Resubmissions
24-03-2024 02:10
240324-clsbcaah7w 10Analysis
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max time kernel
90s -
max time network
122s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
24-03-2024 02:10
Behavioral task
behavioral1
Sample
5d4c5f3457c4487fe26df768ed8f3d2b.exe
Resource
win7-20240221-en
windows7-x64
19 signatures
150 seconds
Behavioral task
behavioral2
Sample
5d4c5f3457c4487fe26df768ed8f3d2b.exe
Resource
win10v2004-20231215-en
windows10-2004-x64
22 signatures
150 seconds
General
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Target
5d4c5f3457c4487fe26df768ed8f3d2b.exe
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Size
120KB
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MD5
5d4c5f3457c4487fe26df768ed8f3d2b
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SHA1
f5f3df7d11e06dc158ac8183a8bde5895f8ea251
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SHA256
19c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32
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SHA512
793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a
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SSDEEP
3072:QoIcFr9LvJxaJ3e6ua0g0qcB2f/u80kcmU/C7eJBz4Jtu:dr9LvkbOqguxU6f4
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/2160-0-0x0000000000E90000-0x0000000000EB4000-memory.dmp family_chaos behavioral2/files/0x000a0000000231fc-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 2296 bcdedit.exe 3800 bcdedit.exe -
pid Process 3856 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-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation 5d4c5f3457c4487fe26df768ed8f3d2b.exe Key value queried \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\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\README.txt PrivateChat.exe -
Executes dropped EXE 1 IoCs
pid Process 2512 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\Pictures\Saved Pictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\OneDrive\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\Libraries\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 C:\Users\Public\Pictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Videos\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\Music\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\Start Menu\Programs\Accessibility\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Music\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\Windows\Recent\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Documents\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Desktop\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\Contacts\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Favorites\Links\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\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\Searches\desktop.ini PrivateChat.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-1497073144-2389943819-3385106915-1000\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\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Saved Games\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\Start Menu\Programs\Administrative Tools\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini PrivateChat.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\sgydap4cs.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 3152 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000_Classes\Local Settings PrivateChat.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 4888 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2512 PrivateChat.exe -
Suspicious behavior: EnumeratesProcesses 49 IoCs
pid Process 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe 2512 PrivateChat.