Analysis
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max time kernel
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max time network
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platform
windows7_x64 -
resource
win7-20241010-en -
resource tags
arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system -
submitted
15-12-2024 12:48
Behavioral task
behavioral1
Sample
FnClient.exe
Resource
win7-20241010-en
Behavioral task
behavioral2
Sample
FnClient.exe
Resource
win10v2004-20241007-en
General
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Target
FnClient.exe
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Size
1.6MB
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MD5
794aff3545f0ea50584adc40dd2f0896
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SHA1
6130d56bf9ba1cbe320f0b24141b0c9491584d3f
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SHA256
18888fdc50df5f29587b1c83cb5a217d4837f5fb31b74b010e2337de4b5da988
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SHA512
d7d9ca25f7535f10232b715ef5662f7316c512dc7da1036d3a31e77922fcaa30e5066fcf7142c743147e2d9aebdbf778be0390512a6f397c692118d7f11f1239
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SSDEEP
12288:ofUX9SOQjN9wr5jpvkP3bap3WUkv9wO4ngeA4EoELzXKlfGba5hvMNGcxzY5Sqax:hAbIfIgJGRg85sPDr/VkJ4UB
Malware Config
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/1740-1-0x00000000013C0000-0x0000000001556000-memory.dmp family_chaos behavioral1/files/0x000e000000012267-5.dat family_chaos behavioral1/memory/2620-7-0x0000000000AE0000-0x0000000000C76000-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 864 bcdedit.exe 1192 bcdedit.exe -
pid Process 1556 wbadmin.exe -
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 2620 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) 34 IoCs
description ioc Process File opened for modification C:\Users\Admin\Documents\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\Public\Music\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\Public\Music\Sample Music\desktop.ini svchost.exe File opened for modification F:\$RECYCLE.BIN\S-1-5-21-3692679935-4019334568-335155002-1000\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Contacts\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\Roaming\Microsoft\Windows\Start Menu\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Videos\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\Public\Videos\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\Public\Documents\desktop.ini svchost.exe 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\Accessories\Accessibility\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\Pictures\Sample Pictures\desktop.ini svchost.exe File opened for modification C:\Users\Public\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Links\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\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\Start Menu\Programs\Administrative Tools\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Music\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\Roaming\Microsoft\Windows\SendTo\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\Downloads\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini svchost.exe File opened for modification C:\Users\Admin\Searches\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\Public\Pictures\desktop.ini svchost.exe -
Sets desktop wallpaper using registry 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\curzm2ewu.jpg" svchost.exe Set value (str) \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\Pictures\\My Wallpaper.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 2976 vssadmin.exe -
Modifies registry class 6 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-3692679935-4019334568-335155002-1000_Classes\Local Settings rundll32.exe -
Opens file in notepad (likely ransom note) 1 IoCs
pid Process 2112 NOTEPAD.EXE -
Suspicious behavior: AddClipboardFormatListener 2 IoCs
