Analysis
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max time kernel
149s -
max time network
149s -
platform
windows10-2004_x64 -
resource
win10v2004-20250217-en -
resource tags
arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system -
submitted
18-02-2025 17:17
Behavioral task
behavioral1
Sample
YashmaClients.exe
Resource
win7-20241010-en
windows7-x64
21 signatures
150 seconds
Behavioral task
behavioral2
Sample
YashmaClients.exe
Resource
win10v2004-20250217-en
windows10-2004-x64
24 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 behavioral2/memory/2920-1-0x0000000000A60000-0x0000000000A86000-memory.dmp family_chaos behavioral2/files/0x0005000000022b08-7.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 2972 bcdedit.exe 2012 bcdedit.exe -
pid Process 400 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-1-5-21-2278412438-3475196406-3686434223-1000\Control Panel\International\Geo\Nation YashmaClients.exe Key value queried \REGISTRY\USER\S-1-5-21-2278412438-3475196406-3686434223-1000\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 2412 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-1-5-21-2278412438-3475196406-3686434223-1000\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\Local\Microsoft\Windows\WinX\Group2\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\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\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\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\Local\Microsoft\Windows\Burn\Burn1\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\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\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\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\Favorites\Links\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\Admin\Downloads\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\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Saved 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\Desktop\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\Videos\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\All Users\Microsoft\Windows\Start Menu\Programs\StartUp\desktop.ini svchost.exe File opened for modification C:\Users\Admin\3D Objects\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\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\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\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\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\All Users\Microsoft\Windows\Start Menu\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\Accessories\desktop.ini svchost.exe File opened for modification C:\Users\Public\Downloads\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\AppData\Local\Microsoft\Windows\Application Shortcuts\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\Admin\AppData\Local\Microsoft\Windows\WinX\Group2\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\WinX\Group3\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\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-2278412438-3475196406-3686434223-1000\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\Admin\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\Accessibility\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\Default\AppData\Local\Microsoft\Windows\WinX\Group3\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\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\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Local\Microsoft\Windows\WinX\Group1\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\Public\AccountPictures\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\Admin\Music\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 1220 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2278412438-3475196406-3686434223-1000_Classes\Local Settings svchost.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 4956 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2920 YashmaClients.exe 2412 svchost.exe -
Suspicious behavior: EnumeratesProcesses 46 IoCs
