Analysis
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max time kernel
133s -
max time network
125s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
24-03-2024 03:11
Behavioral task
behavioral1
Sample
a4960213baa07bad3f5762d38e68449b.exe
Resource
win7-20231129-en
windows7-x64
19 signatures
150 seconds
Behavioral task
behavioral2
Sample
a4960213baa07bad3f5762d38e68449b.exe
Resource
win10v2004-20240226-en
windows10-2004-x64
22 signatures
150 seconds
General
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Target
a4960213baa07bad3f5762d38e68449b.exe
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Size
122KB
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MD5
a4960213baa07bad3f5762d38e68449b
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SHA1
ea2db256e305d0a6f69dafd2e44047d3ad7cf553
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SHA256
2ca6754227d58abaedd803ab2b4903a5d6da9967da353446dd676822f9135fe2
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SHA512
b56cbe5122392d83ce30ec3c06b5b871dae46ad5b30a6451621d4097e7a966e6d0028aafb9c98acc13c12ed115cb7c684c2cc0f30b04560fe5b0c746b5b836db
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SSDEEP
3072:lo/cxr9jx+VURz6e8FxD5KwvsJC79fMomKgc0Io+ENK:Zr9jxVYe8FxlLB9kzIvE
Score
10/10
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/1728-0-0x0000000000750000-0x0000000000774000-memory.dmp family_chaos behavioral2/files/0x000900000002320b-6.dat family_chaos -
Deletes shadow copies 2 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 4408 bcdedit.exe 4300 bcdedit.exe -
pid Process 2208 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-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation a4960213baa07bad3f5762d38e68449b.exe Key value queried \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Control Panel\International\Geo\Nation PrivateChat.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PrivateChat.url PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini PrivateChat.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\MUSTREAD.txt PrivateChat.exe -
Executes dropped EXE 1 IoCs
pid Process 3004 PrivateChat.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) 34 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Videos\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Music\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Pictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Documents\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Music\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Videos\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Desktop\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Links\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Searches\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\desktop.ini PrivateChat.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-399997616-3400990511-967324271-1000\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Documents\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini PrivateChat.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\wpbsrrq1e.jpg" PrivateChat.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_DADY&PROD_HARDDISK\4&215468A5&0&000000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName vds.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_DADY&PROD_DADY_DVD-ROM\4&215468A5&0&010000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000\FriendlyName vds.exe -
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 3920 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000_Classes\Local Settings PrivateChat.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2268 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 3004 PrivateChat.exe -
Suspicious behavior: EnumeratesProcesses 50 IoCs
pid Process 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 1728 a4960213baa07bad3f5762d38e68449b.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe 3004 PrivateChat.