Analysis
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max time kernel
140s -
max time network
150s -
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 22:53
Behavioral task
behavioral1
Sample
PrivateChat V2.0.exe
Resource
win7-20240221-en
General
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Target
PrivateChat V2.0.exe
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Size
87KB
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MD5
4e0daa19b125c8e2703e9de440b1340b
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SHA1
8dd7592a40384093ab296ea4a0ae14102441b884
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SHA256
2dcc9c629488710a424dba2eefcfbecbf1edcc092a8387be7929db59f9692e71
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SHA512
8bf90f3d89e0592b5e5f1f6b1d5a362b1db84612eb8f737bec7e17c25e8e9748dd0293e40addea8f77c4f49e7e3a1e345ff78e1ee150dc29bfb643bbdb78e040
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SSDEEP
1536:SPvg251EzYY2MkcqhQP6xY9G+beYZFy+U0/A1OG36zvO5d2LueRISbfX:SPvg2szr5kcqhgx8+be+yTL+OjOusr
Malware Config
Extracted
xworm
employees-resolution.gl.at.ply.gg:35582
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install_file
USB.exe
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/files/0x000800000002322d-43.dat family_chaos behavioral2/memory/4080-50-0x0000000000160000-0x0000000000184000-memory.dmp family_chaos -
Detect Xworm Payload 1 IoCs
resource yara_rule behavioral2/memory/3420-0-0x0000000000E60000-0x0000000000E7C000-memory.dmp family_xworm -
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 3736 bcdedit.exe 1164 bcdedit.exe -
pid Process 4428 wbadmin.exe -
Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation PrivateChat V2.0.exe Key value queried \REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\International\Geo\Nation cujwyn.exe Key value queried \REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\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 2 IoCs
pid Process 4080 cujwyn.exe 3776 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\Camera Roll\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\Administrative Tools\desktop.ini PrivateChat.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3270530367-132075249-2153716227-1000\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\Pictures\Saved Pictures\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\AccountPictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Music\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Music\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\Favorites\Links\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\Desktop\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\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\Desktop\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Saved Games\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\Start Menu\Programs\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Videos\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\Internet Explorer\Quick Launch\User Pinned\TaskBar\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\Documents\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Downloads\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\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 -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\eo6ucogoa.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 408 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3270530367-132075249-2153716227-1000_Classes\Local Settings PrivateChat.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 4364 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 3776 PrivateChat.exe -
Suspicious behavior: EnumeratesProcesses 53 IoCs
pid Process 3476 powershell.exe 3476 powershell.exe 1936 powershell.exe 1936 powershell.exe 3420 PrivateChat V2.0.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 4080 cujwyn.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe 3776 PrivateChat.exe -
Suspicious use of AdjustPrivilegeToken 54 IoCs
description pid Process Token: SeDebugPrivilege 3420 PrivateChat V2.0.exe Token: SeDebugPrivilege 3476 powershell.exe Token: SeDebugPrivilege 1936 powershell.exe Token: SeDebugPrivilege 3420 PrivateChat V2.0.exe Token: SeDebugPrivilege 4080 cujwyn.exe Token: SeDebugPrivilege 3776 PrivateChat.exe Token: SeBackupPrivilege 2964 vssvc.exe Token: SeRestorePrivilege 2964 vssvc.exe Token: SeAuditPrivilege 2964 vssvc.exe Token: SeIncreaseQuotaPrivilege 3228 WMIC.exe Token: SeSecurityPrivilege 3228 WMIC.exe Token: SeTakeOwnershipPrivilege 3228 WMIC.exe Token: SeLoadDriverPrivilege 3228 WMIC.exe Token: SeSystemProfilePrivilege 3228 WMIC.exe Token: SeSystemtimePrivilege 3228 WMIC.exe Token: SeProfSingleProcessPrivilege 3228 WMIC.exe Token: SeIncBasePriorityPrivilege 3228 WMIC.exe Token: SeCreatePagefilePrivilege 3228 WMIC.exe Token: SeBackupPrivilege 3228 WMIC.exe Token: SeRestorePrivilege 3228 WMIC.exe Token: SeShutdownPrivilege 3228 WMIC.exe Token: SeDebugPrivilege 3228 WMIC.exe Token: SeSystemEnvironmentPrivilege 3228 WMIC.exe Token: SeRemoteShutdownPrivilege 3228 WMIC.exe Token: SeUndockPrivilege 3228 WMIC.exe Token: SeManageVolumePrivilege 3228 WMIC.exe Token: 33 3228 WMIC.exe Token: 34 3228 WMIC.exe Token: 35 3228 WMIC.exe Token: 36 3228 WMIC.exe Token: SeIncreaseQuotaPrivilege 3228 WMIC.exe Token: SeSecurityPrivilege 3228 WMIC.exe Token: SeTakeOwnershipPrivilege 3228 WMIC.exe Token: SeLoadDriverPrivilege 3228 WMIC.exe Token: SeSystemProfilePrivilege 3228 WMIC.exe Token: SeSystemtimePrivilege 3228 WMIC.exe Token: SeProfSingleProcessPrivilege 3228 WMIC.exe Token: SeIncBasePriorityPrivilege 3228 WMIC.exe Token: SeCreatePagefilePrivilege 3228 WMIC.exe Token: SeBackupPrivilege 3228 WMIC.exe Token: SeRestorePrivilege 3228 WMIC.exe Token: SeShutdownPrivilege 3228 WMIC.exe Token: SeDebugPrivilege 3228 WMIC.exe Token: SeSystemEnvironmentPrivilege 3228 WMIC.exe Token: SeRemoteShutdownPrivilege 3228 WMIC.exe Token: SeUndockPrivilege 3228 WMIC.exe Token: SeManageVolumePrivilege 3228 WMIC.exe Token: 33 3228 WMIC.exe Token: 34 3228 WMIC.exe Token: 35 3228 WMIC.exe Token: 36 3228 WMIC.exe Token: SeBackupPrivilege 4928 wbengine.exe Token: SeRestorePrivilege 4928 wbengine.exe Token: SeSecurityPrivilege 4928 wbengine.