Analysis
- max time kernel
149s - max time network
150s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
22/05/2026, 22:50
General
- Target tmpyux_k6fs.exe
- Size 4.1MB
- Sample260522-2sb1daas51
- SHA256 cf9c0f38b6b3c2328cc3685b5d7e1dfe4d3d81ae221fee63605f951dc975b316
Malware Config
Signatures
- Family: Glupteba
Glupteba is a modular loader written in Golang with various components.
- Glupteba payload 22 IoCs
- Modifies Windows Firewall 2 TTPs 1 IoCs
- Executes dropped EXE 6 IoCs
- Adds Run key to start application 2 TTPs 2 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Manipulates WinMonFS driver. 1 IoCs
Roottkits write to WinMonFS to hide directories/files from being detected.
- Checks for VirtualBox DLLs, possible anti-VM trick 1 TTPs 1 IoCs
Certain files are specific to VirtualBox VMs and can be used to detect execution in a VM.
- Drops file in Windows directory 2 IoCs
- 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.
- Program crash 5 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 7 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- 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 64 IoCs
- Suspicious use of AdjustPrivilegeToken 7 IoCs
- Suspicious use of WriteProcessMemory 4 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\tmpyux_k6fs.exe"C:\Users\Admin\AppData\Local\Temp\tmpyux_k6fs.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\tmpyux_k6fs.exe"C:\Users\Admin\AppData\Local\Temp\tmpyux_k6fs.exe"2⤵
- Adds Run key to start application
- Checks for VirtualBox DLLs, possible anti-VM trick
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.exeC:\Windows\Sysnative\cmd.exe /C "netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="C:\Windows\rss\csrss.exe" enable=yes"3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\netsh.exenetsh advfirewall firewall add rule name="csrss" dir=in action=allow program="C:\Windows\rss\csrss.exe" enable=yes4⤵
- Modifies Windows Firewall
- Event Triggered Execution: Netsh Helper DLL
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C:\Windows\rss\csrss.exeC:\Windows\rss\csrss.exe3⤵
- Executes dropped EXE
- Adds Run key to start application
- Manipulates WinMonFS driver.
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exeschtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F4⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SYSTEM32\schtasks.exeschtasks /delete /tn ScheduledUpdate /f4⤵
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C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exeC:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe taskmgr.exe C:\Users\Admin\AppData\Local\Temp\csrss\injector\NtQuerySystemInformationHook.dll4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
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C:\Windows\SYSTEM32\schtasks.exeschtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F4⤵
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 4232 -s 6443⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4232 -ip 42321⤵
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C:\Windows\rss\csrss.exe"C:\Windows\rss\csrss.exe"1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\rss\csrss.exe"C:\Windows\rss\csrss.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5424 -s 8443⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 880 -s 8362⤵
- Program crash
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C:\Windows\rss\csrss.exeC:\Windows\rss\csrss.exe1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\rss\csrss.exe"C:\Windows\rss\csrss.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 5536 -s 8363⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2396 -s 6122⤵
- Program crash
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 880 -ip 8801⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2396 -ip 23961⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 5424 -ip 54241⤵
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 5536 -ip 55361⤵
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
1Windows Service
1Event Triggered Execution
1Netsh Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
1Windows Service
1Event Triggered Execution
1Netsh Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Defense Evasion
Impair Defenses
1Disable or Modify System Firewall
1Modify Registry
1Replay Monitor
Loading Replay Monitor...
Downloads
injector.exe
csrss.exe
memory/880-21-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/2396-26-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/3516-2-0x0000000002EF0000-0x0000000003767000-memory.dmp
memory/3516-3-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/3516-4-0x0000000002EF0000-0x0000000003767000-memory.dmp
memory/3516-1-0x0000000002B00000-0x0000000002EEB000-memory.dmp
memory/4040-36-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-35-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-43-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-42-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-30-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-31-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-32-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-33-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-34-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-41-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-40-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-37-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-38-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4040-39-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/4232-6-0x0000000002AA0000-0x0000000002E8D000-memory.dmp
memory/4232-11-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/5424-27-0x0000000000400000-0x0000000000C91000-memory.dmp
memory/5536-29-0x0000000000400000-0x0000000000C91000-memory.dmp