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 1728 a4960213baa07bad3f5762d38e68449b.exe Token: SeDebugPrivilege 3004 PrivateChat.exe Token: SeBackupPrivilege 4992 vssvc.exe Token: SeRestorePrivilege 4992 vssvc.exe Token: SeAuditPrivilege 4992 vssvc.exe Token: SeIncreaseQuotaPrivilege 4596 WMIC.exe Token: SeSecurityPrivilege 4596 WMIC.exe Token: SeTakeOwnershipPrivilege 4596 WMIC.exe Token: SeLoadDriverPrivilege 4596 WMIC.exe Token: SeSystemProfilePrivilege 4596 WMIC.exe Token: SeSystemtimePrivilege 4596 WMIC.exe Token: SeProfSingleProcessPrivilege 4596 WMIC.exe Token: SeIncBasePriorityPrivilege 4596 WMIC.exe Token: SeCreatePagefilePrivilege 4596 WMIC.exe Token: SeBackupPrivilege 4596 WMIC.exe Token: SeRestorePrivilege 4596 WMIC.exe Token: SeShutdownPrivilege 4596 WMIC.exe Token: SeDebugPrivilege 4596 WMIC.exe Token: SeSystemEnvironmentPrivilege 4596 WMIC.exe Token: SeRemoteShutdownPrivilege 4596 WMIC.exe Token: SeUndockPrivilege 4596 WMIC.exe Token: SeManageVolumePrivilege 4596 WMIC.exe Token: 33 4596 WMIC.exe Token: 34 4596 WMIC.exe Token: 35 4596 WMIC.exe Token: 36 4596 WMIC.exe Token: SeIncreaseQuotaPrivilege 4596 WMIC.exe Token: SeSecurityPrivilege 4596 WMIC.exe Token: SeTakeOwnershipPrivilege 4596 WMIC.exe Token: SeLoadDriverPrivilege 4596 WMIC.exe Token: SeSystemProfilePrivilege 4596 WMIC.exe Token: SeSystemtimePrivilege 4596 WMIC.exe Token: SeProfSingleProcessPrivilege 4596 WMIC.exe Token: SeIncBasePriorityPrivilege 4596 WMIC.exe Token: SeCreatePagefilePrivilege 4596 WMIC.exe Token: SeBackupPrivilege 4596 WMIC.exe Token: SeRestorePrivilege 4596 WMIC.exe Token: SeShutdownPrivilege 4596 WMIC.exe Token: SeDebugPrivilege 4596 WMIC.exe Token: SeSystemEnvironmentPrivilege 4596 WMIC.exe Token: SeRemoteShutdownPrivilege 4596 WMIC.exe Token: SeUndockPrivilege 4596 WMIC.exe Token: SeManageVolumePrivilege 4596 WMIC.exe Token: 33 4596 WMIC.exe Token: 34 4596 WMIC.exe Token: 35 4596 WMIC.exe Token: 36 4596 WMIC.exe Token: SeBackupPrivilege 1612 wbengine.exe Token: SeRestorePrivilege 1612 wbengine.exe Token: SeSecurityPrivilege 1612 wbengine.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 1728 wrote to memory of 3004 1728 a4960213baa07bad3f5762d38e68449b.exe 100 PID 1728 wrote to memory of 3004 1728 a4960213baa07bad3f5762d38e68449b.exe 100 PID 3004 wrote to memory of 1340 3004 PrivateChat.exe 104 PID 3004 wrote to memory of 1340 3004 PrivateChat.exe 104 PID 1340 wrote to memory of 3920 1340 cmd.exe 106 PID 1340 wrote to memory of 3920 1340 cmd.exe 106 PID 1340 wrote to memory of 4596 1340 cmd.exe 109 PID 1340 wrote to memory of 4596 1340 cmd.exe 109 PID 3004 wrote to memory of 2716 3004 PrivateChat.exe 110 PID 3004 wrote to memory of 2716 3004 PrivateChat.exe 110 PID 2716 wrote to memory of 4408 2716 cmd.exe 112 PID 2716 wrote to memory of 4408 2716 cmd.exe 112 PID 2716 wrote to memory of 4300 2716 cmd.exe 113 PID 2716 wrote to memory of 4300 2716 cmd.exe 113 PID 3004 wrote to memory of 2848 3004 PrivateChat.exe 114 PID 3004 wrote to memory of 2848 3004 PrivateChat.exe 114 PID 2848 wrote to memory of 2208 2848 cmd.exe 116 PID 2848 wrote to memory of 2208 2848 cmd.exe 116 PID 3004 wrote to memory of 2268 3004 PrivateChat.exe 120 PID 3004 wrote to memory of 2268 3004 PrivateChat.exe 120 -
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\a4960213baa07bad3f5762d38e68449b.exe"C:\Users\Admin\AppData\Local\Temp\a4960213baa07bad3f5762d38e68449b.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1728 -
C:\Users\Admin\AppData\Roaming\PrivateChat.exe"C:\Users\Admin\AppData\Roaming\PrivateChat.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3004 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1340 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:3920
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:4596
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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:2716 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:4408
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:4300
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2848 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2208
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\MUSTREAD.txt3⤵
- Opens file in notepad (likely ransom note)
PID:2268
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4992
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1612
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:5024
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:740
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
122KB
MD5a4960213baa07bad3f5762d38e68449b
SHA1ea2db256e305d0a6f69dafd2e44047d3ad7cf553
SHA2562ca6754227d58abaedd803ab2b4903a5d6da9967da353446dd676822f9135fe2
SHA512b56cbe5122392d83ce30ec3c06b5b871dae46ad5b30a6451621d4097e7a966e6d0028aafb9c98acc13c12ed115cb7c684c2cc0f30b04560fe5b0c746b5b836db
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Filesize
510B
MD508dd3f6950280cf6839b09c5a090f70a
SHA113d8c41b481b7b2cc885c06a83e979d57fd470b0
SHA2563a58a8f73b2c6c44f573d4538b990843840514ee0c76ff3ea00dd152d2c95c36
SHA512ca5fa6803741d00f32712241109e46bc311b29d2adb2bd2a4f2f2829d86a10d583bc0bc6fdc96f6061da435c5b4304802867c31bd60d59449e8b79df50757ebe