pid Process 2620 svchost.exe 2884 vlc.exe -
Suspicious behavior: EnumeratesProcesses 7 IoCs
pid Process 1740 FnClient.exe 1740 FnClient.exe 1740 FnClient.exe 2620 svchost.exe 2620 svchost.exe 2620 svchost.exe 2620 svchost.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 2884 vlc.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeDebugPrivilege 1740 FnClient.exe Token: SeDebugPrivilege 2620 svchost.exe Token: SeBackupPrivilege 1312 vssvc.exe Token: SeRestorePrivilege 1312 vssvc.exe Token: SeAuditPrivilege 1312 vssvc.exe Token: SeIncreaseQuotaPrivilege 992 WMIC.exe Token: SeSecurityPrivilege 992 WMIC.exe Token: SeTakeOwnershipPrivilege 992 WMIC.exe Token: SeLoadDriverPrivilege 992 WMIC.exe Token: SeSystemProfilePrivilege 992 WMIC.exe Token: SeSystemtimePrivilege 992 WMIC.exe Token: SeProfSingleProcessPrivilege 992 WMIC.exe Token: SeIncBasePriorityPrivilege 992 WMIC.exe Token: SeCreatePagefilePrivilege 992 WMIC.exe Token: SeBackupPrivilege 992 WMIC.exe Token: SeRestorePrivilege 992 WMIC.exe Token: SeShutdownPrivilege 992 WMIC.exe Token: SeDebugPrivilege 992 WMIC.exe Token: SeSystemEnvironmentPrivilege 992 WMIC.exe Token: SeRemoteShutdownPrivilege 992 WMIC.exe Token: SeUndockPrivilege 992 WMIC.exe Token: SeManageVolumePrivilege 992 WMIC.exe Token: 33 992 WMIC.exe Token: 34 992 WMIC.exe Token: 35 992 WMIC.exe Token: SeIncreaseQuotaPrivilege 992 WMIC.exe Token: SeSecurityPrivilege 992 WMIC.exe Token: SeTakeOwnershipPrivilege 992 WMIC.exe Token: SeLoadDriverPrivilege 992 WMIC.exe Token: SeSystemProfilePrivilege 992 WMIC.exe Token: SeSystemtimePrivilege 992 WMIC.exe Token: SeProfSingleProcessPrivilege 992 WMIC.exe Token: SeIncBasePriorityPrivilege 992 WMIC.exe Token: SeCreatePagefilePrivilege 992 WMIC.exe Token: SeBackupPrivilege 992 WMIC.exe Token: SeRestorePrivilege 992 WMIC.exe Token: SeShutdownPrivilege 992 WMIC.exe Token: SeDebugPrivilege 992 WMIC.exe Token: SeSystemEnvironmentPrivilege 992 WMIC.exe Token: SeRemoteShutdownPrivilege 992 WMIC.exe Token: SeUndockPrivilege 992 WMIC.exe Token: SeManageVolumePrivilege 992 WMIC.exe Token: 33 992 WMIC.exe Token: 34 992 WMIC.exe Token: 35 992 WMIC.exe Token: SeBackupPrivilege 2540 wbengine.exe Token: SeRestorePrivilege 2540 wbengine.exe Token: SeSecurityPrivilege 2540 wbengine.exe -
Suspicious use of FindShellTrayWindow 5 IoCs
pid Process 2112 NOTEPAD.EXE 2884 vlc.exe 2884 vlc.exe 2884 vlc.exe 2884 vlc.exe -
Suspicious use of SendNotifyMessage 3 IoCs
pid Process 2884 vlc.exe 2884 vlc.exe 2884 vlc.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 2884 vlc.exe -
Suspicious use of WriteProcessMemory 30 IoCs
description pid Process procid_target PID 1740 wrote to memory of 2620 1740 FnClient.exe 30 PID 1740 wrote to memory of 2620 1740 FnClient.exe 30 PID 1740 wrote to memory of 2620 1740 FnClient.exe 30 PID 2620 wrote to memory of 1764 2620 svchost.exe 34 PID 2620 wrote to memory of 1764 2620 svchost.exe 34 PID 2620 wrote to memory of 1764 2620 svchost.exe 34 PID 1764 wrote to memory of 2976 1764 cmd.exe 36 PID 1764 wrote to memory of 2976 1764 cmd.exe 36 PID 1764 wrote to memory of 2976 1764 cmd.exe 36 PID 1764 wrote to memory of 992 1764 cmd.exe 40 PID 1764 wrote to memory of 992 1764 cmd.exe 40 PID 1764 wrote to memory of 992 1764 cmd.exe 40 PID 2620 wrote to memory of 2088 2620 svchost.exe 42 PID 2620 wrote to memory of 2088 2620 svchost.exe 42 PID 2620 wrote to memory of 2088 2620 svchost.exe 42 PID 2088 wrote to memory of 864 2088 cmd.exe 44 PID 2088 wrote to memory of 864 2088 cmd.exe 44 PID 2088 wrote to memory of 864 2088 cmd.exe 44 PID 2088 wrote to memory of 1192 2088 cmd.exe 45 PID 2088 wrote to memory of 1192 2088 cmd.exe 45 PID 2088 wrote to memory of 1192 2088 cmd.exe 45 PID 2620 wrote to memory of 1884 2620 svchost.exe 46 PID 2620 wrote to memory of 1884 2620 svchost.exe 46 PID 2620 wrote to memory of 1884 2620 svchost.exe 46 PID 1884 wrote to memory of 1556 1884 cmd.exe 48 PID 1884 wrote to memory of 1556 1884 cmd.exe 48 PID 1884 wrote to memory of 1556 1884 cmd.exe 48 PID 2620 wrote to memory of 2112 2620 svchost.exe 52 PID 2620 wrote to memory of 2112 2620 svchost.exe 52 PID 2620 wrote to memory of 2112 2620 svchost.exe 52 -
