thmx sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\fre\StartMenu_Win7.wmv sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Blue Green.xml sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Colors\Red.xml sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\Excel2019R_Grace-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\HomeBusiness2019R_OEM_Perp-ul-phn.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProfessionalR_OEM_Perp-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProjectStd2019VL_MAK_AE-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\7-Zip\readme.txt sihost.exe File opened for modification C:\Program Files\Java\jre-1.8\legal\jdk\freebxml.md sihost.exe File opened for modification C:\Program Files\Java\jre-1.8\lib\ext\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial2-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\O365ProPlusR_SubTrial4-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProjectProCO365R_SubTest-pl.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProPlusMSDNR_Retail-ul-phn.xrm-ms sihost.exe File opened for modification C:\Program Files\Common Files\microsoft shared\ink\pl-PL\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Common Files\microsoft shared\Source Engine\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Crashpad\attachments\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Internet Explorer\uk-UA\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Java\jdk-1.8\jre\lib\ext\sunjce_provider.jar sihost.exe File opened for modification C:\Program Files\Java\jdk-1.8\jre\lib\fontconfig.properties.src sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\OutlookR_OEM_Perp-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\OutlookR_Retail-ul-phn.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProjectPro2019DemoR_BypassTrial180-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Integration\C2RManifest.Excel.Excel.x-none.msi.16.x-none.xml sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_Grace-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\insert\insertbase.xml sihost.exe File opened for modification C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\symbols.xml sihost.exe File opened for modification C:\Program Files\dotnet\swidtag\RyukReadMe.txt sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\PowerPoint2019VL_MAK_AE-ul-oob.xrm-ms sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019R_Grace-ppd.xrm-ms sihost.exe File opened for modification C:\Program Files\InstallPublish.dotx sihost.exe File opened for modification C:\Program Files\Java\jdk-1.8\lib\ant-javafx.jar sihost.exe File opened for modification C:\Program Files\Microsoft Office\root\Licenses16\OneNoteVL_MAK-ul-oob.xrm-ms sihost.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language 2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 2968 yVzMR.exe 2968 yVzMR.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
description pid Process Token: SeDebugPrivilege 2968 yVzMR.exe -
Suspicious use of WriteProcessMemory 17 IoCs
description pid Process procid_target PID 1960 wrote to memory of 2968 1960 2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe 82 PID 1960 wrote to memory of 2968 1960 2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe 82 PID 2968 wrote to memory of 4812 2968 yVzMR.exe 85 PID 2968 wrote to memory of 4812 2968 yVzMR.exe 85 PID 2968 wrote to memory of 2640 2968 yVzMR.exe 44 PID 4812 wrote to memory of 3804 4812 cmd.exe 87 PID 4812 wrote to memory of 3804 4812 cmd.exe 87 PID 2968 wrote to memory of 2684 2968 yVzMR.exe 45 PID 2968 wrote to memory of 2876 2968 yVzMR.exe 51 PID 2968 wrote to memory of 3608 2968 yVzMR.exe 57 PID 2968 wrote to memory of 3796 2968 yVzMR.exe 58 PID 2968 wrote to memory of 3896 2968 yVzMR.exe 59 PID 2968 wrote to memory of 3964 2968 yVzMR.exe 60 PID 2968 wrote to memory of 4068 2968 yVzMR.exe 61 PID 2968 wrote to memory of 3420 2968 yVzMR.exe 62 PID 2968 wrote to memory of 1484 2968 yVzMR.exe 64 PID 2968 wrote to memory of 60 2968 yVzMR.exe 75
Processes
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C:\Windows\system32\sihost.exesihost.exe1⤵
- Drops file in Program Files directory
PID:2640
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc1⤵PID:2684
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C:\Windows\system32\taskhostw.exetaskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}1⤵PID:2876
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc1⤵PID:3608
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C:\Windows\system32\DllHost.exeC:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}1⤵PID:3796
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C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe"C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca1⤵PID:3896
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C:\Windows\System32\RuntimeBroker.exeC:\Windows\System32\RuntimeBroker.exe -Embedding1⤵PID:3964
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C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe"C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca1⤵PID:4068
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C:\Windows\System32\RuntimeBroker.exeC:\Windows\System32\RuntimeBroker.exe -Embedding1⤵PID:3420
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C:\Windows\System32\RuntimeBroker.exeC:\Windows\System32\RuntimeBroker.exe -Embedding1⤵PID:1484
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C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputHost.exe"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\InputApp\TextInputHost.exe" -ServerName:InputApp.AppX9jnwykgrccxc8by3hsrsh07r423xzvav.mca1⤵PID:60
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C:\Users\Admin\AppData\Local\Temp\2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe"C:\Users\Admin\AppData\Local\Temp\2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe"1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1960 -
C:\users\Public\yVzMR.exe"C:\users\Public\yVzMR.exe" C:\Users\Admin\AppData\Local\Temp\2024-12-17_67164c4680d767fcc5dbe48c3586444c_luca-stealer_ryuk.exe2⤵
- Checks computer location settings
- Deletes itself
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2968 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\yVzMR.exe" /f3⤵
- Suspicious use of WriteProcessMemory
PID:4812 -
C:\Windows\system32\reg.exeREG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\yVzMR.exe" /f4⤵
- Adds Run key to start application
PID:3804
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C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe"C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca1⤵PID:29428
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\ProgramData\Microsoft\ClickToRun\MachineData\Catalog\Packages\{9AC08E99-230B-47E8-9721-4577B7F124EA}\{1A8308C7-90D1-4200-B16E-646F163A08E8}\Manifest.xml
Filesize3.3MB
MD5cb63f37966df81d1013dd1f8c21d9d87
SHA1b597d406db7a924da9f6bf661dede6391bc9804a
SHA256462e273737ad2ed421e2fc4e0f883d61c283176b2665b7b33036079e0dc468f6
SHA51283f71b3e19ca95d855a51aced4f2cbb385a3f2d3cf82c80ce8d97ca2854f140887706dba607518aadfd639e6d72bd0bab64e1f165f60d3410b33f47bfed8f48b
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Filesize
170KB
MD531bd0f224e7e74eee2847f43aae23974
SHA192e331e1e8ad30538f38dd7ba31386afafa14a58
SHA2568b0a5fb13309623c3518473551cb1f55d38d8450129d4a3c16b476f7b2867d7d
SHA512a13f05a12b084ef425f542ff4be824bbccb5dbdfe085af8b7e19d81a6bcba4b8c1debcc38f6b57bc9265a4db21eed70852ece8cc62b3ef14c47fca3035a55249
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Filesize
804B
MD5cd99cba6153cbc0b14b7a849e4d0180f
SHA1375961866404a705916cbc6cd4915de7d9778923
SHA25674c43a177917b1d57ea2eaf6212ccf3b9012b4d68bc45284349443eed0bf5ee2
SHA5120c9f250c0e2ec9736b072a9807b6c3bec4b670ab2f511e65cf5d79e9a8c9a209eb91736ce2765b52b6d94a57c6aa1c16bb08e16727660699b70608439c8b7cda