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe Token: SeDebugPrivilege 2512 PrivateChat.exe Token: SeBackupPrivilege 3476 vssvc.exe Token: SeRestorePrivilege 3476 vssvc.exe Token: SeAuditPrivilege 3476 vssvc.exe Token: SeIncreaseQuotaPrivilege 3908 WMIC.exe Token: SeSecurityPrivilege 3908 WMIC.exe Token: SeTakeOwnershipPrivilege 3908 WMIC.exe Token: SeLoadDriverPrivilege 3908 WMIC.exe Token: SeSystemProfilePrivilege 3908 WMIC.exe Token: SeSystemtimePrivilege 3908 WMIC.exe Token: SeProfSingleProcessPrivilege 3908 WMIC.exe Token: SeIncBasePriorityPrivilege 3908 WMIC.exe Token: SeCreatePagefilePrivilege 3908 WMIC.exe Token: SeBackupPrivilege 3908 WMIC.exe Token: SeRestorePrivilege 3908 WMIC.exe Token: SeShutdownPrivilege 3908 WMIC.exe Token: SeDebugPrivilege 3908 WMIC.exe Token: SeSystemEnvironmentPrivilege 3908 WMIC.exe Token: SeRemoteShutdownPrivilege 3908 WMIC.exe Token: SeUndockPrivilege 3908 WMIC.exe Token: SeManageVolumePrivilege 3908 WMIC.exe Token: 33 3908 WMIC.exe Token: 34 3908 WMIC.exe Token: 35 3908 WMIC.exe Token: 36 3908 WMIC.exe Token: SeIncreaseQuotaPrivilege 3908 WMIC.exe Token: SeSecurityPrivilege 3908 WMIC.exe Token: SeTakeOwnershipPrivilege 3908 WMIC.exe Token: SeLoadDriverPrivilege 3908 WMIC.exe Token: SeSystemProfilePrivilege 3908 WMIC.exe Token: SeSystemtimePrivilege 3908 WMIC.exe Token: SeProfSingleProcessPrivilege 3908 WMIC.exe Token: SeIncBasePriorityPrivilege 3908 WMIC.exe Token: SeCreatePagefilePrivilege 3908 WMIC.exe Token: SeBackupPrivilege 3908 WMIC.exe Token: SeRestorePrivilege 3908 WMIC.exe Token: SeShutdownPrivilege 3908 WMIC.exe Token: SeDebugPrivilege 3908 WMIC.exe Token: SeSystemEnvironmentPrivilege 3908 WMIC.exe Token: SeRemoteShutdownPrivilege 3908 WMIC.exe Token: SeUndockPrivilege 3908 WMIC.exe Token: SeManageVolumePrivilege 3908 WMIC.exe Token: 33 3908 WMIC.exe Token: 34 3908 WMIC.exe Token: 35 3908 WMIC.exe Token: 36 3908 WMIC.exe Token: SeBackupPrivilege 2480 wbengine.exe Token: SeRestorePrivilege 2480 wbengine.exe Token: SeSecurityPrivilege 2480 wbengine.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 2160 wrote to memory of 2512 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 84 PID 2160 wrote to memory of 2512 2160 5d4c5f3457c4487fe26df768ed8f3d2b.exe 84 PID 2512 wrote to memory of 4916 2512 PrivateChat.exe 86 PID 2512 wrote to memory of 4916 2512 PrivateChat.exe 86 PID 4916 wrote to memory of 3152 4916 cmd.exe 88 PID 4916 wrote to memory of 3152 4916 cmd.exe 88 PID 4916 wrote to memory of 3908 4916 cmd.exe 91 PID 4916 wrote to memory of 3908 4916 cmd.exe 91 PID 2512 wrote to memory of 464 2512 PrivateChat.exe 93 PID 2512 wrote to memory of 464 2512 PrivateChat.exe 93 PID 464 wrote to memory of 2296 464 cmd.exe 95 PID 464 wrote to memory of 2296 464 cmd.exe 95 PID 464 wrote to memory of 3800 464 cmd.exe 96 PID 464 wrote to memory of 3800 464 cmd.exe 96 PID 2512 wrote to memory of 3640 2512 PrivateChat.exe 97 PID 2512 wrote to memory of 3640 2512 PrivateChat.exe 97 PID 3640 wrote to memory of 3856 3640 cmd.exe 99 PID 3640 wrote to memory of 3856 3640 cmd.exe 99 PID 2512 wrote to memory of 4888 2512 PrivateChat.exe 105 PID 2512 wrote to memory of 4888 2512 PrivateChat.exe 105 -
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\5d4c5f3457c4487fe26df768ed8f3d2b.exe"C:\Users\Admin\AppData\Local\Temp\5d4c5f3457c4487fe26df768ed8f3d2b.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2160 -
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:2512 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:4916 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:3152
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:3908
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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:464 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2296
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:3800
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:3640 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:3856
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\README.txt3⤵
- Opens file in notepad (likely ransom note)
PID:4888
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3476
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2480
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1896
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:1736
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
120KB
MD55d4c5f3457c4487fe26df768ed8f3d2b
SHA1f5f3df7d11e06dc158ac8183a8bde5895f8ea251
SHA25619c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32
SHA512793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a
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Filesize
366B
MD5a9739643e50a5d9ca0f162feb7846dd5
SHA1d10c5feedd35fd2a24cd1266014ae8adaad22fd3
SHA256e611bd6ae4702f7496dda7ae78a5df097d1e6858c7fa38b3b9b7140379f7d51c
SHA512cb5e3943ccce39f10a899a4900952b702601840a2e6dd8e385ebed1e4e7b041f8440dd7dde229c5d28cf82f380b17f498a3e6cb8426d984b71a4115de3df9552