Analysis
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max time kernel
122s -
max time network
123s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
13-12-2024 13:43
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
308KB
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MD5
726620b8147063804324e16bf7e847b0
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SHA1
0c4831ee49e3114bfd590dbd77b66890af172869
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SHA256
06f70e1b456e0eb7054e2b341ff9c6feb562e3d584ca127680b9fc6b9cf065f8
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SHA512
f907c5afae6b20e4d9d837d9a970b256ae405a88d0fbc5dd391133865fc80e37cdba95c907c9b6009bc2e61bc0182d904622c6b4535776ada90c4f9d0519572e
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SSDEEP
3072:k12QKc97OFo+p2afIyTBjMnuNjg710OpYVm/+FbN/damWsJ9gUev+Tvx:c2rc9Af2qIuNLiapdz1Jqdv+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/2112-1-0x0000000000A90000-0x0000000000AE2000-memory.dmp family_chaos behavioral1/memory/2976-7-0x00000000009F0000-0x0000000000A42000-memory.dmp family_chaos behavioral1/files/0x0009000000012117-6.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 2524 bcdedit.exe 2540 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 2968 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\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 File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Decrypt_My_File.txt Antimalware Service Executables.exe -
Executes dropped EXE 1 IoCs
pid Process 2976 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\Admin\Contacts\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\Desktop\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\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\SK4ZQZYF\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\Public\Music\Sample Music\desktop.ini Antimalware Service Executables.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-4177215427-74451935-3209572229-1000\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\Feeds Cache\XMOOPFZ1\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\Public\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\Recorded TV\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\Admin\Saved Games\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\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\Accessibility\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\Public\Music\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\BAFOJIJD\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\Public\Documents\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\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\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\Downloads\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Public\Videos\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\60QKHYE2\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\WMBPAEF9\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\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\Y07CWM3B\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\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\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\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\Public\Pictures\Sample Pictures\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\Favorites\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\Admin\AppData\Roaming\Microsoft\Windows\SendTo\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\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\Windows PowerShell\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\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\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\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\09OB1FV8\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\5WY8FHO4\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\AppData\Roaming\Microsoft\Windows\Recent\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\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\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\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini Antimalware Service Executables.exe File opened for modification C:\Users\Default\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\Libraries\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-1-5-21-4177215427-74451935-3209572229-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\qej42psfn.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 864 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 1732 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2976 Antimalware Service Executables.exe -
Suspicious behavior: EnumeratesProcesses 7 IoCs
