Analysis
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max time kernel
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max time network
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platform
windows10-ltsc_2021_x64 -
resource
win10ltsc2021-20250314-en -
resource tags
arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system -
submitted
22/03/2025, 17:59
Behavioral task
behavioral1
Sample
stub.exe
Resource
win10ltsc2021-20250314-en
General
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Target
stub.exe
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Size
22KB
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MD5
8b75fae87885a0b1a0c3c2b601d6e399
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SHA1
120224bd569c681c4cbdf879f341145081bd9317
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SHA256
a00428527fb92182aa0fce541e09b4d7dcb19b00af756f5e15c2dc7c6747bf93
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SHA512
6719ae41b3918ba58a036e57720303f2b864797b77863834de14451bf8b524c6138e3ab74237258b2a32b8d04498debcda593adbcf418565e714f0506dd5f3c9
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SSDEEP
384:13MLWHn3kIkfMU9asv1zpd8R4+CTJJr91Cz7bSbeS:Fn3kInqLvFp64+6Jr9i7baeS
Malware Config
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 2 IoCs
resource yara_rule behavioral1/memory/3272-0-0x0000000000550000-0x000000000055C000-memory.dmp family_chaos behavioral1/files/0x00080000000281e7-2.dat family_chaos -
Chaos family
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Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
pid Process 4684 bcdedit.exe 4704 bcdedit.exe -
pid Process 4944 wbadmin.exe -
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-1-5-21-780313508-644878201-565826771-1000\Control Panel\International\Geo\Nation stub.exe Key value queried \REGISTRY\USER\S-1-5-21-780313508-644878201-565826771-1000\Control Panel\International\Geo\Nation stub.exe -
Drops startup file 3 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini stub.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt stub.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\stub.url stub.exe -
Executes dropped EXE 1 IoCs
pid Process 4416 stub.exe -
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Drops desktop.ini file(s) 31 IoCs
description ioc Process File opened for modification C:\Users\Admin\Desktop\desktop.ini stub.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini stub.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-780313508-644878201-565826771-1000\desktop.ini stub.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini stub.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini stub.exe File opened for modification C:\Users\Admin\Documents\desktop.ini stub.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini stub.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini stub.exe File opened for modification C:\Users\Admin\Searches\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini stub.exe File opened for modification C:\Users\Public\Videos\desktop.ini stub.exe File opened for modification C:\Users\Public\Pictures\desktop.ini stub.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini stub.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini stub.exe File opened for modification C:\Users\Admin\Music\desktop.ini stub.exe File opened for modification C:\Users\Admin\Videos\desktop.ini stub.exe File opened for modification C:\Users\Public\Music\desktop.ini stub.exe File opened for modification C:\Users\Public\Desktop\desktop.ini stub.exe File opened for modification C:\Users\Admin\Links\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini stub.exe File opened for modification C:\Users\Public\Documents\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini stub.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini stub.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Checks SCSI registry key(s) 3 TTPs 4 IoCs
SCSI information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName vds.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_QEMU&PROD_QEMU_DVD-ROM\4&215468A5&0&010000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName vds.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_WDC&PROD_WDS100T2B0A\4&215468A5&0&000000 vds.exe -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 5232 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-780313508-644878201-565826771-1000_Classes\Local Settings stub.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1048 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 4416 stub.exe 3988 vlc.exe -
Suspicious behavior: EnumeratesProcesses 49 IoCs
