Analysis
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max time kernel
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max time network
138s -
platform
windows10-2004_x64 -
resource
win10v2004-20250314-en -
resource tags
arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system -
submitted
23/03/2025, 21:28
Behavioral task
behavioral1
Sample
FreeVbucks.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
FreeVbucks.exe
Resource
win10v2004-20250314-en
General
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Target
FreeVbucks.exe
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Size
2.7MB
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MD5
afba56cb6fee3660b751b98418c1fdf1
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SHA1
24364e0e691df3b6e7ebd0e142993fcd6b063984
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SHA256
df86bc46fdd921147c26c94a4cc054efa01bf2fa837756ffc0139171c8a388d8
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SHA512
dd138767c127af7e92a696ceccc3b304c99a52392c66d6e8af41f68be8165af55c99ccc62546afbec2da212f207e9b0a66968e73eaab4d3f2821172ff1d3a99b
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SSDEEP
24576:QC7suY2Mlva2bpmGB3rgkTsZGvSKgkatV9hLG37WDd/OKAVlAL4lGhtl:lbM0NkA8leL
Malware Config
Extracted
C:\Users\Admin\Desktop\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 behavioral2/memory/1308-1-0x0000000000F60000-0x0000000001226000-memory.dmp family_chaos behavioral2/files/0x000400000001e602-7.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 4804 bcdedit.exe 4556 bcdedit.exe -
pid Process 3772 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-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation FreeVbucks.exe Key value queried \REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation svchost.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt svchost.exe 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 -
Executes dropped EXE 1 IoCs
pid Process 4048 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\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\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\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\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\Start Menu\Programs\Accessibility\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-869607583-2483572573-2297019986-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\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\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\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\Documents\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\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 C:\Users\Public\Videos\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\Contacts\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\OneDrive\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\k262kon3m.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\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 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 -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 3436 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000_Classes\Local Settings svchost.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 764 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 4048 svchost.exe -
Suspicious behavior: EnumeratesProcesses 56 IoCs
pid Process 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 1308 FreeVbucks.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe 4048 svchost.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 1308 FreeVbucks.exe Token: SeDebugPrivilege 4048 svchost.exe Token: SeBackupPrivilege 1816 vssvc.exe Token: SeRestorePrivilege 1816 vssvc.exe Token: SeAuditPrivilege 1816 vssvc.exe Token: SeIncreaseQuotaPrivilege 4468 WMIC.exe Token: SeSecurityPrivilege 4468 WMIC.exe Token: SeTakeOwnershipPrivilege 4468 WMIC.exe Token: SeLoadDriverPrivilege 4468 WMIC.exe Token: SeSystemProfilePrivilege 4468 WMIC.exe Token: SeSystemtimePrivilege 4468 WMIC.exe Token: SeProfSingleProcessPrivilege 4468 WMIC.exe Token: SeIncBasePriorityPrivilege 4468 WMIC.exe Token: SeCreatePagefilePrivilege 4468 WMIC.exe Token: SeBackupPrivilege 4468 WMIC.exe Token: SeRestorePrivilege 4468 WMIC.exe Token: SeShutdownPrivilege 4468 WMIC.exe Token: SeDebugPrivilege 4468 WMIC.exe Token: SeSystemEnvironmentPrivilege 4468 WMIC.exe Token: SeRemoteShutdownPrivilege 4468 WMIC.exe Token: SeUndockPrivilege 4468 WMIC.exe Token: SeManageVolumePrivilege 4468 WMIC.exe Token: 33 4468 WMIC.exe Token: 34 4468 WMIC.exe Token: 35 4468 WMIC.exe Token: 36 4468 WMIC.exe Token: SeIncreaseQuotaPrivilege 4468 WMIC.exe Token: SeSecurityPrivilege 4468 WMIC.exe Token: SeTakeOwnershipPrivilege 4468 WMIC.exe Token: SeLoadDriverPrivilege 4468 WMIC.exe Token: SeSystemProfilePrivilege 4468 WMIC.exe Token: SeSystemtimePrivilege 4468 WMIC.exe Token: SeProfSingleProcessPrivilege 4468 WMIC.exe Token: SeIncBasePriorityPrivilege 4468 WMIC.exe Token: SeCreatePagefilePrivilege 4468 WMIC.exe Token: SeBackupPrivilege 4468 WMIC.exe Token: SeRestorePrivilege 4468 WMIC.exe Token: SeShutdownPrivilege 4468 WMIC.exe Token: SeDebugPrivilege 4468 WMIC.exe Token: SeSystemEnvironmentPrivilege 4468 WMIC.exe Token: SeRemoteShutdownPrivilege 4468 WMIC.exe Token: SeUndockPrivilege 4468 WMIC.exe Token: SeManageVolumePrivilege 4468 WMIC.exe Token: 33 4468 WMIC.exe Token: 34 4468 WMIC.exe Token: 35 4468 WMIC.exe Token: 36 4468 WMIC.exe Token: SeBackupPrivilege 3376 wbengine.exe Token: SeRestorePrivilege 3376 wbengine.exe Token: SeSecurityPrivilege 3376 wbengine.exe -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 1308 wrote to memory of 4048 1308 FreeVbucks.exe 104 PID 1308 wrote to memory of 4048 1308 FreeVbucks.exe 104 PID 4048 wrote to memory of 4040 4048 svchost.exe 105 PID 4048 wrote to memory of 4040 4048 svchost.exe 105 PID 4040 wrote to memory of 3436 4040 cmd.exe 107 PID 4040 wrote to memory of 3436 4040 cmd.exe 107 PID 4040 wrote to memory of 4468 4040 cmd.exe 110 PID 4040 wrote to memory of 4468 4040 cmd.exe 110 PID 4048 wrote to memory of 4440 4048 svchost.exe 111 PID 4048 wrote to memory of 4440 4048 svchost.exe 111 PID 4440 wrote to memory of 4804 4440 cmd.exe 113 PID 4440 wrote to memory of 4804 4440 cmd.exe 113 PID 4440 wrote to memory of 4556 4440 cmd.exe 114 PID 4440 wrote to memory of 4556 4440 cmd.exe 114 PID 4048 wrote to memory of 5032 4048 svchost.exe 115 PID 4048 wrote to memory of 5032 4048 svchost.exe 115 PID 5032 wrote to memory of 3772 5032 cmd.exe 117 PID 5032 wrote to memory of 3772 5032 cmd.exe 117 PID 4048 wrote to memory of 764 4048 svchost.exe 122 PID 4048 wrote to memory of 764 4048 svchost.exe 122 -
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⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1308 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.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:4048 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:4040 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:3436
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:4468
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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:4440 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:4804
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:4556
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:5032 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:3772
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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:764
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1816
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3376
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:5060
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:388
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
MD5afba56cb6fee3660b751b98418c1fdf1
SHA124364e0e691df3b6e7ebd0e142993fcd6b063984
SHA256df86bc46fdd921147c26c94a4cc054efa01bf2fa837756ffc0139171c8a388d8
SHA512dd138767c127af7e92a696ceccc3b304c99a52392c66d6e8af41f68be8165af55c99ccc62546afbec2da212f207e9b0a66968e73eaab4d3f2821172ff1d3a99b
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Filesize
964B
MD54217b8b83ce3c3f70029a056546f8fd0
SHA1487cdb5733d073a0427418888e8f7070fe782a03
SHA2567d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121
SHA5122a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740