Analysis
- max time kernel
148s - max time network
147s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
10/09/2026, 08:29
General
- Target 2026-09-10_fc3bb07ac361b7ea4d7f98a95754d0b6_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
- Size 11.3MB
- Sample260910-kdlgtsaj61
- SHA256 585dfaf5bafa76c7a92eacfa434d263419b51256e62a9e00baea0cf506bbaf13
Malware Config
Extracted
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tofsee
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vanaheim.cn
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jotunheim.name
Signatures
- Family: Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
- Windows security bypass 2 TTPs 1 IoCs
- Modifies Windows Firewall 2 TTPs 1 IoCs
- Sets service image path in registry 3 TTPs 1 IoCs
This determines the executable launched when a service starts. It can be used to establish persistence.
- Creates new service(s) 2 TTPs
- Deletes itself 1 IoCs
- Executes dropped EXE 1 IoCs
- Suspicious use of SetThreadContext 1 IoCs
- Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.
- 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 2 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- Program crash 2 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 9 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious use of WriteProcessMemory 8 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\2026-09-10_fc3bb07ac361b7ea4d7f98a95754d0b6_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"C:\Users\Admin\AppData\Local\Temp\2026-09-10_fc3bb07ac361b7ea4d7f98a95754d0b6_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ntnlsqbj\2⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe" C:\Windows\SysWOW64\ntnlsqbj\2⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\sc.exe"C:\Windows\System32\sc.exe" create ntnlsqbj binPath= "C:\Windows\SysWOW64\ntnlsqbj\ybyrikeu.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-09-10_fc3bb07ac361b7ea4d7f98a95754d0b6_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe\"" type= own start= auto DisplayName= "wifi support"2⤵
- Launches sc.exe
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\sc.exe"C:\Windows\System32\sc.exe" description ntnlsqbj "wifi internet conection"2⤵
- Launches sc.exe
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\sc.exe"C:\Windows\System32\sc.exe" start ntnlsqbj2⤵
- Launches sc.exe
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\netsh.exe"C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul2⤵
- Modifies Windows Firewall
- Event Triggered Execution: Netsh Helper DLL
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2660 -s 10882⤵
- Program crash
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C:\Windows\SysWOW64\ntnlsqbj\ybyrikeu.exeC:\Windows\SysWOW64\ntnlsqbj\ybyrikeu.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-09-10_fc3bb07ac361b7ea4d7f98a95754d0b6_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\svchost.exesvchost.exe2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2784 -s 5922⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 2784 -ip 27841⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 2660 -ip 26601⤵
Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
1Windows Command Shell
1System Services
1Service Execution
1Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
3Windows Service
3Event Triggered Execution
1Netsh Helper DLL
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
3Windows Service
3Event Triggered Execution
1Netsh Helper DLL
1Defense Evasion
Impair Defenses
2Disable or Modify System Firewall
1Disable or Modify Tools
1Modify Registry
2Replay Monitor
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Downloads
ybyrikeu.exe
memory/2660-2-0x0000000002840000-0x0000000002853000-memory.dmp
memory/2660-1-0x0000000002900000-0x0000000002A00000-memory.dmp
memory/2660-11-0x0000000002840000-0x0000000002853000-memory.dmp
memory/3780-7-0x0000000000E80000-0x0000000000E95000-memory.dmp
memory/3780-12-0x0000000000E80000-0x0000000000E95000-memory.dmp
memory/3780-13-0x0000000000E80000-0x0000000000E95000-memory.dmp