Analysis
- max time kernel
150s - max time network
150s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
13/11/2026, 15:12
General
- Target Nireva.exe
- Size 613KB
- Sample261113-slc5esw15q
- SHA256 e478a60520a83a5d1421d5981f17305b2b246344f7f07094fa279b678be85db6
Malware Config
Signatures
- Family: Dracula, Samurai
Dracula aka Samurai is a stealer written in C#.
- Detects Dracula aka Samurai Stealer payload 1 IoCs
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
- Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
- Executes dropped EXE 5 IoCs
- Loads dropped DLL 10 IoCs
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Looks up external IP address via web service 1 TTPs 8 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Drops file in System32 directory 1 IoCs
- Drops file in Windows directory 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs
Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.
- Executes a command shell one-liner 1 TTPs 3 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- Reads the TCP/IP host and domain name from the registry 1 TTPs 12 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- System Network Configuration Discovery: Wi-Fi Discovery 1 TTPs 2 IoCs
Adversaries may search for information about Wi-Fi networks, such as network names and passwords, on compromised systems.
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 38 IoCs
- Suspicious use of AdjustPrivilegeToken 7 IoCs
- Suspicious use of WriteProcessMemory 10 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.
- outlook_office_path 1 IoCs
- outlook_win_path 1 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\Nireva.exe"C:\Users\Admin\AppData\Local\Temp\Nireva.exe"1⤵
- Modifies WinLogon for persistence
- Drops file in System32 directory
- Drops file in Windows directory
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\CMD.exe"CMD" netsh advfirewall firewall add rule name=".A?!(LR8(?ge(1" dir=in action=allow program="C:\Windows\System32\xdwdDefender.exe" enable=yes & exit2⤵
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C:\Windows\SYSTEM32\cmd.exe"cmd" /c schtasks /create /f /sc minute /mo 1 /tn "Microsoft\Windows\WAppCrashNvTew" /tr "C:\Windows\System32\xdwdDefender.exe" /RL HIGHEST & exit2⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc minute /mo 1 /tn "Microsoft\Windows\WAppCrashNvTew" /tr "C:\Windows\System32\xdwdDefender.exe" /RL HIGHEST3⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SYSTEM32\cmd.exe"cmd" /c schtasks /create /f /sc minute /mo 30 /tn "Microsoft\MachineCore" /tr "C:\Windows\Web\xdwdMalwareDef.exe" /RL HIGHEST & exit2⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc minute /mo 30 /tn "Microsoft\MachineCore" /tr "C:\Windows\Web\xdwdMalwareDef.exe" /RL HIGHEST3⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\System32\xdwdDefender.exe"C:\Windows\System32\xdwdDefender.exe"2⤵
- Executes dropped EXE
- Loads dropped DLL
- Accesses Microsoft Outlook profiles
- Reads the TCP/IP host and domain name from the registry
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- outlook_office_path
- outlook_win_path
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C:\Windows\System32\cmd.exe"cmd" /C chcp 65001 && netsh wlan show profiles | findstr All3⤵
- Executes a command shell one-liner
- System Network Configuration Discovery: Wi-Fi Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comchcp 650014⤵
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C:\Windows\system32\netsh.exenetsh wlan show profiles4⤵
- Loads dropped DLL
- Event Triggered Execution: Netsh Helper DLL
- System Network Configuration Discovery: Wi-Fi Discovery
- Suspicious behavior: EnumeratesProcesses
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C:\Windows\system32\findstr.exefindstr All4⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
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C:\Windows\Web\xdwdMalwareDef.exeC:\Windows\Web\xdwdMalwareDef.exe1⤵
- Executes dropped EXE
- Loads dropped DLL
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\xdwdDefender.exeC:\Windows\System32\xdwdDefender.exe1⤵
- Executes dropped EXE
- Loads dropped DLL
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\xdwdDefender.exe"C:\Windows\System32\xdwdDefender.exe"1⤵
- Executes dropped EXE
- Loads dropped DLL
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\xdwdDefender.exe"C:\Windows\System32\xdwdDefender.exe"1⤵
- Executes dropped EXE
- Loads dropped DLL
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
1Windows Command Shell
1Scheduled Task/Job
1Scheduled Task
1Persistence
Boot or Logon Autostart Execution
1Winlogon Helper DLL
1Event Triggered Execution
2AppInit DLLs
1Netsh Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Winlogon Helper DLL
1Event Triggered Execution
2AppInit DLLs
1Netsh 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
tmp5B37.tmp.dat
tmp5B3B.tmp.dat
xdwdDefender.exe
xdwd.dll
memory/2840-34-0x000000001CA80000-0x000000001CAD0000-memory.dmp
memory/2840-33-0x000000001C860000-0x000000001C88A000-memory.dmp
memory/3656-4-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-7-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-8-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-9-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-10-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-6-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-5-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-23-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-1-0x0000000000E40000-0x0000000000EDE000-memory.dmp
memory/3656-3-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-2-0x00007FF97B300000-0x00007FF97BCA4000-memory.dmp
memory/3656-0-0x00007FF97B48F000-0x00007FF97B490000-memory.dmp