Analysis Overview
SHA256
329dc7144e9e0e49aa9b7e3d495eb2a329579ea9d68249f93c3942179ece3cf6
Threat Level: Known bad
The file C11Setup.exe was found to be: Known bad.
Malicious Activity Summary
Chaos Ransomware
Chaos
Chaos family
Deletes shadow copies
Modifies boot configuration data using bcdedit
Deletes backup catalog
Reads user/profile data of web browsers
Drops startup file
Executes dropped EXE
Drops desktop.ini file(s)
Sets desktop wallpaper using registry
Enumerates physical storage devices
Unsigned PE
Suspicious behavior: EnumeratesProcesses
Checks SCSI registry key(s)
Suspicious use of AdjustPrivilegeToken
Uses Volume Shadow Copy service COM API
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Interacts with shadow copies
Modifies registry class
Opens file in notepad (likely ransom note)
Suspicious behavior: AddClipboardFormatListener
MITRE ATT&CK Matrix V13
Analysis: static1
Detonation Overview
Reported
2024-04-19 22:37
Signatures
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Chaos family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-04-19 22:37
Reported
2024-04-19 22:39
Platform
win11-20240412-en
Max time kernel
93s
Max time network
93s
Command Line
Signatures
Chaos
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
| N/A | N/A | N/A | N/A |
Deletes shadow copies
Modifies boot configuration data using bcdedit
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\bcdedit.exe | N/A |
| N/A | N/A | C:\Windows\system32\bcdedit.exe | N/A |
Deletes backup catalog
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\wbadmin.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\C11Setup.url | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\read_it.txt | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
Reads user/profile data of web browsers
Drops desktop.ini file(s)
| Description | Indicator | Process | Target |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\System Tools\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Desktop\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Pictures\Camera Roll\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\AccountPictures\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Documents\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Pictures\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Public\Documents\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Public\Pictures\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Music\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\OneDrive\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Favorites\Links\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | F:\$RECYCLE.BIN\S-1-5-21-801878912-692986033-442676226-1000\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Pictures\Saved Pictures\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Videos\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Links\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Searches\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Public\Music\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Public\Desktop\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Contacts\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Public\Videos\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Downloads\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Saved Games\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\Favorites\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessibility\desktop.ini | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
Sets desktop wallpaper using registry
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-801878912-692986033-442676226-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\771gn3ojg.jpg" | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
Enumerates physical storage devices
Checks SCSI registry key(s)
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CdRom&Ven_QEMU&Prod_QEMU_DVD-ROM\4&215468a5&0&010000\FriendlyName | C:\Windows\System32\vds.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\DISK&VEN_DADY&PROD_HARDDISK\4&215468A5&0&000000 | C:\Windows\System32\vds.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName | C:\Windows\System32\vds.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\CDROM&VEN_QEMU&PROD_QEMU_DVD-ROM\4&215468A5&0&010000 | C:\Windows\System32\vds.exe | N/A |
Interacts with shadow copies
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\vssadmin.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-801878912-692986033-442676226-1000_Classes\Local Settings | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
Opens file in notepad (likely ransom note)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\NOTEPAD.EXE | N/A |
Suspicious behavior: AddClipboardFormatListener
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\C11Setup.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Roaming\C11Setup.exe | N/A |
| Token: SeBackupPrivilege | N/A | C:\Windows\system32\vssvc.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Windows\system32\vssvc.exe | N/A |
| Token: SeAuditPrivilege | N/A | C:\Windows\system32\vssvc.exe | N/A |
