Analysis
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max time kernel
34s -
max time network
35s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
13-12-2024 13:41
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\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 2 IoCs
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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
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Renames multiple (184) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
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Deletes backup catalog 3 TTPs 1 IoCs
Uses wbadmin.exe to inhibit system recovery.
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Disables Task Manager via registry modification
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Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
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Drops startup file 3 IoCs
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Executes dropped EXE 1 IoCs
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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
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Sets desktop wallpaper using registry 2 TTPs 1 IoCs
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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.
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Interacts with shadow copies 3 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
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Modifies registry class 1 IoCs
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Opens file in notepad (likely ransom note) 1 IoCs
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Suspicious behavior: AddClipboardFormatListener 1 IoCs
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Suspicious behavior: EnumeratesProcesses 53 IoCs
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Suspicious use of AdjustPrivilegeToken 50 IoCs
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Suspicious use of WriteProcessMemory 20 IoCs
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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⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe"C:\Users\Admin\AppData\Roaming\Antimalware Service Executables.exe"2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Drops desktop.ini file(s)
- Sets desktop wallpaper using registry
- Modifies registry class
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
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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
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C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
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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)
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵
- Checks SCSI registry key(s)
Network
MITRE ATT&CK Enterprise v15
Defense Evasion
Direct Volume Access
1Indicator Removal
3File Deletion
3Modify Registry
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
6KB
MD538ef492a7eb7d2617cc3abe708e7ee91
SHA143b02b04ddd3389a72984e9294de343826fbdf18
SHA256ad5b201c3bd188e985cec4201e0cf73a44979a4ad2d10f38935ed242aa7387a2
SHA512070505c942f97e1dc68f60472bb4bea69c308a0bd3afe3faf429374df48c904253f39dd540af2d67de7049f3a42d30185d98445063a5193c04b7347d827ad66c
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Filesize
226B
MD528d7fcc2b910da5e67ebb99451a5f598
SHA1a5bf77a53eda1208f4f37d09d82da0b9915a6747
SHA2562391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c
SHA5122d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6
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Filesize
308KB
MD5726620b8147063804324e16bf7e847b0
SHA10c4831ee49e3114bfd590dbd77b66890af172869
SHA25606f70e1b456e0eb7054e2b341ff9c6feb562e3d584ca127680b9fc6b9cf065f8
SHA512f907c5afae6b20e4d9d837d9a970b256ae405a88d0fbc5dd391133865fc80e37cdba95c907c9b6009bc2e61bc0182d904622c6b4535776ada90c4f9d0519572e
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Filesize
1B
MD5d1457b72c3fb323a2671125aef3eab5d
SHA15bab61eb53176449e25c2c82f172b82cb13ffb9d
SHA2568a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
SHA512ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0
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Filesize
8KB
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Filesize
328KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
10.8MB