Analysis
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max time kernel
37s -
max time network
16s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
14-12-2024 12:51
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
599KB
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MD5
f9f3379858516f1ec7c3474dba4cfe13
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SHA1
2365e729155dad22856e09275cb94369889d4f14
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SHA256
d36c18499800859f77d6c2462a99b6e5e5e066fff95418dce4d5fdb8d45d0106
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SHA512
4fcab92050504619a581043023dcbc106a816d1fe134c5f351478295281d08bfc50ab4a77e7c59210aa2bf4b704ffee6b0c27f4d3153703087b86d5a633b2b5b
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SSDEEP
12288:1Iw6EkPJU2XGyVdEcIf/vbIGSA4Jxv+T:8SJyIP8
Malware Config
Extracted
C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad\read_it.txt
https://crynoxaowlkauirfhaaiuefjkebfiaeufaebiefuakbjaiurkjahbfiajkfa.vercel.app/index.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/2984-1-0x0000000000340000-0x00000000003DA000-memory.dmp family_chaos behavioral1/files/0x0008000000012117-5.dat family_chaos behavioral1/memory/2844-7-0x0000000001260000-0x00000000012FA000-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 1412 bcdedit.exe -
Renames multiple (181) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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pid Process 2544 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\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 2844 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) 64 IoCs
description ioc Process 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\Start Menu\Programs\Administrative Tools\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\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\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\Internet Explorer\Quick Launch\User Pinned\TaskBar\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\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\desktop.ini svchost.exe File opened for modification C:\Users\Public\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\QMPQWRBT\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Ringtones\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini svchost.exe File opened for modification C:\Users\Admin\Documents\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\39RANI6K\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Maintenance\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\Contacts\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\U3EGUGI8\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Public\Libraries\desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\Sample Music\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Burn\Burn\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Recorded TV\Sample Media\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Feeds Cache\AQYH36ZT\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\History\History.IE5\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows Mail\Stationery\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\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\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini svchost.exe File opened for modification C:\Users\Public\Music\desktop.ini svchost.exe File opened for modification C:\Users\Public\Pictures\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\Searches\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Accessories\Tablet PC\Desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\BY17T927\desktop.ini svchost.exe File opened for modification C:\Users\All Users\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini svchost.exe File opened for modification C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3063565911-2056067323-3330884624-1000\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\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\UGWF8QWZ\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\0fpu96ljl.jpg" svchost.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 1224 vssadmin.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 332 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 2844 svchost.exe -
Suspicious behavior: EnumeratesProcesses 7 IoCs