pid Process 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2920 YashmaClients.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe 2412 svchost.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 2920 YashmaClients.exe Token: SeDebugPrivilege 2412 svchost.exe Token: SeBackupPrivilege 3212 vssvc.exe Token: SeRestorePrivilege 3212 vssvc.exe Token: SeAuditPrivilege 3212 vssvc.exe Token: SeIncreaseQuotaPrivilege 3940 WMIC.exe Token: SeSecurityPrivilege 3940 WMIC.exe Token: SeTakeOwnershipPrivilege 3940 WMIC.exe Token: SeLoadDriverPrivilege 3940 WMIC.exe Token: SeSystemProfilePrivilege 3940 WMIC.exe Token: SeSystemtimePrivilege 3940 WMIC.exe Token: SeProfSingleProcessPrivilege 3940 WMIC.exe Token: SeIncBasePriorityPrivilege 3940 WMIC.exe Token: SeCreatePagefilePrivilege 3940 WMIC.exe Token: SeBackupPrivilege 3940 WMIC.exe Token: SeRestorePrivilege 3940 WMIC.exe Token: SeShutdownPrivilege 3940 WMIC.exe Token: SeDebugPrivilege 3940 WMIC.exe Token: SeSystemEnvironmentPrivilege 3940 WMIC.exe Token: SeRemoteShutdownPrivilege 3940 WMIC.exe Token: SeUndockPrivilege 3940 WMIC.exe Token: SeManageVolumePrivilege 3940 WMIC.exe Token: 33 3940 WMIC.exe Token: 34 3940 WMIC.exe Token: 35 3940 WMIC.exe Token: 36 3940 WMIC.exe Token: SeIncreaseQuotaPrivilege 3940 WMIC.exe Token: SeSecurityPrivilege 3940 WMIC.exe Token: SeTakeOwnershipPrivilege 3940 WMIC.exe Token: SeLoadDriverPrivilege 3940 WMIC.exe Token: SeSystemProfilePrivilege 3940 WMIC.exe Token: SeSystemtimePrivilege 3940 WMIC.exe Token: SeProfSingleProcessPrivilege 3940 WMIC.exe Token: SeIncBasePriorityPrivilege 3940 WMIC.exe Token: SeCreatePagefilePrivilege 3940 WMIC.exe Token: SeBackupPrivilege 3940 WMIC.exe Token: SeRestorePrivilege 3940 WMIC.exe Token: SeShutdownPrivilege 3940 WMIC.exe Token: SeDebugPrivilege 3940 WMIC.exe Token: SeSystemEnvironmentPrivilege 3940 WMIC.exe Token: SeRemoteShutdownPrivilege 3940 WMIC.exe Token: SeUndockPrivilege 3940 WMIC.exe Token: SeManageVolumePrivilege 3940 WMIC.exe Token: 33 3940 WMIC.exe Token: 34 3940 WMIC.exe Token: 35 3940 WMIC.exe Token: 36 3940 WMIC.exe Token: SeBackupPrivilege 4128 wbengine.exe Token: SeRestorePrivilege 4128 wbengine.exe Token: SeSecurityPrivilege 4128 wbengine.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 2920 wrote to memory of 2412 2920 YashmaClients.exe 85 PID 2920 wrote to memory of 2412 2920 YashmaClients.exe 85 PID 2412 wrote to memory of 4368 2412 svchost.exe 86 PID 2412 wrote to memory of 4368 2412 svchost.exe 86 PID 4368 wrote to memory of 1220 4368 cmd.exe 88 PID 4368 wrote to memory of 1220 4368 cmd.exe 88 PID 4368 wrote to memory of 3940 4368 cmd.exe 91 PID 4368 wrote to memory of 3940 4368 cmd.exe 91 PID 2412 wrote to memory of 2948 2412 svchost.exe 93 PID 2412 wrote to memory of 2948 2412 svchost.exe 93 PID 2948 wrote to memory of 2972 2948 cmd.exe 95 PID 2948 wrote to memory of 2972 2948 cmd.exe 95 PID 2948 wrote to memory of 2012 2948 cmd.exe 96 PID 2948 wrote to memory of 2012 2948 cmd.exe 96 PID 2412 wrote to memory of 1408 2412 svchost.exe 97 PID 2412 wrote to memory of 1408 2412 svchost.exe 97 PID 1408 wrote to memory of 400 1408 cmd.exe 99 PID 1408 wrote to memory of 400 1408 cmd.exe 99 PID 2412 wrote to memory of 4956 2412 svchost.exe 104 PID 2412 wrote to memory of 4956 2412 svchost.exe 104 -
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:2920 -
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:2412 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:4368 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1220
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:3940
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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:2948 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2972
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2012
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:1408 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:400
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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:4956
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3212
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4128
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2996
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:3844
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
342B
MD5ee3b113d32ed8c4ee76443d3b81a72d3
SHA14042e1a579366b7c62ea5e75b7eff031b408d7bd
SHA25602132ce5b64b9bbbf77f1e6015569583f015039abb8f2ab021c9db1ae5116383
SHA512a2c00d94871d6842853ac42eb7c84c533dac1f7b875b4f4911e1298363cf703a85f64fb398bd760b51c819094f7db0047000660f0fd54ec61359a998ba5fd74b
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Filesize
1KB
MD5baf55b95da4a601229647f25dad12878
SHA1abc16954ebfd213733c4493fc1910164d825cac8
SHA256ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
SHA51224f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
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Filesize
129KB
MD515fba1967c6bcd09520811dfe34a159b
SHA1dec383511b8f764f3222798586ee22f0fda0331c
SHA256a83e19610aa006d4789bb38e18b609538befb16a1df30e1205e0c38aeda089e4
SHA512f2990e7c548f0bb18e84aeff62a38ce5d97046b44313dfda948d51efe4eac7c855b71437b57cb2e9f48453a27570559c3d6ab8349be1fdbaac44b2ef79f9dc59
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0