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 3420 PrivateChat V2.0.exe -
Suspicious use of WriteProcessMemory 26 IoCs
description pid Process procid_target PID 3420 wrote to memory of 3476 3420 PrivateChat V2.0.exe 95 PID 3420 wrote to memory of 3476 3420 PrivateChat V2.0.exe 95 PID 3420 wrote to memory of 1936 3420 PrivateChat V2.0.exe 97 PID 3420 wrote to memory of 1936 3420 PrivateChat V2.0.exe 97 PID 3420 wrote to memory of 4080 3420 PrivateChat V2.0.exe 111 PID 3420 wrote to memory of 4080 3420 PrivateChat V2.0.exe 111 PID 4080 wrote to memory of 3776 4080 cujwyn.exe 112 PID 4080 wrote to memory of 3776 4080 cujwyn.exe 112 PID 3776 wrote to memory of 3744 3776 PrivateChat.exe 114 PID 3776 wrote to memory of 3744 3776 PrivateChat.exe 114 PID 3744 wrote to memory of 408 3744 cmd.exe 116 PID 3744 wrote to memory of 408 3744 cmd.exe 116 PID 3744 wrote to memory of 3228 3744 cmd.exe 119 PID 3744 wrote to memory of 3228 3744 cmd.exe 119 PID 3776 wrote to memory of 636 3776 PrivateChat.exe 120 PID 3776 wrote to memory of 636 3776 PrivateChat.exe 120 PID 636 wrote to memory of 3736 636 cmd.exe 122 PID 636 wrote to memory of 3736 636 cmd.exe 122 PID 636 wrote to memory of 1164 636 cmd.exe 123 PID 636 wrote to memory of 1164 636 cmd.exe 123 PID 3776 wrote to memory of 5084 3776 PrivateChat.exe 124 PID 3776 wrote to memory of 5084 3776 PrivateChat.exe 124 PID 5084 wrote to memory of 4428 5084 cmd.exe 126 PID 5084 wrote to memory of 4428 5084 cmd.exe 126 PID 3776 wrote to memory of 4364 3776 PrivateChat.exe 130 PID 3776 wrote to memory of 4364 3776 PrivateChat.exe 130 -
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 V2.0.exe"C:\Users\Admin\AppData\Local\Temp\PrivateChat V2.0.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3420 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\PrivateChat V2.0.exe'2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3476
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'PrivateChat V2.0.exe'2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1936
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C:\Users\Admin\AppData\Local\Temp\cujwyn.exe"C:\Users\Admin\AppData\Local\Temp\cujwyn.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4080 -
C:\Users\Admin\AppData\Roaming\PrivateChat.exe"C:\Users\Admin\AppData\Roaming\PrivateChat.exe"3⤵
- 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:3776 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete4⤵
- Suspicious use of WriteProcessMemory
PID:3744 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet5⤵
- Interacts with shadow copies
PID:408
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete5⤵
- Suspicious use of AdjustPrivilegeToken
PID:3228
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no4⤵
- Suspicious use of WriteProcessMemory
PID:636 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures5⤵
- Modifies boot configuration data using bcdedit
PID:3736
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no5⤵
- Modifies boot configuration data using bcdedit
PID:1164
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet4⤵
- Suspicious use of WriteProcessMemory
PID:5084 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet5⤵
- Deletes backup catalog
PID:4428
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\README.txt4⤵
- Opens file in notepad (likely ransom note)
PID:4364
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2964
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4928
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:3076
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:3992
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
2KB
MD5d85ba6ff808d9e5444a4b369f5bc2730
SHA131aa9d96590fff6981b315e0b391b575e4c0804a
SHA25684739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA5128c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
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Filesize
944B
MD5d28a889fd956d5cb3accfbaf1143eb6f
SHA1157ba54b365341f8ff06707d996b3635da8446f7
SHA25621e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45
SHA5120b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
120KB
MD55d4c5f3457c4487fe26df768ed8f3d2b
SHA1f5f3df7d11e06dc158ac8183a8bde5895f8ea251
SHA25619c393a4787d325984d850d8f02db1f302819b808952f72c332251d5d95f7c32
SHA512793b8917ad068b77bcc7d771a28069ac432cfb441438e1a1f159fe94cbb2aa550fb2cc47d7354e30275ce2df402774902c987ad9b9be900f3748281f13a30e9a
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Filesize
366B
MD5a9739643e50a5d9ca0f162feb7846dd5
SHA1d10c5feedd35fd2a24cd1266014ae8adaad22fd3
SHA256e611bd6ae4702f7496dda7ae78a5df097d1e6858c7fa38b3b9b7140379f7d51c
SHA512cb5e3943ccce39f10a899a4900952b702601840a2e6dd8e385ebed1e4e7b041f8440dd7dde229c5d28cf82f380b17f498a3e6cb8426d984b71a4115de3df9552