Resubmissions
19-02-2025 03:41
250219-d8y8vawnam 10Analysis
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max time kernel
71s -
max time network
72s -
platform
windows10-2004_x64 -
resource
win10v2004-20250217-en -
resource tags
arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system -
submitted
19-02-2025 03:41
Behavioral task
behavioral1
Sample
YashmaClients.exe
Resource
win10v2004-20250217-en
windows10-2004-x64
24 signatures
150 seconds
Behavioral task
behavioral2
Sample
YashmaClients.exe
Resource
android-x64-20240624-en
android-10-x64
0 signatures
150 seconds
General
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Target
YashmaClients.exe
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Size
129KB
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MD5
15fba1967c6bcd09520811dfe34a159b
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SHA1
dec383511b8f764f3222798586ee22f0fda0331c
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SHA256
a83e19610aa006d4789bb38e18b609538befb16a1df30e1205e0c38aeda089e4
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SHA512
f2990e7c548f0bb18e84aeff62a38ce5d97046b44313dfda948d51efe4eac7c855b71437b57cb2e9f48453a27570559c3d6ab8349be1fdbaac44b2ef79f9dc59
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SSDEEP
768:x7zxAmU2NJ1KQxJPho9aT3e82hQfMCwRhOF15utoS:xND3x7Pq9m3ZsA/wCFLS
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/1032-1-0x0000000000E00000-0x0000000000E26000-memory.dmp family_chaos behavioral1/files/0x000e000000023b87-7.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 4392 bcdedit.exe 2656 bcdedit.exe -
pid Process 1044 wbadmin.exe -
Disables Task Manager via registry modification
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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-1-5-21-1479699283-3000499823-2337359760-1000\Control Panel\International\Geo\Nation YashmaClients.exe Key value queried \REGISTRY\USER\S-1-5-21-1479699283-3000499823-2337359760-1000\Control Panel\International\Geo\Nation svchost.exe -
Drops startup file 2 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 4144 svchost.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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Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1479699283-3000499823-2337359760-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\UpdateTask = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe" svchost.exe -
Drops desktop.ini file(s) 64 IoCs
description ioc Process File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Windows PowerShell\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini svchost.exe File opened for modification C:\Users\Public\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn2\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Local\Microsoft\Windows\WinX\Group3\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group1\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\StartUp\desktop.ini svchost.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Application Shortcuts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Admin\3D Objects\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Local\Microsoft\Windows\WinX\Group2\desktop.ini svchost.exe File opened for modification C:\Users\Public\AccountPictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group2\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\System Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn1\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-1479699283-3000499823-2337359760-1000\desktop.ini svchost.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 opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_WDC&PROD_WDS100T2B0A\4&215468A5&0&000000 vds.exe 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 -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 1576 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-1479699283-3000499823-2337359760-1000_Classes\Local Settings svchost.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2776 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 1032 YashmaClients.exe 4144 svchost.exe -
Suspicious behavior: EnumeratesProcesses 48 IoCs
pid Process 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 1032 YashmaClients.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe 4144 svchost.exe -
Suspicious use of AdjustPrivilegeToken 55 IoCs
description pid Process Token: SeDebugPrivilege 1032 YashmaClients.exe Token: SeDebugPrivilege 4144 svchost.exe Token: SeBackupPrivilege 2180 vssvc.exe Token: SeRestorePrivilege 2180 vssvc.exe Token: SeAuditPrivilege 2180 vssvc.exe Token: SeIncreaseQuotaPrivilege 2588 WMIC.exe Token: SeSecurityPrivilege 2588 WMIC.exe Token: SeTakeOwnershipPrivilege 2588 WMIC.exe Token: SeLoadDriverPrivilege 2588 WMIC.exe Token: SeSystemProfilePrivilege 2588 WMIC.exe Token: SeSystemtimePrivilege 2588 WMIC.exe Token: SeProfSingleProcessPrivilege 2588 WMIC.exe Token: SeIncBasePriorityPrivilege 2588 WMIC.exe Token: SeCreatePagefilePrivilege 2588 WMIC.exe Token: SeBackupPrivilege 2588 WMIC.exe Token: SeRestorePrivilege 2588 WMIC.exe Token: SeShutdownPrivilege 2588 WMIC.exe Token: SeDebugPrivilege 2588 WMIC.exe Token: SeSystemEnvironmentPrivilege 