Analysis
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max time kernel
90s -
max time network
98s -
platform
windows11-21h2_x64 -
resource
win11-20250313-en -
resource tags
arch:x64arch:x86image:win11-20250313-enlocale:en-usos:windows11-21h2-x64system -
submitted
23/03/2025, 21:31
Behavioral task
behavioral1
Sample
FreeVbucks.exe
Resource
win11-20250313-en
Errors
General
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Target
FreeVbucks.exe
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Size
2.7MB
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MD5
a988089a040efd226b8c801f1d527d17
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SHA1
2cf4a52f0d2313dd7a7619bbc61681aecdcb2610
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SHA256
40a4b00e9904e973795b36d57e35da10f2543dfc55a54ac25a88da5c53e55a84
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SHA512
e591aafc86c3c370be73347441bd576c995538f8d19fcadc3e25f9c36193d3be08fbb5a65134d84168b203c87f5d533a96442f481f8c14741f36d4ed9a8277e4
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SSDEEP
24576:ivC7suY2Mlva2bpmGB3rgkTsZGvSKgkatV9hLG37WDd/OKAVlAL4lGhty:iibM0NkA8leL
Malware Config
Extracted
C:\Users\Admin\Documents\read_it.txt
chaos
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 2 IoCs
resource yara_rule behavioral1/memory/628-1-0x00000000009B0000-0x0000000000C76000-memory.dmp family_chaos behavioral1/files/0x001c00000002b08f-7.dat family_chaos -
Chaos family
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Deletes shadow copies 3 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 3872 bcdedit.exe 2084 bcdedit.exe -
pid Process 1620 wbadmin.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt svchost.exe -
Executes dropped EXE 1 IoCs
pid Process 3096 svchost.exe -
Reads user/profile data of web browsers 3 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\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-1136229799-3442283115-138161576-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1136229799-3442283115-138161576-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\l3uq6mdfp.jpg" svchost.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_WDC&PROD_WDS100T2B0A\4&215468A5&0&000000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName vds.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_QEMU&PROD_QEMU_DVD-ROM\4&215468A5&0&010000 vds.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName vds.exe -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 2372 vssadmin.exe -
Modifies data under HKEY_USERS 15 IoCs
description ioc Process Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = 99ebff004cc2ff000091f8000078d4000067c000003e9200001a6800f7630c00 LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292114432" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4290799360" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "98" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292114432" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365268" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365268" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" LogonUI.exe -
Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-1136229799-3442283115-138161576-1000_Classes\Local Settings svchost.exe Key created \REGISTRY\USER\S-1-5-21-1136229799-3442283115-138161576-1000_Classes\Local Settings OpenWith.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2996 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 3096 svchost.exe -
Suspicious behavior: EnumeratesProcesses 41 IoCs
pid Process 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 628 FreeVbucks.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe 3096 svchost.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 628 FreeVbucks.exe Token: SeDebugPrivilege 3096 svchost.exe Token: SeBackupPrivilege 2476 vssvc.exe Token: SeRestorePrivilege 2476 vssvc.exe Token: SeAuditPrivilege 2476 vssvc.exe Token: SeIncreaseQuotaPrivilege 2332 WMIC.exe Token: SeSecurityPrivilege 2332 WMIC.exe Token: SeTakeOwnershipPrivilege 2332 WMIC.exe Token: SeLoadDriverPrivilege 2332 WMIC.exe Token: SeSystemProfilePrivilege 2332 WMIC.exe Token: SeSystemtimePrivilege 2332 WMIC.exe Token: SeProfSingleProcessPrivilege 2332 WMIC.exe Token: SeIncBasePriorityPrivilege 2332 WMIC.exe Token: SeCreatePagefilePrivilege 2332 WMIC.exe Token: SeBackupPrivilege 2332 WMIC.exe Token: SeRestorePrivilege 2332 WMIC.exe