pid Process 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 3272 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 4416 stub.exe 3252 WMIC.exe 3252 WMIC.exe 3252 WMIC.exe 3252 WMIC.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 3988 vlc.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 3272 stub.exe Token: SeDebugPrivilege 4416 stub.exe Token: SeBackupPrivilege 2816 vssvc.exe Token: SeRestorePrivilege 2816 vssvc.exe Token: SeAuditPrivilege 2816 vssvc.exe Token: SeIncreaseQuotaPrivilege 3252 WMIC.exe Token: SeSecurityPrivilege 3252 WMIC.exe Token: SeTakeOwnershipPrivilege 3252 WMIC.exe Token: SeLoadDriverPrivilege 3252 WMIC.exe Token: SeSystemProfilePrivilege 3252 WMIC.exe Token: SeSystemtimePrivilege 3252 WMIC.exe Token: SeProfSingleProcessPrivilege 3252 WMIC.exe Token: SeIncBasePriorityPrivilege 3252 WMIC.exe Token: SeCreatePagefilePrivilege 3252 WMIC.exe Token: SeBackupPrivilege 3252 WMIC.exe Token: SeRestorePrivilege 3252 WMIC.exe Token: SeShutdownPrivilege 3252 WMIC.exe Token: SeDebugPrivilege 3252 WMIC.exe Token: SeSystemEnvironmentPrivilege 3252 WMIC.exe Token: SeRemoteShutdownPrivilege 3252 WMIC.exe Token: SeUndockPrivilege 3252 WMIC.exe Token: SeManageVolumePrivilege 3252 WMIC.exe Token: 33 3252 WMIC.exe Token: 34 3252 WMIC.exe Token: 35 3252 WMIC.exe Token: 36 3252 WMIC.exe Token: SeIncreaseQuotaPrivilege 3252 WMIC.exe Token: SeSecurityPrivilege 3252 WMIC.exe Token: SeTakeOwnershipPrivilege 3252 WMIC.exe Token: SeLoadDriverPrivilege 3252 WMIC.exe Token: SeSystemProfilePrivilege 3252 WMIC.exe Token: SeSystemtimePrivilege 3252 WMIC.exe Token: SeProfSingleProcessPrivilege 3252 WMIC.exe Token: SeIncBasePriorityPrivilege 3252 WMIC.exe Token: SeCreatePagefilePrivilege 3252 WMIC.exe Token: SeBackupPrivilege 3252 WMIC.exe Token: SeRestorePrivilege 3252 WMIC.exe Token: SeShutdownPrivilege 3252 WMIC.exe Token: SeDebugPrivilege 3252 WMIC.exe Token: SeSystemEnvironmentPrivilege 3252 WMIC.exe Token: SeRemoteShutdownPrivilege 3252 WMIC.exe Token: SeUndockPrivilege 3252 WMIC.exe Token: SeManageVolumePrivilege 3252 WMIC.exe Token: 33 3252 WMIC.exe Token: 34 3252 WMIC.exe Token: 35 3252 WMIC.exe Token: 36 3252 WMIC.exe Token: SeBackupPrivilege 4868 wbengine.exe Token: SeRestorePrivilege 4868 wbengine.exe Token: SeSecurityPrivilege 4868 wbengine.exe -
Suspicious use of FindShellTrayWindow 9 IoCs
pid Process 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe -
Suspicious use of SendNotifyMessage 8 IoCs
pid Process 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe 3988 vlc.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 3988 vlc.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 3272 wrote to memory of 4416 3272 stub.exe 82 PID 3272 wrote to memory of 4416 3272 stub.exe 82 PID 4416 wrote to memory of 1732 4416 stub.exe 83 PID 4416 wrote to memory of 1732 4416 stub.exe 83 PID 1732 wrote to memory of 5232 1732 cmd.exe 85 PID 1732 wrote to memory of 5232 1732 cmd.exe 85 PID 1732 wrote to memory of 3252 1732 cmd.exe 88 PID 1732 wrote to memory of 3252 1732 cmd.exe 88 PID 4416 wrote to memory of 4656 4416 stub.exe 90 PID 4416 wrote to memory of 4656 4416 stub.exe 90 PID 4656 wrote to memory of 4684 4656 cmd.exe 92 PID 4656 wrote to memory of 4684 4656 cmd.exe 92 PID 4656 wrote to memory of 4704 4656 cmd.exe 93 PID 4656 wrote to memory of 4704 4656 cmd.exe 93 PID 4416 wrote to memory of 4780 4416 stub.exe 94 PID 4416 wrote to memory of 4780 4416 stub.exe 94 PID 4780 wrote to memory of 4944 4780 cmd.exe 96 PID 4780 wrote to memory of 4944 4780 cmd.exe 96 PID 4416 wrote to memory of 1048 4416 stub.exe 101 PID 4416 wrote to memory of 1048 4416 stub.exe 101 -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
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Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\stub.exe"C:\Users\Admin\AppData\Local\Temp\stub.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3272 -
C:\Users\Admin\AppData\Roaming\stub.exe"C:\Users\Admin\AppData\Roaming\stub.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4416 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1732 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:5232
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3252
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no3⤵
- Suspicious use of WriteProcessMemory
PID:4656 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:4684
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:4704
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:4780 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:4944
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt3⤵
- Opens file in notepad (likely ransom note)
PID:1048
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2816
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4868
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:552
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:4896
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:5244
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C:\Program Files\VideoLAN\VLC\vlc.exe"C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Downloads\RegisterSearch.wvx"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
PID:3988
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
226B
MD5b92bd19c1a9416298a873dfa43b439b7
SHA17b96a8874aff3a502363f4168332613ebc53d64e
SHA2561ac8854abd01c202cf82e4ccdf80bf50319c59bc7a02dce2b19cecfedf7dd4ba
SHA5125910691ebdd78a2740117b14f146629874682d196f518f479b8bcb754ed2501a009fc465cb9e3685f7aed8ced7b435690de2b8b8439117abb5f61dc4996387a6
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Filesize
22KB
MD58b75fae87885a0b1a0c3c2b601d6e399
SHA1120224bd569c681c4cbdf879f341145081bd9317
SHA256a00428527fb92182aa0fce541e09b4d7dcb19b00af756f5e15c2dc7c6747bf93
SHA5126719ae41b3918ba58a036e57720303f2b864797b77863834de14451bf8b524c6138e3ab74237258b2a32b8d04498debcda593adbcf418565e714f0506dd5f3c9
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Filesize
961B
MD576cf4b4b048d3adad48300ddb890b166
SHA11099a3ea6d9b92ff9e9fb1fbcaa51b907c65f911
SHA25655cd6766a0830a3e75eac538e955baa64a2aa5c7ca56661d080919cbe87ea472
SHA5120ac5807d857cf75ed64bbcd5fcd70d98e08f6a625f774da1402c56228aa492603a578d9461e388f793d3b718d7a19a659e68bb0a043013fb3ce02d71f5b20b4b