Analysis
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max time kernel
869s -
max time network
872s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
26-01-2025 10:45
Behavioral task
behavioral1
Sample
ratbuildransomware.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
25 signatures
900 seconds
General
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Target
ratbuildransomware.exe
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Size
23KB
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MD5
0a1c74e456d2f946369080f5a46b79c0
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SHA1
3a11cf17c826247034f12b63362ee597681a37ca
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SHA256
b6176e42f8eece315692fa7ec9a37190f1ec8353fc85a7b1042af4b06f1f489e
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SHA512
27133929dafc8c5abc954baa3491c603dbaa866155ebf32d25860ec0da879a024e6207767943bae36e2b8faaeac7f7a52d254b8f26e0bd17ef747c3c6d2db963
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SSDEEP
384:b3MLWHn3kIef/ZXRtLWW3pXHVYILpJrr91CzxbeteT:Hn3kIcpj3pXHVY0nrr9ixbYeT
Malware Config
Extracted
Path
C:\Users\Admin\Desktop\read_it.txt
Family
chaos
Ransom Note
----> Chaos is multi language ransomware. Translate your note to any language <----
All of your files have been encrypted
Your computer was infected with a ransomware virus. Your files have been encrypted and you won't
be able to decrypt them without our help.What can I do to get my files back?You can buy our special
decryption software, this software will allow you to recover all of your data and remove the
ransomware from your computer.The price for the software is $1,500. Payment can be made in Bitcoin only.
How do I pay, where do I get Bitcoin?
Purchasing Bitcoin varies from country to country, you are best advised to do a quick google search
yourself to find out how to buy Bitcoin.
Many of our customers have reported these sites to be fast and reliable:
Coinmama - hxxps://www.coinmama.com Bitpanda - hxxps://www.bitpanda.com
Payment informationAmount: $35 USD
Bitcoin Address: bc1qau23yqew650myzt5xatzkcl2seeefjs5v9t94r
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/3116-1-0x0000000000BE0000-0x0000000000BEC000-memory.dmp family_chaos behavioral1/files/0x0007000000023cb6-6.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 4216 bcdedit.exe 708 bcdedit.exe -
pid Process 720 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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation ratbuildransomware.exe Key value queried \REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000\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\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 3036 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\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\Camera Roll\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\Internet Explorer\Quick Launch\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\Downloads\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\Start Menu\Programs\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3227495264-2217614367-4027411560-1000\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\Start Menu\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\Accessories\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\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\Windows\AccountPictures\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\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\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\Desktop\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\Favorites\Links\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\Recent\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\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini 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 -
Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString EXCEL.EXE Key opened \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz EXCEL.EXE -
Enumerates system info in registry 2 TTPs 3 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\Hardware\Description\System\BIOS EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily EXCEL.EXE Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU EXCEL.EXE -
Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 3532 vssadmin.exe -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3227495264-2217614367-4027411560-1000_Classes\Local Settings svchost.exe -
Opens file in notepad (likely ransom note) 2 IoCs
pid Process 996 NOTEPAD.EXE 1152 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 3036 svchost.exe 4724 EXCEL.EXE -
Suspicious behavior: EnumeratesProcesses 47 IoCs
pid Process 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3116 ratbuildransomware.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe 3036 svchost.exe -
Suspicious use of AdjustPrivilegeToken 50 IoCs
