Analysis
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max time kernel
15s -
max time network
17s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
13-12-2024 13:58
Behavioral task
behavioral1
Sample
crynox.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
crynox.exe
Resource
win10v2004-20241007-en
General
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Target
crynox.exe
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Size
299KB
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MD5
e6e2f46331a60acfc399f10ff842345d
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SHA1
514945da2f3518753b22df05786e6dce446d7ec1
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SHA256
c50584f0f5cccb28d192fb2540077792732b8afe1eb887cc3657d60980d9ad02
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SHA512
08842cb745dc04c6a2f0233b69647502cdc2920c2f520415507b98d54b7086f15282ba177baf93c11fbd6415467f1fb84df5a05a8d1923f47737344b6843333c
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SSDEEP
3072:drQkc9kuFo+p2afIyTBjMnuNjg710OpYVm/+FbN/damWsJ7gUev+Tvx:95c9Vf2qIuNLiapdz1JMdv+T
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad\Decrypt_My_File.txt
https://crynoxaowlkauirfhaaiuefjkebfiaeufaebiefuakbjaiurkjahbfiajkfa.vercel.app/decryptor.html
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 3 IoCs
resource yara_rule behavioral1/memory/2404-1-0x0000000000FB0000-0x0000000001000000-memory.dmp family_chaos behavioral1/files/0x000b000000012253-5.dat family_chaos behavioral1/memory/2084-7-0x0000000000D30000-0x0000000000D80000-memory.dmp 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 2516 bcdedit.exe 664 bcdedit.exe -
Renames multiple (189) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 1444 wbadmin.exe -
Disables Task Manager via registry modification
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Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Decrypt_My_File.txt Antimalware Service Executables.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Antimalware Service Executables.url Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini Antimalware Service Executables.exe -
Executes dropped EXE 1 IoCs
pid Process 2084 Antimalware Service Executables.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) 64 IoCs
description ioc Process File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Libraries\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\4DY23DRT\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\98Y29LGS\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Searches\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Downloads\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Pictures\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\YPLB435F\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\T072YXIW\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Documents\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Recorded TV\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\U8F4PBMO\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Music\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Ringtones\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Tablet PC\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\R627XHFP\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Music\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\OM66BHWE\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Documents\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Links\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Desktop\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\History.IE5\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Videos\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Games\Desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini Antimalware Service Executables.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-312935884-697965778-3955649944-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\0996yky9i.jpg" Antimalware Service Executables.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 492 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1956 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2084 Antimalware Service Executables.exe -
Suspicious behavior: EnumeratesProcesses 7 IoCs
pid Process 2404 crynox.exe 2404 crynox.exe 2404 crynox.exe 2084 Antimalware Service Executables.exe 2084 Antimalware Service Executables.exe 2084 Antimalware Service Executables.exe 2084 Antimalware Service Executables.