Analysis
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max time kernel
24s -
max time network
110s -
platform
windows10_x64 -
resource
win10v20210408 -
submitted
12-05-2021 14:08
Static task
static1
Behavioral task
behavioral1
Sample
3808f21e_by_Libranalysis.exe
Resource
win7v20210408
windows7_x64
0 signatures
0 seconds
Behavioral task
behavioral2
Sample
3808f21e_by_Libranalysis.exe
Resource
win10v20210408
windows10_x64
0 signatures
0 seconds
General
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Target
3808f21e_by_Libranalysis.exe
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Size
66KB
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MD5
3808f21e56dede99bc914d90aeabe47a
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SHA1
93cc73149d4bb34830a2cb2a3047e9267b9e3080
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SHA256
4a5ac3c6f8383cc33c795804ba5f7f5553c029bbb4a6d28f1e4d8fb5107902c1
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SHA512
4ae55145cca3a6f1ed3feff5b2bd38121e37c4cc528e08d5de771bcc4855994560bfc8c22898d73c5b259e37d2dc803615b8f6ec859e53918bd7a1ffee9316b3
Score
10/10
Malware Config
Signatures
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MountLocker Ransomware
Ransomware family first seen in late 2020, which threatens to leak files if ransom is not paid.
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Modifies extensions of user files 8 IoCs
Ransomware generally changes the extension on encrypted files.
description ioc Process File renamed C:\Users\Admin\Pictures\ReadOptimize.raw => \??\c:\Users\Admin\Pictures\ReadOptimize.raw.ReadManual.F638D8A0 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Pictures\RequestAdd.tiff 3808f21e_by_Libranalysis.exe File renamed C:\Users\Admin\Pictures\RequestAdd.tiff => \??\c:\Users\Admin\Pictures\RequestAdd.tiff.ReadManual.F638D8A0 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Pictures\StopUninstall.tiff 3808f21e_by_Libranalysis.exe File renamed C:\Users\Admin\Pictures\StopUninstall.tiff => \??\c:\Users\Admin\Pictures\StopUninstall.tiff.ReadManual.F638D8A0 3808f21e_by_Libranalysis.exe File renamed C:\Users\Admin\Pictures\TraceSet.tif => \??\c:\Users\Admin\Pictures\TraceSet.tif.ReadManual.F638D8A0 3808f21e_by_Libranalysis.exe File renamed C:\Users\Admin\Pictures\UnregisterMerge.raw => \??\c:\Users\Admin\Pictures\UnregisterMerge.raw.ReadManual.F638D8A0 3808f21e_by_Libranalysis.exe File renamed C:\Users\Admin\Pictures\EnterExport.raw => \??\c:\Users\Admin\Pictures\EnterExport.raw.ReadManual.F638D8A0 3808f21e_by_Libranalysis.exe -
Drops desktop.ini file(s) 24 IoCs
description ioc Process File opened for modification \??\c:\Users\Public\Music\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\Pictures\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Favorites\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Saved Games\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Searches\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Videos\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\Documents\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Documents\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Desktop\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Links\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Music\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\OneDrive\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\AccountPictures\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\Desktop\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Contacts\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Favorites\Links\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Pictures\Camera Roll\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Pictures\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Pictures\Saved Pictures\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\Downloads\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\Libraries\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Public\Videos\desktop.ini 3808f21e_by_Libranalysis.exe File opened for modification \??\c:\Users\Admin\Downloads\desktop.ini 3808f21e_by_Libranalysis.exe -
Drops file in Program Files directory 2 IoCs
description ioc Process File created \??\c:\Program Files\RecoveryManual.html 3808f21e_by_Libranalysis.exe File created \??\c:\Program Files (x86)\RecoveryManual.html 3808f21e_by_Libranalysis.exe -
Modifies registry class 5 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.F638D8A0\shell\Open\command 3808f21e_by_Libranalysis.exe Key created \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.F638D8A0 3808f21e_by_Libranalysis.exe Key created \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.F638D8A0\shell 3808f21e_by_Libranalysis.exe Key created \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.F638D8A0\shell\Open 3808f21e_by_Libranalysis.exe Set value (str) \REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.F638D8A0\shell\Open\command\ = "explorer.exe RecoveryManual.html" 3808f21e_by_Libranalysis.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 640 3808f21e_by_Libranalysis.exe 640 3808f21e_by_Libranalysis.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeRestorePrivilege 640 3808f21e_by_Libranalysis.exe Token: SeDebugPrivilege 640 3808f21e_by_Libranalysis.exe -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 640 wrote to memory of 2252 640 3808f21e_by_Libranalysis.exe 75 PID 640 wrote to memory of 2252 640 3808f21e_by_Libranalysis.exe 75 PID 2252 wrote to memory of 3548 2252 cmd.exe 78 PID 2252 wrote to memory of 3548 2252 cmd.exe 78 -
Views/modifies file attributes 1 TTPs 1 IoCs
pid Process 3548 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\3808f21e_by_Libranalysis.exe"C:\Users\Admin\AppData\Local\Temp\3808f21e_by_Libranalysis.exe"1⤵
- Modifies extensions of user files
- Drops desktop.ini file(s)
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:640 -
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\\0F74C74D.bat" "C:\Users\Admin\AppData\Local\Temp\3808f21e_by_Libranalysis.exe""2⤵
- Suspicious use of WriteProcessMemory
PID:2252 -
C:\Windows\system32\attrib.exeattrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\3808f21e_by_Libranalysis.exe"3⤵
- Views/modifies file attributes
PID:3548
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