Analysis
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max time kernel
71s -
max time network
7s -
platform
windows7_x64 -
resource
win7-en-20211208 -
submitted
17-01-2022 15:54
Static task
static1
Behavioral task
behavioral1
Sample
AZ(DANGEROUS).exe
Resource
win7-en-20211208
Behavioral task
behavioral2
Sample
AZ(DANGEROUS).exe
Resource
win10v2004-en-20220113
General
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Target
AZ(DANGEROUS).exe
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Size
549KB
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MD5
b3858953d8c79049f6a46b254e6eab6b
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SHA1
e4407979997b5e1000abaac3a75545e82e8a15b9
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SHA256
6a3e60f725d30ab2660c6c9e6928bafe273583e3e501097934e873593a13aee6
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SHA512
6c37402f8b3d76320b5b1db246a3376919ac77e48f1f66d666c5c904519e644daf992e7917632e072cd4b7df91cc42fc0a9cdae84892d9125dbbcbaea6f1169f
Malware Config
Extracted
C:\Users\Admin\Desktop\README.txt
https://computernewb.com/wiki/CollabVM
http://gg.gg/NOU2022
Extracted
C:\Users\Admin\Downloads\TraceOpen.txt
ryuk
Signatures
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Chaos
Ransomware family first seen in June 2021.
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Chaos Ransomware 6 IoCs
resource yara_rule behavioral1/memory/1260-54-0x0000000000C70000-0x0000000000CFE000-memory.dmp family_chaos behavioral1/memory/1260-55-0x0000000000C70000-0x0000000000CFE000-memory.dmp family_chaos behavioral1/files/0x000800000001225c-57.dat family_chaos behavioral1/files/0x000800000001225c-58.dat family_chaos behavioral1/memory/320-59-0x0000000000CF0000-0x0000000000D7E000-memory.dmp family_chaos behavioral1/memory/320-60-0x0000000000CF0000-0x0000000000D7E000-memory.dmp family_chaos -
Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
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Deletes shadow copies 2 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 524 bcdedit.exe 1260 bcdedit.exe -
pid Process 620 wbadmin.exe -
Executes dropped EXE 1 IoCs
pid Process 320 explorer.exe -
Modifies extensions of user files 5 IoCs
Ransomware generally changes the extension on encrypted files.
description ioc Process File renamed C:\Users\Admin\Pictures\ConvertFromRename.png => C:\Users\Admin\Pictures\ConvertFromRename.png.AZ explorer.exe File renamed C:\Users\Admin\Pictures\ConvertStop.raw => C:\Users\Admin\Pictures\ConvertStop.raw.AZ explorer.exe File renamed C:\Users\Admin\Pictures\DisconnectUpdate.raw => C:\Users\Admin\Pictures\DisconnectUpdate.raw.AZ explorer.exe File renamed C:\Users\Admin\Pictures\ProtectDeny.raw => C:\Users\Admin\Pictures\ProtectDeny.raw.AZ explorer.exe File renamed C:\Users\Admin\Pictures\UninstallExpand.tif => C:\Users\Admin\Pictures\UninstallExpand.tif.AZ explorer.exe -
Drops startup file 3 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\explorer.url explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini explorer.exe File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\README.txt explorer.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Drops desktop.ini file(s) 33 IoCs
description ioc Process File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Libraries\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Accessibility\Desktop.ini explorer.exe File opened for modification C:\Users\Public\Videos\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Music\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Documents\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\SendTo\Desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\desktop.ini explorer.exe File opened for modification C:\Users\Public\Documents\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Videos\desktop.ini explorer.exe File opened for modification C:\Users\Public\Videos\Sample Videos\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Searches\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\desktop.ini explorer.exe File opened for modification C:\Users\Public\Pictures\desktop.ini explorer.exe File opened for modification C:\Users\Public\Music\desktop.ini explorer.exe File opened for modification C:\Users\Public\Desktop\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Administrative Tools\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Maintenance\Desktop.ini explorer.exe File opened for modification C:\Users\Public\Pictures\Sample Pictures\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Favorites\Links for United States\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Desktop.ini explorer.exe File opened for modification C:\Users\Public\Music\Sample Music\desktop.ini explorer.exe File opened for modification C:\Users\Admin\Links\desktop.ini explorer.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\System Tools\Desktop.ini explorer.exe -
Sets desktop wallpaper using registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ddbjr6nhb.jpg" explorer.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 1488 vssadmin.exe -
Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_Classes\Local Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-3846991908-3261386348-1409841751-1000_CLASSES\Local Settings\Software\Microsoft\Windows\Shell\MuiCache rundll32.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 928 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 1 IoCs