Token: SeShutdownPrivilege 2332 WMIC.exe Token: SeDebugPrivilege 2332 WMIC.exe Token: SeSystemEnvironmentPrivilege 2332 WMIC.exe Token: SeRemoteShutdownPrivilege 2332 WMIC.exe Token: SeUndockPrivilege 2332 WMIC.exe Token: SeManageVolumePrivilege 2332 WMIC.exe Token: 33 2332 WMIC.exe Token: 34 2332 WMIC.exe Token: 35 2332 WMIC.exe Token: 36 2332 WMIC.exe Token: SeIncreaseQuotaPrivilege 2332 WMIC.exe Token: SeSecurityPrivilege 2332 WMIC.exe Token: SeTakeOwnershipPrivilege 2332 WMIC.exe Token: SeLoadDriverPrivilege 2332 WMIC.exe Token: SeSystemProfilePrivilege 2332 WMIC.exe Token: SeSystemtimePrivilege 2332 WMIC.exe Token: SeProfSingleProcessPrivilege 2332 WMIC.exe Token: SeIncBasePriorityPrivilege 2332 WMIC.exe Token: SeCreatePagefilePrivilege 2332 WMIC.exe Token: SeBackupPrivilege 2332 WMIC.exe Token: SeRestorePrivilege 2332 WMIC.exe Token: SeShutdownPrivilege 2332 WMIC.exe Token: SeDebugPrivilege 2332 WMIC.exe Token: SeSystemEnvironmentPrivilege 2332 WMIC.exe Token: SeRemoteShutdownPrivilege 2332 WMIC.exe Token: SeUndockPrivilege 2332 WMIC.exe Token: SeManageVolumePrivilege 2332 WMIC.exe Token: 33 2332 WMIC.exe Token: 34 2332 WMIC.exe Token: 35 2332 WMIC.exe Token: 36 2332 WMIC.exe Token: SeBackupPrivilege 480 wbengine.exe Token: SeRestorePrivilege 480 wbengine.exe Token: SeSecurityPrivilege 480 wbengine.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 3928 OpenWith.exe 1300 LogonUI.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 628 wrote to memory of 3096 628 FreeVbucks.exe 81 PID 628 wrote to memory of 3096 628 FreeVbucks.exe 81 PID 3096 wrote to memory of 4236 3096 svchost.exe 83 PID 3096 wrote to memory of 4236 3096 svchost.exe 83 PID 4236 wrote to memory of 2372 4236 cmd.exe 85 PID 4236 wrote to memory of 2372 4236 cmd.exe 85 PID 4236 wrote to memory of 2332 4236 cmd.exe 88 PID 4236 wrote to memory of 2332 4236 cmd.exe 88 PID 3096 wrote to memory of 2464 3096 svchost.exe 90 PID 3096 wrote to memory of 2464 3096 svchost.exe 90 PID 2464 wrote to memory of 3872 2464 cmd.exe 92 PID 2464 wrote to memory of 3872 2464 cmd.exe 92 PID 2464 wrote to memory of 2084 2464 cmd.exe 93 PID 2464 wrote to memory of 2084 2464 cmd.exe 93 PID 3096 wrote to memory of 1184 3096 svchost.exe 94 PID 3096 wrote to memory of 1184 3096 svchost.exe 94 PID 1184 wrote to memory of 1620 1184 cmd.exe 96 PID 1184 wrote to memory of 1620 1184 cmd.exe 96 PID 3096 wrote to memory of 2996 3096 svchost.exe 100 PID 3096 wrote to memory of 2996 3096 svchost.exe 100 -
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\FreeVbucks.exe"C:\Users\Admin\AppData\Local\Temp\FreeVbucks.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:628 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"2⤵
- 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:3096 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:4236 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2372
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2332
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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:2464 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:3872
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2084
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:1184 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1620
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt3⤵
- Opens file in notepad (likely ransom note)
PID:2996
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2476
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:480
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:696
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:4836
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C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:3928
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa3a33855 /state1:0x41c64e6d1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:1300
Network
MITRE ATT&CK Enterprise v15
Defense Evasion
Direct Volume Access
1Indicator Removal
3File Deletion
3Modify Registry
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
2.7MB
MD5a988089a040efd226b8c801f1d527d17
SHA12cf4a52f0d2313dd7a7619bbc61681aecdcb2610
SHA25640a4b00e9904e973795b36d57e35da10f2543dfc55a54ac25a88da5c53e55a84
SHA512e591aafc86c3c370be73347441bd576c995538f8d19fcadc3e25f9c36193d3be08fbb5a65134d84168b203c87f5d533a96442f481f8c14741f36d4ed9a8277e4
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740