2588 WMIC.exe Token: SeRemoteShutdownPrivilege 2588 WMIC.exe Token: SeUndockPrivilege 2588 WMIC.exe Token: SeManageVolumePrivilege 2588 WMIC.exe Token: 33 2588 WMIC.exe Token: 34 2588 WMIC.exe Token: 35 2588 WMIC.exe Token: 36 2588 WMIC.exe Token: SeIncreaseQuotaPrivilege 2588 WMIC.exe Token: SeSecurityPrivilege 2588 WMIC.exe Token: SeTakeOwnershipPrivilege 2588 WMIC.exe Token: SeLoadDriverPrivilege 2588 WMIC.exe Token: SeSystemProfilePrivilege 2588 WMIC.exe Token: SeSystemtimePrivilege 2588 WMIC.exe Token: SeProfSingleProcessPrivilege 2588 WMIC.exe Token: SeIncBasePriorityPrivilege 2588 WMIC.exe Token: SeCreatePagefilePrivilege 2588 WMIC.exe Token: SeBackupPrivilege 2588 WMIC.exe Token: SeRestorePrivilege 2588 WMIC.exe Token: SeShutdownPrivilege 2588 WMIC.exe Token: SeDebugPrivilege 2588 WMIC.exe Token: SeSystemEnvironmentPrivilege 2588 WMIC.exe Token: SeRemoteShutdownPrivilege 2588 WMIC.exe Token: SeUndockPrivilege 2588 WMIC.exe Token: SeManageVolumePrivilege 2588 WMIC.exe Token: 33 2588 WMIC.exe Token: 34 2588 WMIC.exe Token: 35 2588 WMIC.exe Token: 36 2588 WMIC.exe Token: SeBackupPrivilege 4188 wbengine.exe Token: SeRestorePrivilege 4188 wbengine.exe Token: SeSecurityPrivilege 4188 wbengine.exe Token: SeBackupPrivilege 3988 svchost.exe Token: SeRestorePrivilege 3988 svchost.exe Token: SeSecurityPrivilege 3988 svchost.exe Token: SeTakeOwnershipPrivilege 3988 svchost.exe Token: 35 3988 svchost.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 1032 wrote to memory of 4144 1032 YashmaClients.exe 88 PID 1032 wrote to memory of 4144 1032 YashmaClients.exe 88 PID 4144 wrote to memory of 4828 4144 svchost.exe 89 PID 4144 wrote to memory of 4828 4144 svchost.exe 89 PID 4828 wrote to memory of 1576 4828 cmd.exe 91 PID 4828 wrote to memory of 1576 4828 cmd.exe 91 PID 4828 wrote to memory of 2588 4828 cmd.exe 94 PID 4828 wrote to memory of 2588 4828 cmd.exe 94 PID 4144 wrote to memory of 4448 4144 svchost.exe 96 PID 4144 wrote to memory of 4448 4144 svchost.exe 96 PID 4448 wrote to memory of 4392 4448 cmd.exe 98 PID 4448 wrote to memory of 4392 4448 cmd.exe 98 PID 4448 wrote to memory of 2656 4448 cmd.exe 99 PID 4448 wrote to memory of 2656 4448 cmd.exe 99 PID 4144 wrote to memory of 3560 4144 svchost.exe 100 PID 4144 wrote to memory of 3560 4144 svchost.exe 100 PID 3560 wrote to memory of 1044 3560 cmd.exe 102 PID 3560 wrote to memory of 1044 3560 cmd.exe 102 PID 4144 wrote to memory of 2776 4144 svchost.exe 107 PID 4144 wrote to memory of 2776 4144 svchost.exe 107 -
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\YashmaClients.exe"C:\Users\Admin\AppData\Local\Temp\YashmaClients.exe"1⤵
- Checks computer location settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1032 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Adds Run key to start application
- Drops desktop.ini file(s)
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4144 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:4828 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1576
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2588
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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:4448 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:4392
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2656
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:3560 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1044
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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:2776
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2180
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4188
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:3024
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:2360
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k SDRSVC1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3988
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C:\Windows\system32\taskmgr.exe"C:\Windows\system32\taskmgr.exe" /41⤵PID:2772
Network
MITRE ATT&CK Enterprise v15
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Defense Evasion
Direct Volume Access
1Indicator Removal
3File Deletion
3Modify Registry
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
1KB
MD5baf55b95da4a601229647f25dad12878
SHA1abc16954ebfd213733c4493fc1910164d825cac8
SHA256ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
SHA51224f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
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Filesize
342B
MD5ee3b113d32ed8c4ee76443d3b81a72d3
SHA14042e1a579366b7c62ea5e75b7eff031b408d7bd
SHA25602132ce5b64b9bbbf77f1e6015569583f015039abb8f2ab021c9db1ae5116383
SHA512a2c00d94871d6842853ac42eb7c84c533dac1f7b875b4f4911e1298363cf703a85f64fb398bd760b51c819094f7db0047000660f0fd54ec61359a998ba5fd74b
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Filesize
129KB
MD515fba1967c6bcd09520811dfe34a159b
SHA1dec383511b8f764f3222798586ee22f0fda0331c
SHA256a83e19610aa006d4789bb38e18b609538befb16a1df30e1205e0c38aeda089e4
SHA512f2990e7c548f0bb18e84aeff62a38ce5d97046b44313dfda948d51efe4eac7c855b71437b57cb2e9f48453a27570559c3d6ab8349be1fdbaac44b2ef79f9dc59
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0