Analysis
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max time kernel
142s -
max time network
151s -
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 20:48
Behavioral task
behavioral1
Sample
PrivateChat.exe
Resource
win7-20231129-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
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/3840-0-0x0000000000C50000-0x0000000000C74000-memory.dmp family_chaos behavioral2/files/0x000c0000000004fe-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 272 bcdedit.exe 1840 bcdedit.exe -
pid Process 2288 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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation PrivateChat.exe Key value queried \REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\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 4900 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\Programs\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\Pictures\Saved Pictures\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Downloads\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\Maintenance\Desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\Pictures\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 File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3808065738-1666277613-1125846146-1000\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\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\Accessibility\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Links\desktop.ini PrivateChat.exe File opened for modification C:\Users\Public\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\Documents\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\OneDrive\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\Recent\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Desktop\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\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 C:\Users\Admin\Contacts\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\AccountPictures\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\Videos\desktop.ini PrivateChat.exe File opened for modification C:\Users\Admin\Music\desktop.ini PrivateChat.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\5vm5rozjc.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 3360 vssadmin.exe -
Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000_Classes\Local Settings OpenWith.exe Key created \REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000_Classes\Local Settings PrivateChat.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 5200 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 4900 PrivateChat.exe -
Suspicious behavior: EnumeratesProcesses 52 IoCs
pid Process 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 3840 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe 4900 PrivateChat.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 3840 PrivateChat.exe Token: SeDebugPrivilege 4900 PrivateChat.exe Token: SeBackupPrivilege 4948 vssvc.exe Token: SeRestorePrivilege 4948 vssvc.exe Token: SeAuditPrivilege 4948 vssvc.exe Token: SeIncreaseQuotaPrivilege 4388 WMIC.exe Token: SeSecurityPrivilege 4388 WMIC.exe Token: SeTakeOwnershipPrivilege 4388 WMIC.exe Token: SeLoadDriverPrivilege 4388 WMIC.exe Token: SeSystemProfilePrivilege 4388 WMIC.exe Token: SeSystemtimePrivilege 4388 WMIC.exe Token: SeProfSingleProcessPrivilege 4388 WMIC.exe Token: SeIncBasePriorityPrivilege 4388 WMIC.exe Token: SeCreatePagefilePrivilege 4388 WMIC.exe Token: SeBackupPrivilege 4388 WMIC.exe Token: SeRestorePrivilege 4388 WMIC.exe Token: SeShutdownPrivilege 4388 WMIC.exe Token: SeDebugPrivilege 4388 WMIC.exe Token: SeSystemEnvironmentPrivilege 4388 WMIC.exe Token: SeRemoteShutdownPrivilege 4388 WMIC.exe Token: SeUndockPrivilege 4388 WMIC.exe Token: SeManageVolumePrivilege 4388 WMIC.exe Token: 33 4388 WMIC.exe Token: 34 4388 WMIC.exe Token: 35 4388 WMIC.exe Token: 36 4388 WMIC.exe Token: SeIncreaseQuotaPrivilege 4388 WMIC.exe Token: SeSecurityPrivilege 4388 WMIC.exe Token: SeTakeOwnershipPrivilege 4388 WMIC.exe Token: SeLoadDriverPrivilege 4388 WMIC.exe Token: SeSystemProfilePrivilege 4388 WMIC.exe Token: SeSystemtimePrivilege 4388 WMIC.exe Token: SeProfSingleProcessPrivilege 4388 WMIC.exe Token: SeIncBasePriorityPrivilege 4388 WMIC.exe Token: SeCreatePagefilePrivilege 4388 WMIC.exe Token: SeBackupPrivilege 4388 WMIC.exe Token: SeRestorePrivilege 4388 WMIC.exe Token: SeShutdownPrivilege 4388 WMIC.exe Token: SeDebugPrivilege 4388 WMIC.exe Token: SeSystemEnvironmentPrivilege 4388 WMIC.exe Token: SeRemoteShutdownPrivilege 4388 WMIC.exe Token: SeUndockPrivilege 4388 WMIC.exe Token: SeManageVolumePrivilege 4388 WMIC.exe Token: 33 4388 WMIC.exe Token: 34 4388 WMIC.exe Token: 35 4388 WMIC.exe Token: 36 4388 WMIC.exe Token: SeBackupPrivilege 4160 wbengine.exe Token: SeRestorePrivilege 4160 wbengine.exe Token: SeSecurityPrivilege 4160 wbengine.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 268 OpenWith.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 3840 wrote to memory of 4900 3840 PrivateChat.exe 101 PID 3840 wrote to memory of 4900 3840 PrivateChat.exe 101 PID 4900 wrote to memory of 3392 4900 PrivateChat.exe 112 PID 4900 wrote to memory of 3392 4900 PrivateChat.exe 112 PID 3392 wrote to memory of 3360 3392 cmd.exe 114 PID 3392 wrote to memory of 3360 3392 cmd.exe 114 PID 3392 wrote to memory of 4388 3392 cmd.exe 117 PID 3392 wrote to memory of 4388 3392 cmd.exe 117 PID 4900 wrote to memory of 4884 4900 PrivateChat.exe 118 PID 4900 wrote to memory of 4884 4900 PrivateChat.exe 118 PID 4884 wrote to memory of 272 4884 cmd.exe 121 PID 4884 wrote to memory of 272 4884 cmd.exe 121 PID 4884 wrote to memory of 1840 4884 cmd.exe 122 PID 4884 wrote to memory of 1840 4884 cmd.exe 122 PID 4900 wrote to memory of 376 4900 PrivateChat.exe 123 PID 4900 wrote to memory of 376 4900 PrivateChat.exe 123 PID 376 wrote to memory of 2288 376 cmd.exe 125 PID 376 wrote to memory of 2288 376 cmd.exe 125 PID 4900 wrote to memory of 5200 4900 PrivateChat.exe 129 PID 4900 wrote to memory of 5200 4900 PrivateChat.exe 129 -
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:3840 -
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:4900 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:3392 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:3360
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:4388
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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:4884 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:272
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1840
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:376 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2288
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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:5200
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4948
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C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:268
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4160
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1128
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:3404
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4832 --field-trial-handle=3060,i,1774866140584649235,8085848018931772189,262144 --variations-seed-version /prefetch:81⤵PID:5368
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
226B
MD528d7fcc2b910da5e67ebb99451a5f598
SHA1a5bf77a53eda1208f4f37d09d82da0b9915a6747
SHA2562391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c
SHA5122d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6
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Filesize
122KB
MD5a4960213baa07bad3f5762d38e68449b
SHA1ea2db256e305d0a6f69dafd2e44047d3ad7cf553
SHA2562ca6754227d58abaedd803ab2b4903a5d6da9967da353446dd676822f9135fe2
SHA512b56cbe5122392d83ce30ec3c06b5b871dae46ad5b30a6451621d4097e7a966e6d0028aafb9c98acc13c12ed115cb7c684c2cc0f30b04560fe5b0c746b5b836db
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Filesize
510B
MD508dd3f6950280cf6839b09c5a090f70a
SHA113d8c41b481b7b2cc885c06a83e979d57fd470b0
SHA2563a58a8f73b2c6c44f573d4538b990843840514ee0c76ff3ea00dd152d2c95c36
SHA512ca5fa6803741d00f32712241109e46bc311b29d2adb2bd2a4f2f2829d86a10d583bc0bc6fdc96f6061da435c5b4304802867c31bd60d59449e8b79df50757ebe