Analysis

  • max time kernel
    153s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/01/2024, 01:36

General

  • Target
    59758365b3f17652a7490c00185251a4.exe
  • Size 4.4MB
  • Sample240115-b1hvsafgh2
  • SHA256 e19fa7b03832671a0227d6ff3f65b585d180c2694a566abc2d0c735fabea4f21
  • 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 1 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 1 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\59758365b3f17652a7490c00185251a4.exe
    "C:\Users\Admin\AppData\Local\Temp\59758365b3f17652a7490c00185251a4.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:400
    • C:\Users\Admin\AppData\Local\Temp\59758365b3f17652a7490c00185251a4.exe
      "C:\Users\Admin\AppData\Local\Temp\59758365b3f17652a7490c00185251a4.exe"
      2⤵
      • Adds Run key to start application
      • Drops file in System32 directory
      • Checks for VirtualBox DLLs, possible anti-VM trick
      • Drops file in Windows directory
      • Modifies data under HKEY_USERS
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4880
      • 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:4600
        • 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:3928
      • C:\Windows\rss\csrss.exe
        C:\Windows\rss\csrss.exe /51-51
        3⤵
        • Executes dropped EXE
        • Manipulates WinMonFS driver.
        • Modifies data under HKEY_USERS
        • Modifies system certificate store
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4080
        • 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:4984
        • 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:4164
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 400 -s 780
      2⤵
      • Program crash
      PID:4644
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 400 -ip 400
    1⤵
      PID:3100

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          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 4.4MB
          • SHA256 e19fa7b03832671a0227d6ff3f65b585d180c2694a566abc2d0c735fabea4f21
          • MD5 SHA1 SHA512 SSDEEP

          memory/400-2-0x0000000002E60000-0x0000000003786000-memory.dmp

          memory/400-3-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/400-4-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/400-7-0x0000000002E60000-0x0000000003786000-memory.dmp

          memory/400-1-0x0000000002A20000-0x0000000002E5D000-memory.dmp

          memory/4080-33-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-31-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-41-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-21-0x0000000002E00000-0x0000000003300000-memory.dmp

          memory/4080-22-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-23-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-40-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-29-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-30-0x0000000002E00000-0x0000000003300000-memory.dmp

          memory/4080-39-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-32-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-38-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-34-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-35-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-36-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4080-37-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4880-8-0x0000000002B10000-0x0000000002F50000-memory.dmp

          memory/4880-14-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4880-9-0x0000000000400000-0x0000000000D41000-memory.dmp

          memory/4880-18-0x0000000000400000-0x0000000000D41000-memory.dmp