Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231222-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/02/2024, 00:19

General

  • Target
    908a89a17743ee6a9317233913c3b0a2.exe
  • Size 4.4MB
  • Sample240205-amncnsgcck
  • SHA256 e7422002cf9d5ac396f1a082d9e3135bd8e1d1df56c38f5d685963b95e8eaab9
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • metasploit

Version
  • windows/single_exec

Signatures

  • Glupteba

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

  • Glupteba payload 21 IoCs
  • MetaSploit

    Detected malicious payload which is part of the Metasploit Framework, likely generated with msfvenom or similar.

  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 1 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.

  • Drops file in System32 directory 8 IoCs
  • 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
  • Program crash 2 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • GoLang User-Agent 3 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 64 IoCs
  • Modifies system certificate store 2 TTPs 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 9 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\908a89a17743ee6a9317233913c3b0a2.exe
    "C:\Users\Admin\AppData\Local\Temp\908a89a17743ee6a9317233913c3b0a2.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:1504
    • C:\Users\Admin\AppData\Local\Temp\908a89a17743ee6a9317233913c3b0a2.exe
      "C:\Users\Admin\AppData\Local\Temp\908a89a17743ee6a9317233913c3b0a2.exe"
      2⤵
      • Adds Run key to start application
      • Checks for VirtualBox DLLs, possible anti-VM trick
      • Drops file in Windows directory
      • Modifies data under HKEY_USERS
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1136
      • 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:2060
        • 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
          PID:3488
      • C:\Windows\rss\csrss.exe
        C:\Windows\rss\csrss.exe /94-94
        3⤵
        • Executes dropped EXE
        • Manipulates WinMonFS driver.
        • Drops file in System32 directory
        • Modifies data under HKEY_USERS
        • Modifies system certificate store
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2428
        • C:\Windows\SYSTEM32\schtasks.exe
          schtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F
          4⤵
          • Creates scheduled task(s)
          PID:3220
        • 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:4092
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1136 -s 844
        3⤵
        • Program crash
        PID:1112
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1504 -s 872
      2⤵
      • Program crash
      PID:1692
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1504 -ip 1504
    1⤵
      PID:4276
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1136 -ip 1136
      1⤵
        PID:4844

      Network

            MITRE ATT&CK Enterprise v15

            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

            csrss.exe

            • Path C:\Windows\rss\csrss.exe
            • Size 320KB
            • SHA256 ff69cdfe0b5ebfdfc435467e9ae7456e533e942be77c3cee12e3d3ef8c7f9e3f
            • MD5 SHA1 SHA512 SSDEEP

            csrss.exe

            • Path C:\Windows\rss\csrss.exe
            • Size 4.4MB
            • SHA256 e7422002cf9d5ac396f1a082d9e3135bd8e1d1df56c38f5d685963b95e8eaab9
            • MD5 SHA1 SHA512 SSDEEP

            memory/1136-12-0x0000000004DB0000-0x00000000051F9000-memory.dmp

            memory/1136-7-0x0000000004DB0000-0x00000000051F9000-memory.dmp

            memory/1136-8-0x0000000005200000-0x0000000005B26000-memory.dmp

            memory/1136-9-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/1136-10-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/1136-18-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/1504-6-0x00000000051B0000-0x0000000005AD6000-memory.dmp

            memory/1504-1-0x0000000004D60000-0x00000000051A2000-memory.dmp

            memory/1504-5-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/1504-3-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/1504-2-0x00000000051B0000-0x0000000005AD6000-memory.dmp

            memory/2428-20-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-39-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-19-0x0000000005200000-0x0000000005700000-memory.dmp

            memory/2428-35-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-36-0x0000000005200000-0x0000000005700000-memory.dmp

            memory/2428-37-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-38-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-29-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-40-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-41-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-42-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-43-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-44-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-45-0x0000000000400000-0x000000000309E000-memory.dmp

            memory/2428-46-0x0000000000400000-0x000000000309E000-memory.dmp