pid Process 320 explorer.exe -
Suspicious behavior: EnumeratesProcesses 5 IoCs
pid Process 1260 AZ(DANGEROUS).exe 1260 AZ(DANGEROUS).exe 320 explorer.exe 320 explorer.exe 320 explorer.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 1260 AZ(DANGEROUS).exe Token: SeDebugPrivilege 320 explorer.exe Token: SeBackupPrivilege 1492 vssvc.exe Token: SeRestorePrivilege 1492 vssvc.exe Token: SeAuditPrivilege 1492 vssvc.exe Token: SeIncreaseQuotaPrivilege 1928 WMIC.exe Token: SeSecurityPrivilege 1928 WMIC.exe Token: SeTakeOwnershipPrivilege 1928 WMIC.exe Token: SeLoadDriverPrivilege 1928 WMIC.exe Token: SeSystemProfilePrivilege 1928 WMIC.exe Token: SeSystemtimePrivilege 1928 WMIC.exe Token: SeProfSingleProcessPrivilege 1928 WMIC.exe Token: SeIncBasePriorityPrivilege 1928 WMIC.exe Token: SeCreatePagefilePrivilege 1928 WMIC.exe Token: SeBackupPrivilege 1928 WMIC.exe Token: SeRestorePrivilege 1928 WMIC.exe Token: SeShutdownPrivilege 1928 WMIC.exe Token: SeDebugPrivilege 1928 WMIC.exe Token: SeSystemEnvironmentPrivilege 1928 WMIC.exe Token: SeRemoteShutdownPrivilege 1928 WMIC.exe Token: SeUndockPrivilege 1928 WMIC.exe Token: SeManageVolumePrivilege 1928 WMIC.exe Token: 33 1928 WMIC.exe Token: 34 1928 WMIC.exe Token: 35 1928 WMIC.exe Token: SeIncreaseQuotaPrivilege 1928 WMIC.exe Token: SeSecurityPrivilege 1928 WMIC.exe Token: SeTakeOwnershipPrivilege 1928 WMIC.exe Token: SeLoadDriverPrivilege 1928 WMIC.exe Token: SeSystemProfilePrivilege 1928 WMIC.exe Token: SeSystemtimePrivilege 1928 WMIC.exe Token: SeProfSingleProcessPrivilege 1928 WMIC.exe Token: SeIncBasePriorityPrivilege 1928 WMIC.exe Token: SeCreatePagefilePrivilege 1928 WMIC.exe Token: SeBackupPrivilege 1928 WMIC.exe Token: SeRestorePrivilege 1928 WMIC.exe Token: SeShutdownPrivilege 1928 WMIC.exe Token: SeDebugPrivilege 1928 WMIC.exe Token: SeSystemEnvironmentPrivilege 1928 WMIC.exe Token: SeRemoteShutdownPrivilege 1928 WMIC.exe Token: SeUndockPrivilege 1928 WMIC.exe Token: SeManageVolumePrivilege 1928 WMIC.exe Token: 33 1928 WMIC.exe Token: 34 1928 WMIC.exe Token: 35 1928 WMIC.exe Token: SeBackupPrivilege 1836 wbengine.exe Token: SeRestorePrivilege 1836 wbengine.exe Token: SeSecurityPrivilege 1836 wbengine.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
pid Process 928 NOTEPAD.EXE -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 1260 wrote to memory of 320 1260 AZ(DANGEROUS).exe 27 PID 1260 wrote to memory of 320 1260 AZ(DANGEROUS).exe 27 PID 1260 wrote to memory of 320 1260 AZ(DANGEROUS).exe 27 PID 320 wrote to memory of 1164 320 explorer.exe 29 PID 320 wrote to memory of 1164 320 explorer.exe 29 PID 320 wrote to memory of 1164 320 explorer.exe 29 PID 1164 wrote to memory of 1488 1164 cmd.exe 31 PID 1164 wrote to memory of 1488 1164 cmd.exe 31 PID 1164 wrote to memory of 1488 1164 cmd.exe 31 PID 1164 wrote to memory of 1928 1164 cmd.exe 36 PID 1164 wrote to memory of 1928 1164 cmd.exe 36 PID 1164 wrote to memory of 1928 1164 cmd.exe 36 PID 320 wrote to memory of 368 320 explorer.exe 38 PID 320 wrote to memory of 368 320 explorer.exe 38 PID 320 wrote to memory of 368 320 explorer.exe 38 PID 368 wrote to memory of 524 368 cmd.exe 40 PID 368 wrote to memory of 524 368 cmd.exe 40 PID 368 wrote to memory of 524 368 cmd.exe 40 PID 368 wrote to memory of 1260 368 cmd.exe 41 PID 368 wrote to memory of 1260 368 cmd.exe 41 PID 368 wrote to memory of 1260 368 cmd.exe 41 PID 320 wrote to memory of 672 320 explorer.exe 42 PID 320 wrote to memory of 672 320 explorer.exe 42 PID 320 wrote to memory of 672 320 explorer.exe 42 PID 672 wrote to memory of 620 672 cmd.exe 44 PID 672 wrote to memory of 620 672 cmd.exe 44 PID 672 wrote to memory of 620 672 cmd.exe 44 PID 320 wrote to memory of 928 320 explorer.exe 48 PID 320 wrote to memory of 928 320 explorer.exe 48 PID 320 wrote to memory of 928 320 explorer.exe 48
Processes
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C:\Users\Admin\AppData\Local\Temp\AZ(DANGEROUS).exe"C:\Users\Admin\AppData\Local\Temp\AZ(DANGEROUS).exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1260 -
C:\Users\Admin\AppData\Roaming\explorer.exe"C:\Users\Admin\AppData\Roaming\explorer.exe"2⤵
- Executes dropped EXE
- Modifies extensions of user files
- Drops startup file
- 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:320 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1164 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:1488
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:1928
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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:368 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:524
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1260
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:672 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:620
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\README.txt3⤵
- Opens file in notepad (likely ransom note)
- Suspicious use of FindShellTrayWindow
PID:928
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1492
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Windows Explorer.lnk.AZ1⤵
- Modifies registry class
PID:1548
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1836
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:1844
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:864