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201217-th1vrg4m2n 10Analysis
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max time kernel
88s -
max time network
111s -
platform
windows10_x64 -
resource
win10v20201028 -
submitted
17-01-2021 18:34
Static task
static1
Behavioral task
behavioral1
Sample
Joker.exe
Resource
win7v20201028
Behavioral task
behavioral2
Sample
Joker.exe
Resource
win10v20201028
General
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Target
Joker.exe
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Size
649KB
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MD5
182f7543c3686426512511c74548e724
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SHA1
3f114d85370d2014004e06bd7b10ab2ac435b482
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SHA256
49c578bf49fba965320ea05c3d1c8ef2bf37d3c8943988b50ac72fd6c3d109b7
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SHA512
3f4fc19e3687b1a4b5cb7719f21b6b51d0f7f29ed82ce51a95c1b18ecd7660391ed116df9ed132f91c10ff639875451d67baa9414721f5b52441d3d905e65e87
Malware Config
Extracted
C:\Users\Admin\Desktop\CryptoJoker Recovery Information.txt
1yh3eJjuXwqqXgpu8stnojm148b8d6NFQ
Extracted
Protocol: smtp- Host:
smtp.gmail.com - Port:
587 - Username:
theemailtologin@gmail.com - Password:
thepasswordoftheaccount
Signatures
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Modifies extensions of user files 11 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
Joker.exedescription ioc process File renamed C:\Users\Admin\Pictures\InvokeReceive.tiff => C:\Users\Admin\Pictures\InvokeReceive.tiff.partially.nocry Joker.exe File renamed C:\Users\Admin\Pictures\PopSearch.tiff => C:\Users\Admin\Pictures\PopSearch.tiff.partially.nocry Joker.exe File opened for modification C:\Users\Admin\Pictures\UnlockUninstall.tiff Joker.exe File renamed C:\Users\Admin\Pictures\UnlockUninstall.tiff => C:\Users\Admin\Pictures\UnlockUninstall.tiff.partially.nocry Joker.exe File opened for modification C:\Users\Admin\Pictures\InvokeReceive.tiff Joker.exe File opened for modification C:\Users\Admin\Pictures\PopSearch.tiff Joker.exe File renamed C:\Users\Admin\Pictures\TestConvertTo.png => C:\Users\Admin\Pictures\TestConvertTo.png.partially.nocry Joker.exe File renamed C:\Users\Admin\Pictures\AssertFind.tif => C:\Users\Admin\Pictures\AssertFind.tif.partially.nocry Joker.exe File renamed C:\Users\Admin\Pictures\BackupSync.tif => C:\Users\Admin\Pictures\BackupSync.tif.partially.nocry Joker.exe File renamed C:\Users\Admin\Pictures\CloseConvertFrom.png => C:\Users\Admin\Pictures\CloseConvertFrom.png.partially.nocry Joker.exe File renamed C:\Users\Admin\Pictures\ConvertFromTrace.raw => C:\Users\Admin\Pictures\ConvertFromTrace.raw.partially.nocry Joker.exe -
Drops startup file 1 IoCs
Processes:
Joker.exedescription ioc process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini Joker.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Drops desktop.ini file(s) 37 IoCs
Processes:
Joker.exedescription ioc process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini Joker.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini Joker.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini Joker.exe File opened for modification C:\Windows\assembly\Desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group3\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group2\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini Joker.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\Desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini Joker.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini Joker.exe File created C:\Windows\assembly\Desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group1\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Documents\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Videos\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Application Shortcuts\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Windows PowerShell\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Links\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Music\desktop.ini Joker.exe File opened for modification C:\Users\Admin\Searches\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini Joker.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini Joker.exe -
Drops file in Windows directory 3 IoCs
Processes:
Joker.exedescription ioc process File opened for modification C:\Windows\assembly Joker.exe File created C:\Windows\assembly\Desktop.ini Joker.exe File opened for modification C:\Windows\assembly\Desktop.ini Joker.exe -
Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes:
Joker.exedescription pid process Token: SeDebugPrivilege 1048 Joker.exe