Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260513-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260513-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    22/05/2026, 22:50

General

  • Target
    tmpyux_k6fs.exe
  • Size 4.1MB
  • Sample260522-2sb1daas51
  • SHA256 cf9c0f38b6b3c2328cc3685b5d7e1dfe4d3d81ae221fee63605f951dc975b316
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: Glupteba

    Glupteba is a modular loader written in Golang with various components.

  • Glupteba payload 22 IoCs
  • Windows security bypass 2 TTPs 7 IoCs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Executes dropped EXE 6 IoCs
  • Windows security modification 2 TTPs 7 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

  • 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
    PID:644
    • C:\Users\Admin\AppData\Local\Temp\tmpyux_k6fs.exe
      "C:\Users\Admin\AppData\Local\Temp\tmpyux_k6fs.exe"
      2⤵
      • Windows security bypass
      • Windows security modification
      • 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
      PID:1028
      • C:\Windows\system32\cmd.exe
        C:\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
        PID:3564
        • C:\Windows\system32\netsh.exe
          netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="C:\Windows\rss\csrss.exe" enable=yes
          4⤵
          • Modifies Windows Firewall
          • Event Triggered Execution: Netsh Helper DLL
          PID:976
      • C:\Windows\rss\csrss.exe
        C:\Windows\rss\csrss.exe
        3⤵
        • 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
        PID:1296
        • C:\Windows\SYSTEM32\schtasks.exe
          schtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F
          4⤵
          • Scheduled Task/Job: Scheduled Task
          PID:448
        • C:\Windows\SYSTEM32\schtasks.exe
          schtasks /delete /tn ScheduledUpdate /f
          4⤵
            PID:2328
          • C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe
            C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe taskmgr.exe C:\Users\Admin\AppData\Local\Temp\csrss\injector\NtQuerySystemInformationHook.dll
            4⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            PID:1408
          • C:\Windows\SYSTEM32\schtasks.exe
            schtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F
            4⤵
            • Scheduled Task/Job: Scheduled Task
            PID:4240
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1028 -s 748
          3⤵
          • Program crash
          PID:4500
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1028 -ip 1028
      1⤵
        PID:4700
      • 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
        PID:4084
        • C:\Windows\rss\csrss.exe
          "C:\Windows\rss\csrss.exe"
          2⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2808
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2808 -s 836
            3⤵
            • Program crash
            PID:1208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4084 -s 836
          2⤵
          • Program crash
          PID:3116
      • 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
        PID:2144
        • C:\Windows\rss\csrss.exe
          "C:\Windows\rss\csrss.exe"
          2⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2332
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2332 -s 728
            3⤵
            • Program crash
            PID:2124
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2144 -s 724
          2⤵
          • Program crash
          PID:564
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4084 -ip 4084
        1⤵
          PID:2820
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2144 -ip 2144
          1⤵
            PID:3088
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 576 -p 2808 -ip 2808
            1⤵
              PID:1052
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 584 -p 2332 -ip 2332
              1⤵
                PID:4104

              Network

                    MITRE ATT&CK Enterprise v16

                    Replay Monitor

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                    Downloads

                    injector.exe

                    • Path C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe
                    • Size 281KB
                    • SHA256 5de4e2b07a26102fe527606ce5da1d5a4b938967c9d380a3c5fe86e2e34aaaf1
                    • MD5 SHA1 SHA512 SSDEEP TLSH

                    csrss.exe

                    • Path C:\Windows\rss\csrss.exe
                    • Size 4.1MB
                    • SHA256 cf9c0f38b6b3c2328cc3685b5d7e1dfe4d3d81ae221fee63605f951dc975b316
                    • MD5 SHA1 SHA512 SSDEEP TLSH

                    memory/644-1-0x00000000029F0000-0x0000000002DE4000-memory.dmp

                    memory/644-2-0x0000000002DF0000-0x0000000003667000-memory.dmp

                    memory/644-3-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/644-4-0x0000000002DF0000-0x0000000003667000-memory.dmp

                    memory/1028-6-0x0000000002AD0000-0x0000000002EBE000-memory.dmp

                    memory/1028-11-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-30-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-35-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-43-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-42-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-41-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-31-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-32-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-33-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-34-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-40-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-36-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-37-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-38-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/1296-39-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/2144-26-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/2332-29-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/2808-27-0x0000000000400000-0x0000000000C91000-memory.dmp

                    memory/4084-23-0x0000000000400000-0x0000000000C91000-memory.dmp