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\FnClient.exe"C:\Users\Admin\AppData\Local\Temp\FnClient.exe"1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1740 -
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:2620 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
PID:1764 -
C:\Windows\system32\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
PID:2976
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C:\Windows\System32\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
PID:992
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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:2088 -
C:\Windows\system32\bcdedit.exebcdedit /set {default} bootstatuspolicy ignoreallfailures4⤵
- Modifies boot configuration data using bcdedit
PID:864
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C:\Windows\system32\bcdedit.exebcdedit /set {default} recoveryenabled no4⤵
- Modifies boot configuration data using bcdedit
PID:1192
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
- Suspicious use of WriteProcessMemory
PID:1884 -
C:\Windows\system32\wbadmin.exewbadmin delete catalog -quiet4⤵
- Deletes backup catalog
PID:1556
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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:2112
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,OpenAs_RunDLL C:\Users\Admin\Desktop\UnlockResolve.vbs.8kp71⤵
- Modifies registry class
PID:2892
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1312
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C:\Windows\system32\wbengine.exe"C:\Windows\system32\wbengine.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2540
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C:\Windows\System32\vdsldr.exeC:\Windows\System32\vdsldr.exe -Embedding1⤵PID:2564
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C:\Windows\System32\vds.exeC:\Windows\System32\vds.exe1⤵PID:2520
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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\Internet Explorer.lnk.e4ut1⤵
- Modifies registry class
PID:1576
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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\Internet Explorer.lnk.e4ut1⤵
- Modifies registry class
PID:2240
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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.a36j1⤵
- Modifies registry class
PID:2324
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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 Media Player.lnk.hjd61⤵
- Modifies registry class
PID:2076
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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\Google Chrome.lnk.ihsd1⤵
- Modifies registry class
PID:1384
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C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" shell32.dll,Options_RunDLL 71⤵PID:2228
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C:\Program Files\VideoLAN\VLC\vlc.exe"C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Desktop\LockUpdate.TS"1⤵
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
PID:2884
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
1.6MB
MD5794aff3545f0ea50584adc40dd2f0896
SHA16130d56bf9ba1cbe320f0b24141b0c9491584d3f
SHA25618888fdc50df5f29587b1c83cb5a217d4837f5fb31b74b010e2337de4b5da988
SHA512d7d9ca25f7535f10232b715ef5662f7316c512dc7da1036d3a31e77922fcaa30e5066fcf7142c743147e2d9aebdbf778be0390512a6f397c692118d7f11f1239
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Filesize
785B
MD5d1bda10d6a8783f5d72eb4f2ac35abf8
SHA1b9ae3b5f6c9082d66df9cfb07565a65820b2699a
SHA2566a2196d66cd38e04d7699c2899dc60260e77c72faf009e8d6f2ba02b98df48af
SHA512b860296368b255973c9aeaee652bfc3a3691aaacb4ed38623dc3f3453343d08de7a2eda44621684e35ef31a424fda6719c652a6fb378258764cacae53cb63a2d