Analysis
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max time kernel
147s -
max time network
160s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
22-03-2024 21:20
Behavioral task
behavioral1
Sample
PrivateChat.exe
Resource
win7-20240221-en
windows7-x64
19 signatures
150 seconds
Behavioral task
behavioral2
Sample
PrivateChat.exe
Resource
win10v2004-20240226-en
windows10-2004-x64
23 signatures
150 seconds
General
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Target
PrivateChat.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/4956-0-0x0000000000D60000-0x0000000000D84000-memory.dmp family_chaos behavioral2/files/0x000700000002321d-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 3148 bcdedit.exe 544 bcdedit.exe -
pid Process 4848 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-1-5-21-609813121-2907144057-1731107329-1000\Control Panel\International\Geo\Nation PrivateChat.exe Key value queried \REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\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\README.txt PrivateChat.exe 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 -
Executes dropped EXE 1 IoCs
pid Process 4636 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\Contacts\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Documents\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Pictures\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\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\Favorites\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\Searches\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\Libraries\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\Desktop\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\OneDrive\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\Accessories\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\Favorites\Links\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\System Tools\Desktop.ini PrivateChat.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-609813121-2907144057-1731107329-1000\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\Windows\Recent\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\Public\Videos\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\Public\Music\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Desktop\desktop.ini PrivateChat.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\fgquiqbqy.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 value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_DADY&Prod_DADY_DVD-ROM\4&215468a5&0&010000\FriendlyName vds.exe 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 -
Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 1452 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000_Classes\Local Settings PrivateChat.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 4712 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 4636 PrivateChat.exe -
Suspicious behavior: EnumeratesProcesses 54 IoCs
pid Process 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4956 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe 4636 PrivateChat.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 4956 PrivateChat.exe Token: SeDebugPrivilege 4636 PrivateChat.exe Token: SeBackupPrivilege 752 vssvc.exe Token: SeRestorePrivilege 752 vssvc.exe Token: SeAuditPrivilege 752 vssvc.exe Token: SeIncreaseQuotaPrivilege 4284 WMIC.exe Token: SeSecurityPrivilege 4284 WMIC.exe Token: SeTakeOwnershipPrivilege 4284 WMIC.exe Token: SeLoadDriverPrivilege 4284 WMIC.exe Token: SeSystemProfilePrivilege 4284 WMIC.exe Token: SeSystemtimePrivilege 4284 WMIC.exe Token: SeProfSingleProcessPrivilege 4284 WMIC.exe Token: SeIncBasePriorityPrivilege 4284 WMIC.exe Token: SeCreatePagefilePrivilege 4284 WMIC.exe Token: SeBackupPrivilege 4284 WMIC.exe Token: SeRestorePrivilege 4284 WMIC.exe Token: SeShutdownPrivilege 4284 WMIC.exe Token: SeDebugPrivilege 4284 WMIC.exe Token: SeSystemEnvironmentPrivilege 4284 WMIC.exe Token: SeRemoteShutdownPrivilege 4284 WMIC.exe Token: SeUndockPrivilege 4284 WMIC.exe Token: SeManageVolumePrivilege 4284 WMIC.exe Token: 33 4284 WMIC.exe Token: 34 4284 WMIC.exe Token: 35 4284 WMIC.exe Token: 36 4284 WMIC.exe Token: SeIncreaseQuotaPrivilege 4284 WMIC.exe Token: SeSecurityPrivilege 4284 WMIC.exe Token: SeTakeOwnershipPrivilege 4284 WMIC.exe Token: SeLoadDriverPrivilege 4284 WMIC.exe Token: SeSystemProfilePrivilege 4284 WMIC.exe Token: SeSystemtimePrivilege 4284 WMIC.exe Token: SeProfSingleProcessPrivilege 4284 WMIC.exe Token: SeIncBasePriorityPrivilege 4284 WMIC.exe Token: SeCreatePagefilePrivilege 4284 WMIC.exe Token: SeBackupPrivilege 4284 WMIC.exe Token: SeRestorePrivilege 4284 WMIC.exe Token: SeShutdownPrivilege 4284 WMIC.exe Token: SeDebugPrivilege 4284 WMIC.exe Token: SeSystemEnvironmentPrivilege 4284 WMIC.exe Token: SeRemoteShutdownPrivilege 4284 WMIC.exe Token: SeUndockPrivilege 4284 WMIC.exe Token: SeManageVolumePrivilege 4284 WMIC.exe Token: 33 4284 WMIC.exe Token: 34 4284 WMIC.exe Token: 35 4284 WMIC.exe Token: 36 4284 WMIC.exe Token: SeBackupPrivilege 3824 wbengine.exe Token: SeRestorePrivilege 3824 wbengine.exe Token: SeSecurityPrivilege 3824 wbengine.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 4712 NOTEPAD.EXE -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 4956 wrote to memory of 4636 4956 PrivateChat.exe 90 PID 4956 wrote to memory of 4636 4956 PrivateChat.exe 90 PID 4636 wrote to memory of 1616 4636 PrivateChat.exe 100 PID 4636 wrote to memory of 1616 4636 PrivateChat.exe 100 PID 1616 wrote to memory of 1452 1616 cmd.exe 102 PID 1616 wrote to memory of 1452 1616 cmd.exe 102 PID 1616 wrote to memory of 4284 1616 cmd.exe 105 PID 1616 wrote to memory of 4284 1616 cmd.exe 105 PID 4636 wrote to memory of 844 4636 PrivateChat.exe 107 PID 4636 wrote to memory of 844 4636 PrivateChat.exe 107 PID 844 wrote to memory of 3148 844 cmd.exe 109 PID 844 wrote to memory of 3148 844 cmd.exe 109 PID 844 wrote to memory of 544 844 cmd.exe 110 PID 844 wrote to memory of 544 844 cmd.exe 110 PID 4636 wrote to memory of 2700 4636 PrivateChat.exe 112 PID 4636 wrote to memory of 2700 4636 PrivateChat.exe 112 PID 2700 wrote to memory of 4848 2700 cmd.exe 114 PID 2700 wrote to memory of 4848 2700 cmd.exe 114 PID 4636 wrote to memory of 4712 4636 PrivateChat.exe 118 PID 4636 wrote to memory of 4712 4636 PrivateChat.exe 118 -
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\PrivateChat.exe"C:\Users\Admin\AppData\Local\Temp\PrivateChat.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4956 -
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:4636 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1616 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1452
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:4284
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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:844 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:3148
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:544
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2700 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:4848
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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)
- Suspicious use of FindShellTrayWindow
PID:4712
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:752
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3824
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:4268
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:2080
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
226B
MD528d7fcc2b910da5e67ebb99451a5f598
SHA1a5bf77a53eda1208f4f37d09d82da0b9915a6747
SHA2562391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c
SHA5122d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6
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Filesize
120KB
MD55d4c5f3457c4487fe26df768ed8f3d2b
SHA1f5f3df7d11e06dc158ac8183a8bde5895f8ea251
SHA25619c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32
SHA512793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a
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Filesize
366B
MD5a9739643e50a5d9ca0f162feb7846dd5
SHA1d10c5feedd35fd2a24cd1266014ae8adaad22fd3
SHA256e611bd6ae4702f7496dda7ae78a5df097d1e6858c7fa38b3b9b7140379f7d51c
SHA512cb5e3943ccce39f10a899a4900952b702601840a2e6dd8e385ebed1e4e7b041f8440dd7dde229c5d28cf82f380b17f498a3e6cb8426d984b71a4115de3df9552