Analysis
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max time kernel
150s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
24-12-2024 16:17
Behavioral task
behavioral1
Sample
bfg.scr
Resource
win10v2004-20241007-en
windows10-2004-x64
23 signatures
150 seconds
General
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Target
bfg.scr
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Size
659KB
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MD5
34a9decaa4864e2007b841e3b1263761
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SHA1
2b69dee1e3a261f75d55221e8117c8a4e044483b
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SHA256
bef2ef2eb5e55984a4a647e91058b4f2012eb75cfbf7c69cacb33ade7e7f74cd
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SHA512
5c0691f744e2bbeaecca32e5e4f10076ed291672acdb58f0658bd1baff28ac3aa9265fdeeef43c8c383ba4b77ef23560c22e7a2afc1b8a7c95edf4b0ccbcf2f8
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SSDEEP
12288:69HFJ9rJxRX1uVVjoaWSoynxdO1FVBaOiRZTERfIhNkNCCLo9Ek5C/hT:2Z1xuVVjfFoynPaVBUR8f+kN10EBd
Malware Config
Extracted
Family
darkcomet
Botnet
Guest1f63242m
C2
rose324-33082.portmap.host:33082
Mutex
DC_MUTEX-E28WFKY
Attributes
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InstallPath
MSDCSC\msdcsjc.exe
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gencode
Ee0E6MjQSS7Q
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install
true
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offline_keylogger
true
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persistence
true
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reg_key
reahltekaudio
Signatures
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Darkcomet family
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Modifies WinLogon for persistence 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\MSDCSC\\msdcsjc.exe" bfg.scr -
Modifies firewall policy service 3 TTPs 3 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile msdcsjc.exe Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "0" msdcsjc.exe Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\DisableNotifications = "0" msdcsjc.exe -
Modifies security service 2 TTPs 1 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "4" msdcsjc.exe -
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" msdcsjc.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" msdcsjc.exe -
Disables RegEdit via registry modification 1 IoCs
description ioc Process Set value (int) \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" msdcsjc.exe -
Disables Task Manager via registry modification
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Sets file to hidden 1 TTPs 2 IoCs
Modifies file attributes to stop it showing in Explorer etc.
pid Process 1692 attrib.exe 2060 attrib.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation bfg.scr -
Deletes itself 1 IoCs
pid Process 3136 notepad.exe -
Executes dropped EXE 1 IoCs
pid Process 3124 msdcsjc.exe -
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" msdcsjc.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" msdcsjc.exe -
Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\reahltekaudio = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\MSDCSC\\msdcsjc.exe" bfg.scr Set value (str) \REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\reahltekaudio = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\MSDCSC\\msdcsjc.exe" msdcsjc.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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System Location Discovery: System Language Discovery 1 TTPs 8 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language notepad.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language attrib.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language attrib.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language msdcsjc.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language notepad.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language bfg.scr -
Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\ bfg.scr -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 3124 msdcsjc.exe -
Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeIncreaseQuotaPrivilege 4236 bfg.scr Token: SeSecurityPrivilege 4236 bfg.scr Token: SeTakeOwnershipPrivilege 4236 bfg.scr Token: SeLoadDriverPrivilege 4236 bfg.scr Token: SeSystemProfilePrivilege 4236 bfg.scr Token: SeSystemtimePrivilege 4236 bfg.scr Token: SeProfSingleProcessPrivilege 4236 bfg.scr Token: SeIncBasePriorityPrivilege 4236 bfg.scr Token: SeCreatePagefilePrivilege 4236 bfg.scr Token: SeBackupPrivilege 4236 bfg.scr Token: SeRestorePrivilege 4236 bfg.scr Token: SeShutdownPrivilege 4236 bfg.scr Token: SeDebugPrivilege 4236 bfg.scr Token: SeSystemEnvironmentPrivilege 4236 bfg.scr Token: SeChangeNotifyPrivilege 4236 bfg.scr Token: SeRemoteShutdownPrivilege 4236 bfg.scr Token: SeUndockPrivilege 4236 bfg.scr Token: SeManageVolumePrivilege 4236 bfg.scr Token: SeImpersonatePrivilege 4236 bfg.scr Token: SeCreateGlobalPrivilege 4236 bfg.scr Token: 33 4236 bfg.scr Token: 34 4236 bfg.scr Token: 35 4236 bfg.scr Token: 36 4236 bfg.scr Token: SeIncreaseQuotaPrivilege 3124 msdcsjc.exe Token: SeSecurityPrivilege 3124 msdcsjc.exe Token: SeTakeOwnershipPrivilege 3124 msdcsjc.exe Token: SeLoadDriverPrivilege 3124 msdcsjc.exe Token: SeSystemProfilePrivilege 3124 msdcsjc.exe Token: SeSystemtimePrivilege 3124 msdcsjc.exe Token: SeProfSingleProcessPrivilege 3124 msdcsjc.exe Token: SeIncBasePriorityPrivilege 3124 msdcsjc.exe Token: SeCreatePagefilePrivilege 3124 msdcsjc.exe Token: SeBackupPrivilege 3124 msdcsjc.exe Token: SeRestorePrivilege 3124 msdcsjc.exe Token: SeShutdownPrivilege 3124 msdcsjc.exe Token: SeDebugPrivilege 3124 msdcsjc.exe Token: SeSystemEnvironmentPrivilege 3124 msdcsjc.exe Token: SeChangeNotifyPrivilege 3124 msdcsjc.exe Token: SeRemoteShutdownPrivilege 3124 msdcsjc.exe Token: SeUndockPrivilege 3124 msdcsjc.exe Token: SeManageVolumePrivilege 3124 msdcsjc.exe Token: SeImpersonatePrivilege 3124 msdcsjc.exe Token: SeCreateGlobalPrivilege 3124 msdcsjc.exe Token: 33 3124 msdcsjc.exe Token: 34 3124 msdcsjc.exe Token: 35 3124 msdcsjc.exe Token: 36 3124 msdcsjc.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 3124 msdcsjc.exe -
Suspicious use of WriteProcessMemory 59 IoCs
description pid Process procid_target PID 4236 wrote to memory of 436 4236 bfg.scr 83 PID 4236 wrote to memory of 436 4236 bfg.scr 83 PID 4236 wrote to memory of 436 4236 bfg.scr 83 PID 4236 wrote to memory of 4852 4236 bfg.scr 85 PID 4236 wrote to memory of 4852 4236 bfg.scr 85 PID 4236 wrote to memory of 4852 4236 bfg.scr 85 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 4236 wrote to memory of 3136 4236 bfg.scr 86 PID 436 wrote to memory of 1692 436 cmd.exe 88 PID 436 wrote to memory of 1692 436 cmd.exe 88 PID 436 wrote to memory of 1692 436 cmd.exe 88 PID 4852 wrote to memory of 2060 4852 cmd.exe 89 PID 4852 wrote to memory of 2060 4852 cmd.exe 89 PID 4852 wrote to memory of 2060 4852 cmd.exe 89 PID 4236 wrote to memory of 3124 4236 bfg.scr 90 PID 4236 wrote to memory of 3124 4236 bfg.scr 90 PID 4236 wrote to memory of 3124 4236 bfg.scr 90 PID 3124 wrote to memory of 4300 3124 msdcsjc.exe 91 PID 3124 wrote to memory of 4300 3124 msdcsjc.exe 91 PID 3124 wrote to memory of 4300 3124 msdcsjc.exe 91 PID 3124 wrote to memory of 3368 3124 msdcsjc.exe 92 PID 3124 wrote to memory of 3368 3124 msdcsjc.exe 92 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 PID 3124 wrote to memory of 1616 3124 msdcsjc.exe 93 -
System policy modification 1 TTPs 3 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion msdcsjc.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern msdcsjc.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern\NoControlPanel = "1" msdcsjc.exe -
Views/modifies file attributes 1 TTPs 2 IoCs
pid Process 1692 attrib.exe 2060 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\bfg.scr"C:\Users\Admin\AppData\Local\Temp\bfg.scr" /S1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4236 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\bfg.scr" +s +h2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:436 -
C:\Windows\SysWOW64\attrib.exeattrib "C:\Users\Admin\AppData\Local\Temp\bfg.scr" +s +h3⤵
- Sets file to hidden
- System Location Discovery: System Language Discovery
- Views/modifies file attributes
PID:1692
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4852 -
C:\Windows\SysWOW64\attrib.exeattrib "C:\Users\Admin\AppData\Local\Temp" +s +h3⤵
- Sets file to hidden
- System Location Discovery: System Language Discovery
- Views/modifies file attributes
PID:2060
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C:\Windows\SysWOW64\notepad.exenotepad2⤵
- Deletes itself
- System Location Discovery: System Language Discovery
PID:3136
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C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsjc.exe"C:\ProgramData\Microsoft\Windows\Start Menu\Programs\MSDCSC\msdcsjc.exe"2⤵
- Modifies firewall policy service
- Modifies security service
- Windows security bypass
- Disables RegEdit via registry modification
- Executes dropped EXE
- Windows security modification
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3124 -
C:\Program Files (x86)\Internet Explorer\iexplore.exe"C:\Program Files (x86)\Internet Explorer\iexplore.exe"3⤵PID:4300
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C:\Windows\explorer.exe"C:\Windows\explorer.exe"3⤵PID:3368
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C:\Windows\SysWOW64\notepad.exenotepad3⤵
- System Location Discovery: System Language Discovery
PID:1616
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Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
2Windows Service
2Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
2Windows Service
2Defense Evasion
Hide Artifacts
2Hidden Files and Directories
2Impair Defenses
3Disable or Modify System Firewall
1Disable or Modify Tools
2Modify Registry
7Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
659KB
MD534a9decaa4864e2007b841e3b1263761
SHA12b69dee1e3a261f75d55221e8117c8a4e044483b
SHA256bef2ef2eb5e55984a4a647e91058b4f2012eb75cfbf7c69cacb33ade7e7f74cd
SHA5125c0691f744e2bbeaecca32e5e4f10076ed291672acdb58f0658bd1baff28ac3aa9265fdeeef43c8c383ba4b77ef23560c22e7a2afc1b8a7c95edf4b0ccbcf2f8