Analysis
- max time kernel
148s - max time network
149s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
25/08/2026, 20:20
General
- Target 1bd88bbb0c82349303aa60c470c8b51e.exe
- Size 3.3MB
- Sample260825-y4mdpsej8s
- SHA256 fd669e1388907d25b8039b5ae22804a6b77a96d139c8f8bbff50c15c9968bfa2
Malware Config
Signatures
- Family: DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- DCRat payload 2 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
- Modifies WinLogon for persistence 2 TTPs 2 IoCs
- Process spawned unexpected child process 6 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
- Executes dropped EXE 3 IoCs
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Adds Run key to start application 2 TTPs 4 IoCs
- Looks up external IP address via web service 1 TTPs 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Executes a VBScript file via the Windows Script Host. 1 TTPs 4 IoCs
- SmartAssembly .NET packer 2 IoCs
Detects SmartAssembly .NET packer.
- Drops file in Program Files directory 4 IoCs
- Browser Information Discovery 1 TTPs
Enumerate browser information.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Modifies registry class 2 IoCs
- Scheduled Task/Job: Scheduled Task 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 41 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of WriteProcessMemory 7 IoCs
- 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.
Processes
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C:\Users\Admin\AppData\Local\Temp\1bd88bbb0c82349303aa60c470c8b51e.exe"C:\Users\Admin\AppData\Local\Temp\1bd88bbb0c82349303aa60c470c8b51e.exe"1⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\componentCrt\THHWhms9TZgZMSefpqs.vbe"2⤵
- Executes a VBScript file via the Windows Script Host.
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\componentCrt\zbttcnORVsS46.bat" "3⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\componentCrt\blockRefPerf.exe"C:\componentCrt\blockRefPerf.exe"4⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\blockRefPerf.exe"C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\blockRefPerf.exe"5⤵
- Executes dropped EXE
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\1a3b7e12-3af7-4431-920e-fb773c59ef54.vbs"6⤵
- Executes a VBScript file via the Windows Script Host.
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C:\Windows\System32\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\9644b1a5-5da4-44ff-89d8-c780bb0e57e0.vbs"6⤵
- Executes a VBScript file via the Windows Script Host.
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C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\componentCrt\file.vbs"2⤵
- Executes a VBScript file via the Windows Script Host.
- System Location Discovery: System Language Discovery
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "blockRefPerfb" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\blockRefPerf.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "blockRefPerf" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\blockRefPerf.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "blockRefPerfb" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Sidebar\Shared Gadgets\blockRefPerf.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\fontdrvhost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\fontdrvhost.exe"C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\fontdrvhost.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\wbem\WmiApSrv.exeC:\Windows\system32\wbem\WmiApSrv.exe1⤵
Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
2Visual Basic
1Windows Command Shell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
Loading Replay Monitor...
Downloads
1a3b7e12-3af7-4431-920e-fb773c59ef54.vbs
9644b1a5-5da4-44ff-89d8-c780bb0e57e0.vbs
THHWhms9TZgZMSefpqs.vbe
blockRefPerf.exe
file.vbs
zbttcnORVsS46.bat
memory/4812-36-0x000000001C810000-0x000000001C81C000-memory.dmp
memory/4812-39-0x000000001CD90000-0x000000001D2B8000-memory.dmp
memory/4812-27-0x0000000003550000-0x0000000003558000-memory.dmp
memory/4812-29-0x0000000003580000-0x0000000003588000-memory.dmp
memory/4812-30-0x0000000003590000-0x00000000035A2000-memory.dmp
memory/4812-28-0x0000000003560000-0x0000000003576000-memory.dmp
memory/4812-26-0x000000001C4A0000-0x000000001C4F0000-memory.dmp
memory/4812-31-0x000000001C7A0000-0x000000001C7AC000-memory.dmp
memory/4812-32-0x000000001BE70000-0x000000001BE78000-memory.dmp
memory/4812-33-0x000000001BE80000-0x000000001BE90000-memory.dmp
memory/4812-34-0x000000001C7B0000-0x000000001C806000-memory.dmp
memory/4812-35-0x000000001C800000-0x000000001C80C000-memory.dmp
memory/4812-24-0x0000000003400000-0x0000000003408000-memory.dmp
memory/4812-37-0x000000001C820000-0x000000001C828000-memory.dmp
memory/4812-38-0x000000001C830000-0x000000001C842000-memory.dmp
memory/4812-25-0x0000000003410000-0x000000000342C000-memory.dmp
memory/4812-42-0x000000001C880000-0x000000001C88C000-memory.dmp
memory/4812-41-0x000000001C870000-0x000000001C878000-memory.dmp
memory/4812-40-0x000000001C860000-0x000000001C868000-memory.dmp
memory/4812-46-0x000000001C8C0000-0x000000001C8CE000-memory.dmp
memory/4812-45-0x000000001C8B0000-0x000000001C8BE000-memory.dmp
memory/4812-44-0x000000001C8A0000-0x000000001C8AA000-memory.dmp
memory/4812-43-0x000000001C890000-0x000000001C89C000-memory.dmp
memory/4812-48-0x000000001C8E0000-0x000000001C8EC000-memory.dmp
memory/4812-47-0x000000001C8D0000-0x000000001C8D8000-memory.dmp
memory/4812-22-0x0000000000E20000-0x000000000111A000-memory.dmp
memory/4812-23-0x0000000001990000-0x000000000199E000-memory.dmp
memory/5652-54-0x00000000030B0000-0x00000000030C2000-memory.dmp
memory/5652-53-0x0000000003000000-0x0000000003012000-memory.dmp
memory/5652-69-0x000000001E150000-0x000000001E312000-memory.dmp