description pid Process Token: SeDebugPrivilege 3116 ratbuildransomware.exe Token: SeDebugPrivilege 3036 svchost.exe Token: SeBackupPrivilege 4224 vssvc.exe Token: SeRestorePrivilege 4224 vssvc.exe Token: SeAuditPrivilege 4224 vssvc.exe Token: SeIncreaseQuotaPrivilege 1632 WMIC.exe Token: SeSecurityPrivilege 1632 WMIC.exe Token: SeTakeOwnershipPrivilege 1632 WMIC.exe Token: SeLoadDriverPrivilege 1632 WMIC.exe Token: SeSystemProfilePrivilege 1632 WMIC.exe Token: SeSystemtimePrivilege 1632 WMIC.exe Token: SeProfSingleProcessPrivilege 1632 WMIC.exe Token: SeIncBasePriorityPrivilege 1632 WMIC.exe Token: SeCreatePagefilePrivilege 1632 WMIC.exe Token: SeBackupPrivilege 1632 WMIC.exe Token: SeRestorePrivilege 1632 WMIC.exe Token: SeShutdownPrivilege 1632 WMIC.exe Token: SeDebugPrivilege 1632 WMIC.exe Token: SeSystemEnvironmentPrivilege 1632 WMIC.exe Token: SeRemoteShutdownPrivilege 1632 WMIC.exe Token: SeUndockPrivilege 1632 WMIC.exe Token: SeManageVolumePrivilege 1632 WMIC.exe Token: 33 1632 WMIC.exe Token: 34 1632 WMIC.exe Token: 35 1632 WMIC.exe Token: 36 1632 WMIC.exe Token: SeIncreaseQuotaPrivilege 1632 WMIC.exe Token: SeSecurityPrivilege 1632 WMIC.exe Token: SeTakeOwnershipPrivilege 1632 WMIC.exe Token: SeLoadDriverPrivilege 1632 WMIC.exe Token: SeSystemProfilePrivilege 1632 WMIC.exe Token: SeSystemtimePrivilege 1632 WMIC.exe Token: SeProfSingleProcessPrivilege 1632 WMIC.exe Token: SeIncBasePriorityPrivilege 1632 WMIC.exe Token: SeCreatePagefilePrivilege 1632 WMIC.exe Token: SeBackupPrivilege 1632 WMIC.exe Token: SeRestorePrivilege 1632 WMIC.exe Token: SeShutdownPrivilege 1632 WMIC.exe Token: SeDebugPrivilege 1632 WMIC.exe Token: SeSystemEnvironmentPrivilege 1632 WMIC.exe Token: SeRemoteShutdownPrivilege 1632 WMIC.exe Token: SeUndockPrivilege 1632 WMIC.exe Token: SeManageVolumePrivilege 1632 WMIC.exe Token: 33 1632 WMIC.exe Token: 34 1632 WMIC.exe Token: 35 1632 WMIC.exe Token: 36 1632 WMIC.exe Token: SeBackupPrivilege 1968 wbengine.exe Token: SeRestorePrivilege 1968 wbengine.exe Token: SeSecurityPrivilege 1968 wbengine.exe -
Suspicious use of SetWindowsHookEx 9 IoCs
pid Process 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE 4724 EXCEL.EXE -
Suspicious use of WriteProcessMemory 20 IoCs
description pid Process procid_target PID 3116 wrote to memory of 3036 3116 ratbuildransomware.exe 82 PID 3116 wrote to memory of 3036 3116 ratbuildransomware.exe 82 PID 3036 wrote to memory of 5008 3036 svchost.exe 83 PID 3036 wrote to memory of 5008 3036 svchost.exe 83 PID 5008 wrote to memory of 3532 5008 cmd.exe 85 PID 5008 wrote to memory of 3532 5008 cmd.exe 85 PID 5008 wrote to memory of 1632 5008 cmd.exe 89 PID 5008 wrote to memory of 1632 5008 cmd.exe 89 PID 3036 wrote to memory of 3152 3036 svchost.exe 92 PID 3036 wrote to memory of 3152 3036 svchost.exe 92 PID 3152 wrote to memory of 4216 3152 cmd.exe 94 PID 3152 wrote to memory of 4216 3152 cmd.exe 94 PID 3152 wrote to memory of 708 3152 cmd.exe 95 PID 3152 wrote to memory of 708 3152 cmd.exe 95 PID 3036 wrote to memory of 2472 3036 svchost.exe 96 PID 3036 wrote to memory of 2472 3036 svchost.exe 96 PID 2472 wrote to memory of 720 2472 cmd.exe 98 PID 2472 wrote to memory of 720 2472 cmd.exe 98 PID 3036 wrote to memory of 996 3036 svchost.exe 104 PID 3036 wrote to memory of 996 3036 svchost.exe 104 -
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\ratbuildransomware.exe"C:\Users\Admin\AppData\Local\Temp\ratbuildransomware.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3116 -
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)
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3036 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:5008 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:3532
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1632
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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:3152 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:4216
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:708
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2472 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:720
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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:996
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4224
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1968
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:4456
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
PID:4504
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\read_it.txt1⤵
- Opens file in notepad (likely ransom note)
PID:1152
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C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" /n "C:\Users\Admin\Desktop\GroupEnter.xlt"1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:4724
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
23KB
MD50a1c74e456d2f946369080f5a46b79c0
SHA13a11cf17c826247034f12b63362ee597681a37ca
SHA256b6176e42f8eece315692fa7ec9a37190f1ec8353fc85a7b1042af4b06f1f489e
SHA51227133929dafc8c5abc954baa3491c603dbaa866155ebf32d25860ec0da879a024e6207767943bae36e2b8faaeac7f7a52d254b8f26e0bd17ef747c3c6d2db963
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Filesize
956B
MD5c3559ef93c3ada6ec311f111a8868628
SHA1df773a84993baa251107544a8748982f655fc5f3
SHA25617c1ec0d1cd64a069e664be4aee72fbdad3c83049b405367f3b22be158d0d180
SHA5127e085ca1708fbe4049002375061e31c621eea6d5d210788f5efaf890d498464d97c6fd6980684dd8f8e60f1642f4c151411841c97c6468f80cf7bb5ec5eed82a