pid Process 2984 crynox.exe 2984 crynox.exe 2984 crynox.exe 2844 svchost.exe 2844 svchost.exe 2844 svchost.exe 2844 svchost.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 2984 crynox.exe Token: SeDebugPrivilege 2844 svchost.exe Token: SeBackupPrivilege 1708 vssvc.exe Token: SeRestorePrivilege 1708 vssvc.exe Token: SeAuditPrivilege 1708 vssvc.exe Token: SeIncreaseQuotaPrivilege 1212 WMIC.exe Token: SeSecurityPrivilege 1212 WMIC.exe Token: SeTakeOwnershipPrivilege 1212 WMIC.exe Token: SeLoadDriverPrivilege 1212 WMIC.exe Token: SeSystemProfilePrivilege 1212 WMIC.exe Token: SeSystemtimePrivilege 1212 WMIC.exe Token: SeProfSingleProcessPrivilege 1212 WMIC.exe Token: SeIncBasePriorityPrivilege 1212 WMIC.exe Token: SeCreatePagefilePrivilege 1212 WMIC.exe Token: SeBackupPrivilege 1212 WMIC.exe Token: SeRestorePrivilege 1212 WMIC.exe Token: SeShutdownPrivilege 1212 WMIC.exe Token: SeDebugPrivilege 1212 WMIC.exe Token: SeSystemEnvironmentPrivilege 1212 WMIC.exe Token: SeRemoteShutdownPrivilege 1212 WMIC.exe Token: SeUndockPrivilege 1212 WMIC.exe Token: SeManageVolumePrivilege 1212 WMIC.exe Token: 33 1212 WMIC.exe Token: 34 1212 WMIC.exe Token: 35 1212 WMIC.exe Token: SeIncreaseQuotaPrivilege 1212 WMIC.exe Token: SeSecurityPrivilege 1212 WMIC.exe Token: SeTakeOwnershipPrivilege 1212 WMIC.exe Token: SeLoadDriverPrivilege 1212 WMIC.exe Token: SeSystemProfilePrivilege 1212 WMIC.exe Token: SeSystemtimePrivilege 1212 WMIC.exe Token: SeProfSingleProcessPrivilege 1212 WMIC.exe Token: SeIncBasePriorityPrivilege 1212 WMIC.exe Token: SeCreatePagefilePrivilege 1212 WMIC.exe Token: SeBackupPrivilege 1212 WMIC.exe Token: SeRestorePrivilege 1212 WMIC.exe Token: SeShutdownPrivilege 1212 WMIC.exe Token: SeDebugPrivilege 1212 WMIC.exe Token: SeSystemEnvironmentPrivilege 1212 WMIC.exe Token: SeRemoteShutdownPrivilege 1212 WMIC.exe Token: SeUndockPrivilege 1212 WMIC.exe Token: SeManageVolumePrivilege 1212 WMIC.exe Token: 33 1212 WMIC.exe Token: 34 1212 WMIC.exe Token: 35 1212 WMIC.exe Token: SeBackupPrivilege 2896 wbengine.exe Token: SeRestorePrivilege 2896 wbengine.exe Token: SeSecurityPrivilege 2896 wbengine.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 332 NOTEPAD.EXE -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 2984 wrote to memory of 2844 2984 crynox.exe 30 PID 2984 wrote to memory of 2844 2984 crynox.exe 30 PID 2984 wrote to memory of 2844 2984 crynox.exe 30 PID 2844 wrote to memory of 2704 2844 svchost.exe 31 PID 2844 wrote to memory of 2704 2844 svchost.exe 31 PID 2844 wrote to memory of 2704 2844 svchost.exe 31 PID 2704 wrote to memory of 1224 2704 cmd.exe 33 PID 2704 wrote to memory of 1224 2704 cmd.exe 33 PID 2704 wrote to memory of 1224 2704 cmd.exe 33 PID 2704 wrote to memory of 1212 2704 cmd.exe 36 PID 2704 wrote to memory of 1212 2704 cmd.exe 36 PID 2704 wrote to memory of 1212 2704 cmd.exe 36 PID 2844 wrote to memory of 2116 2844 svchost.exe 38 PID 2844 wrote to memory of 2116 2844 svchost.exe 38 PID 2844 wrote to memory of 2116 2844 svchost.exe 38 PID 2116 wrote to memory of 2516 2116 cmd.exe 40 PID 2116 wrote to memory of 2516 2116 cmd.exe 40 PID 2116 wrote to memory of 2516 2116 cmd.exe 40 PID 2116 wrote to memory of 1412 2116 cmd.exe 41 PID 2116 wrote to memory of 1412 2116 cmd.exe 41 PID 2116 wrote to memory of 1412 2116 cmd.exe 41 PID 2844 wrote to memory of 320 2844 svchost.exe 42 PID 2844 wrote to memory of 320 2844 svchost.exe 42 PID 2844 wrote to memory of 320 2844 svchost.exe 42 PID 320 wrote to memory of 2544 320 cmd.exe 44 PID 320 wrote to memory of 2544 320 cmd.exe 44 PID 320 wrote to memory of 2544 320 cmd.exe 44 PID 2844 wrote to memory of 332 2844 svchost.exe 49 PID 2844 wrote to memory of 332 2844 svchost.exe 49 PID 2844 wrote to memory of 332 2844 svchost.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:2984 -
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.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:2844 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:2704 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1224
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1212
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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:2116 -
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:1412
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:320 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:2544
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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)
- Suspicious use of FindShellTrayWindow
PID:332
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1708
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2896
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1532
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2636
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
1KB
MD5a55f796e9445ce36622c596f1b112ae6
SHA1ceaa93ef5fc6447afa0c082ac90defc821d345fd
SHA25616b656de9ae1111a9f4b73f28296a3c06a5fbc7477bb3a48b0b9383d49b0a736
SHA512831ecb7aa8d454a34bfe47ffa460d623c1364c6007fe55b3e4bc6cfb482f3688ce76ad1fb5ad952049084e703da17fec3118b70cdf666f7cd6cb745dea68ba10
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0
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Filesize
599KB
MD5f9f3379858516f1ec7c3474dba4cfe13
SHA12365e729155dad22856e09275cb94369889d4f14
SHA256d36c18499800859f77d6c2462a99b6e5e5e066fff95418dce4d5fdb8d45d0106
SHA5124fcab92050504619a581043023dcbc106a816d1fe134c5f351478295281d08bfc50ab4a77e7c59210aa2bf4b704ffee6b0c27f4d3153703087b86d5a633b2b5b