| Token: SeIncreaseQuotaPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSecurityPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeLoadDriverPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSystemProfilePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSystemtimePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeProfSingleProcessPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeCreatePagefilePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeBackupPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeShutdownPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSystemEnvironmentPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeRemoteShutdownPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeUndockPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeManageVolumePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 33 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 34 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 35 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 36 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeIncreaseQuotaPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSecurityPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeTakeOwnershipPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeLoadDriverPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSystemProfilePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSystemtimePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeProfSingleProcessPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeCreatePagefilePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeBackupPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeShutdownPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeSystemEnvironmentPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeRemoteShutdownPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeUndockPrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeManageVolumePrivilege | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 33 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 34 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 35 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: 36 | N/A | C:\Windows\System32\Wbem\WMIC.exe | N/A |
| Token: SeBackupPrivilege | N/A | C:\Windows\system32\wbengine.exe | N/A |
| Token: SeRestorePrivilege | N/A | C:\Windows\system32\wbengine.exe | N/A |
| Token: SeSecurityPrivilege | N/A | C:\Windows\system32\wbengine.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Uses Volume Shadow Copy service COM API
Processes
C:\Users\Admin\AppData\Local\Temp\C11Setup.exe
"C:\Users\Admin\AppData\Local\Temp\C11Setup.exe"
C:\Users\Admin\AppData\Roaming\C11Setup.exe
"C:\Users\Admin\AppData\Roaming\C11Setup.exe"
C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
C:\Windows\system32\vssadmin.exe
vssadmin delete shadows /all /quiet
C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
C:\Windows\System32\Wbem\WMIC.exe
wmic shadowcopy delete
C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
C:\Windows\system32\bcdedit.exe
bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\system32\bcdedit.exe
bcdedit /set {default} recoveryenabled no
C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
C:\Windows\system32\wbadmin.exe
wbadmin delete catalog -quiet
C:\Windows\system32\wbengine.exe
"C:\Windows\system32\wbengine.exe"
C:\Windows\System32\vdsldr.exe
C:\Windows\System32\vdsldr.exe -Embedding
C:\Windows\System32\vds.exe
C:\Windows\System32\vds.exe
C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
Network
Files
memory/232-0-0x0000000000920000-0x0000000000972000-memory.dmp
memory/232-1-0x00007FFCE4370000-0x00007FFCE4E32000-memory.dmp
C:\Users\Admin\AppData\Roaming\C11Setup.exe
| MD5 | 7b3efaefb41b7136502139438a6968e4 |
| SHA1 | 84b25e639e5e1ee0519d5731a7810e0a312f3010 |
| SHA256 | 329dc7144e9e0e49aa9b7e3d495eb2a329579ea9d68249f93c3942179ece3cf6 |
| SHA512 | 62646bdbfa3ca43327885c93f2b6821f1f3c896791a147aa0981f1be269cc19eb77050f0305d0ac3c1db8e868894523d785c8b7059d264d9fb653c4d47357777 |
memory/232-15-0x00007FFCE4370000-0x00007FFCE4E32000-memory.dmp
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\C11Setup.exe.log
| MD5 | 4ae344179932dc8e2c6fe2079f9753ef |
| SHA1 | 60eacc624412b1f34809780769e3b212f138ea9c |
| SHA256 | 3063de3898a9b34e19f8cf0beeec2b8bd6bd05896b52abd73f4703d07b8a7cd4 |
| SHA512 | fadfe2b83f1af8fdc50430325f69d6172d2c1e889ca3800b3b83e5535d5970c32e9a176b48563275a0630d56c96d9f88df148fd6b2d281f0fc58129e5f4dba19 |
memory/476-16-0x00007FFCE4370000-0x00007FFCE4E32000-memory.dmp
C:\Users\Admin\Desktop\read_it.txt
| MD5 | 4217b8b83ce3c3f70029a056546f8fd0 |
| SHA1 | 487cdb5733d073a0427418888e8f7070fe782a03 |
| SHA256 | 7d767e907be373c680d1f7884d779588eb643bebb3f27bf3b5ed4864aa4d8121 |
| SHA512 | 2a58c99fa52f99c276e27eb98aef2ce1205f16d1e37b7e87eb69e9ecda22b578195a43f1a7f70fead6ba70421abf2f85c917551c191536eaf1f3011d3d24f740 |
memory/476-70-0x000000001B310000-0x000000001B320000-memory.dmp
memory/476-72-0x00007FFCE4370000-0x00007FFCE4E32000-memory.dmp
memory/476-73-0x000000001B310000-0x000000001B320000-memory.dmp