pid Process 2112 crynox.exe 2112 crynox.exe 2112 crynox.exe 2976 Antimalware Service Executables.exe 2976 Antimalware Service Executables.exe 2976 Antimalware Service Executables.exe 2976 Antimalware Service Executables.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2112 crynox.exe Token: SeDebugPrivilege 2976 Antimalware Service Executables.exe Token: SeBackupPrivilege 2428 vssvc.exe Token: SeRestorePrivilege 2428 vssvc.exe Token: SeAuditPrivilege 2428 vssvc.exe Token: SeIncreaseQuotaPrivilege 2204 WMIC.exe Token: SeSecurityPrivilege 2204 WMIC.exe Token: SeTakeOwnershipPrivilege 2204 WMIC.exe Token: SeLoadDriverPrivilege 2204 WMIC.exe Token: SeSystemProfilePrivilege 2204 WMIC.exe Token: SeSystemtimePrivilege 2204 WMIC.exe Token: SeProfSingleProcessPrivilege 2204 WMIC.exe Token: SeIncBasePriorityPrivilege 2204 WMIC.exe Token: SeCreatePagefilePrivilege 2204 WMIC.exe Token: SeBackupPrivilege 2204 WMIC.exe Token: SeRestorePrivilege 2204 WMIC.exe Token: SeShutdownPrivilege 2204 WMIC.exe Token: SeDebugPrivilege 2204 WMIC.exe Token: SeSystemEnvironmentPrivilege 2204 WMIC.exe Token: SeRemoteShutdownPrivilege 2204 WMIC.exe Token: SeUndockPrivilege 2204 WMIC.exe Token: SeManageVolumePrivilege 2204 WMIC.exe Token: 33 2204 WMIC.exe Token: 34 2204 WMIC.exe Token: 35 2204 WMIC.exe Token: SeIncreaseQuotaPrivilege 2204 WMIC.exe Token: SeSecurityPrivilege 2204 WMIC.exe Token: SeTakeOwnershipPrivilege 2204 WMIC.exe Token: SeLoadDriverPrivilege 2204 WMIC.exe Token: SeSystemProfilePrivilege 2204 WMIC.exe Token: SeSystemtimePrivilege 2204 WMIC.exe Token: SeProfSingleProcessPrivilege 2204 WMIC.exe Token: SeIncBasePriorityPrivilege 2204 WMIC.exe Token: SeCreatePagefilePrivilege 2204 WMIC.exe Token: SeBackupPrivilege 2204 WMIC.exe Token: SeRestorePrivilege 2204 WMIC.exe Token: SeShutdownPrivilege 2204 WMIC.exe Token: SeDebugPrivilege 2204 WMIC.exe Token: SeSystemEnvironmentPrivilege 2204 WMIC.exe Token: SeRemoteShutdownPrivilege 2204 WMIC.exe Token: SeUndockPrivilege 2204 WMIC.exe Token: SeManageVolumePrivilege 2204 WMIC.exe Token: 33 2204 WMIC.exe Token: 34 2204 WMIC.exe Token: 35 2204 WMIC.exe Token: SeBackupPrivilege 276 wbengine.exe Token: SeRestorePrivilege 276 wbengine.exe Token: SeSecurityPrivilege 276 wbengine.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2112 wrote to memory of 2976 2112 crynox.exe 30 PID 2112 wrote to memory of 2976 2112 crynox.exe 30 PID 2112 wrote to memory of 2976 2112 crynox.exe 30 PID 2976 wrote to memory of 2100 2976 Antimalware Service Executables.exe 31 PID 2976 wrote to memory of 2100 2976 Antimalware Service Executables.exe 31 PID 2976 wrote to memory of 2100 2976 Antimalware Service Executables.exe 31 PID 2100 wrote to memory of 864 2100 cmd.exe 33 PID 2100 wrote to memory of 864 2100 cmd.exe 33 PID 2100 wrote to memory of 864 2100 cmd.exe 33 PID 2100 wrote to memory of 2204 2100 cmd.exe 36 PID 2100 wrote to memory of 2204 2100 cmd.exe 36 PID 2100 wrote to memory of 2204 2100 cmd.exe 36 PID 2976 wrote to memory of 2452 2976 Antimalware Service Executables.exe 38 PID 2976 wrote to memory of 2452 2976 Antimalware Service Executables.exe 38 PID 2976 wrote to memory of 2452 2976 Antimalware Service Executables.exe 38 PID 2452 wrote to memory of 2524 2452 cmd.exe 40 PID 2452 wrote to memory of 2524 2452 cmd.exe 40 PID 2452 wrote to memory of 2524 2452 cmd.exe 40 PID 2452 wrote to memory of 2540 2452 cmd.exe 41 PID 2452 wrote to memory of 2540 2452 cmd.exe 41 PID 2452 wrote to memory of 2540 2452 cmd.exe 41 PID 2976 wrote to memory of 2580 2976 Antimalware Service Executables.exe 42 PID 2976 wrote to memory of 2580 2976 Antimalware Service Executables.exe 42 PID 2976 wrote to memory of 2580 2976 Antimalware Service Executables.exe 42 PID 2580 wrote to memory of 2968 2580 cmd.exe 44 PID 2580 wrote to memory of 2968 2580 cmd.exe 44 PID 2580 wrote to memory of 2968 2580 cmd.exe 44 PID 2976 wrote to memory of 1732 2976 Antimalware Service Executables.exe 49 PID 2976 wrote to memory of 1732 2976 Antimalware Service Executables.exe 49 PID 2976 wrote to memory of 1732 2976 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:2112 -
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:2976 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2100 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:864
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:2204
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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:2452 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:2524
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:2540
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:2580 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2968
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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:1732
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2428
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:276
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1852
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:1360
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
6KB
MD538ef492a7eb7d2617cc3abe708e7ee91
SHA143b02b04ddd3389a72984e9294de343826fbdf18
SHA256ad5b201c3bd188e985cec4201e0cf73a44979a4ad2d10f38935ed242aa7387a2
SHA512070505c942f97e1dc68f60472bb4bea69c308a0bd3afe3faf429374df48c904253f39dd540af2d67de7049f3a42d30185d98445063a5193c04b7347d827ad66c
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Filesize
308KB
MD5726620b8147063804324e16bf7e847b0
SHA10c4831ee49e3114bfd590dbd77b66890af172869
SHA25606f70e1b456e0eb7054e2b341ff9c6feb562e3d584ca127680b9fc6b9cf065f8
SHA512f907c5afae6b20e4d9d837d9a970b256ae405a88d0fbc5dd391133865fc80e37cdba95c907c9b6009bc2e61bc0182d904622c6b4535776ada90c4f9d0519572e
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0