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2404 crynox.exe Token: SeDebugPrivilege 2084 Antimalware Service Executables.exe Token: SeBackupPrivilege 2868 vssvc.exe Token: SeRestorePrivilege 2868 vssvc.exe Token: SeAuditPrivilege 2868 vssvc.exe Token: SeIncreaseQuotaPrivilege 2824 WMIC.exe Token: SeSecurityPrivilege 2824 WMIC.exe Token: SeTakeOwnershipPrivilege 2824 WMIC.exe Token: SeLoadDriverPrivilege 2824 WMIC.exe Token: SeSystemProfilePrivilege 2824 WMIC.exe Token: SeSystemtimePrivilege 2824 WMIC.exe Token: SeProfSingleProcessPrivilege 2824 WMIC.exe Token: SeIncBasePriorityPrivilege 2824 WMIC.exe Token: SeCreatePagefilePrivilege 2824 WMIC.exe Token: SeBackupPrivilege 2824 WMIC.exe Token: SeRestorePrivilege 2824 WMIC.exe Token: SeShutdownPrivilege 2824 WMIC.exe Token: SeDebugPrivilege 2824 WMIC.exe Token: SeSystemEnvironmentPrivilege 2824 WMIC.exe Token: SeRemoteShutdownPrivilege 2824 WMIC.exe Token: SeUndockPrivilege 2824 WMIC.exe Token: SeManageVolumePrivilege 2824 WMIC.exe Token: 33 2824 WMIC.exe Token: 34 2824 WMIC.exe Token: 35 2824 WMIC.exe Token: SeIncreaseQuotaPrivilege 2824 WMIC.exe Token: SeSecurityPrivilege 2824 WMIC.exe Token: SeTakeOwnershipPrivilege 2824 WMIC.exe Token: SeLoadDriverPrivilege 2824 WMIC.exe Token: SeSystemProfilePrivilege 2824 WMIC.exe Token: SeSystemtimePrivilege 2824 WMIC.exe Token: SeProfSingleProcessPrivilege 2824 WMIC.exe Token: SeIncBasePriorityPrivilege 2824 WMIC.exe Token: SeCreatePagefilePrivilege 2824 WMIC.exe Token: SeBackupPrivilege 2824 WMIC.exe Token: SeRestorePrivilege 2824 WMIC.exe Token: SeShutdownPrivilege 2824 WMIC.exe Token: SeDebugPrivilege 2824 WMIC.exe Token: SeSystemEnvironmentPrivilege 2824 WMIC.exe Token: SeRemoteShutdownPrivilege 2824 WMIC.exe Token: SeUndockPrivilege 2824 WMIC.exe Token: SeManageVolumePrivilege 2824 WMIC.exe Token: 33 2824 WMIC.exe Token: 34 2824 WMIC.exe Token: 35 2824 WMIC.exe Token: SeBackupPrivilege 1924 wbengine.exe Token: SeRestorePrivilege 1924 wbengine.exe Token: SeSecurityPrivilege 1924 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2404 wrote to memory of 2084 2404 crynox.exe 30 PID 2404 wrote to memory of 2084 2404 crynox.exe 30 PID 2404 wrote to memory of 2084 2404 crynox.exe 30 PID 2084 wrote to memory of 2720 2084 Antimalware Service Executables.exe 31 PID 2084 wrote to memory of 2720 2084 Antimalware Service Executables.exe 31 PID 2084 wrote to memory of 2720 2084 Antimalware Service Executables.exe 31 PID 2720 wrote to memory of 492 2720 cmd.exe 33 PID 2720 wrote to memory of 492 2720 cmd.exe 33 PID 2720 wrote to memory of 492 2720 cmd.exe 33 PID 2720 wrote to memory of 2824 2720 cmd.exe 36 PID 2720 wrote to memory of 2824 2720 cmd.exe 36 PID 2720 wrote to memory of 2824 2720 cmd.exe 36 PID 2084 wrote to memory of 3052 2084 Antimalware Service Executables.exe 38 PID 2084 wrote to memory of 3052 2084 Antimalware Service Executables.exe 38 PID 2084 wrote to memory of 3052 2084 Antimalware Service Executables.exe 38 PID 3052 wrote to memory of 2516 3052 cmd.exe 40 PID 3052 wrote to memory of 2516 3052 cmd.exe 40 PID 3052 wrote to memory of 2516 3052 cmd.exe 40 PID 3052 wrote to memory of 664 3052 cmd.exe 41 PID 3052 wrote to memory of 664 3052 cmd.exe 41 PID 3052 wrote to memory of 664 3052 cmd.exe 41 PID 2084 wrote to memory of 624 2084 Antimalware Service Executables.exe 42 PID 2084 wrote to memory of 624 2084 Antimalware Service Executables.exe 42 PID 2084 wrote to memory of 624 2084 Antimalware Service Executables.exe 42 PID 624 wrote to memory of 1444 624 cmd.exe 44 PID 624 wrote to memory of 1444 624 cmd.exe 44 PID 624 wrote to memory of 1444 624 cmd.exe 44 PID 2084 wrote to memory of 1956 2084 Antimalware Service Executables.exe 49 PID 2084 wrote to memory of 1956 2084 Antimalware Service Executables.exe 49 PID 2084 wrote to memory of 1956 2084 Antimalware Service Executables.exe 49 -
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\crynox.exe"C:\Users\Admin\AppData\Local\Temp\crynox.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2404 -
C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe"C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe"2⤵
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2084 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2720 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:492
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2824
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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:3052 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2516
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:664
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:624 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1444
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Decrypt_My_File.txt3⤵
- Opens file in notepad (likely ransom note)
PID:1956
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2868
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1924
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2836
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:1992
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
1KB
MD515f57e55659f5dabf91fb3cf52e57e2a
SHA1aa65f8c50caae971f0d4dc1b1f0966fd24da80b1
SHA256c1fb308357cca35f9982722bdd7c3a208cd8bb0568dd9ffba6fa4f2d98afc41c
SHA512548435be6e6bcce47f9d2a54571ea541ac4864a27a4728c4684dd8acbf2ad5a69a55ac0e86e2292f72def6decf282c6765b630a25d98d64f728ef837e24fdb00
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Filesize
299KB
MD5e6e2f46331a60acfc399f10ff842345d
SHA1514945da2f3518753b22df05786e6dce446d7ec1
SHA256c50584f0f5cccb28d192fb2540077792732b8afe1eb887cc3657d60980d9ad02
SHA51208842cb745dc04c6a2f0233b69647502cdc2920c2f520415507b98d54b7086f15282ba177baf93c11fbd6415467f1fb84df5a05a8d1923f47737344b6843333c
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0