Analysis

  • max time kernel
    151s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/01/2024, 15:20

General

  • Target

    6fc52358b0e882de1fb890076f83172f.exe

  • Size

    4.4MB

  • MD5

    6fc52358b0e882de1fb890076f83172f

  • SHA1

    00fd67d3a87d10c0f8787cd580572c4cd1a7aaa8

  • SHA256

    8980c8abaa3365782c905b3f9506a032c54a5d1833fef1fe0ce46b6f84ee7534

  • SHA512

    f100a089063a9a65662cc863504ffd752a9bb245eae07b80a2dece2c8d19aa1d2b865bc950d134efc2775c23c923f8690785dce835df8f8174eb1654ef147990

  • SSDEEP

    98304:vnGiqTWRDnHhCwJsgkfTryDBzpf8pK5EQgotfPM7TkOtOZAK:rqTEH8wJsJTWVp0pVpIfUIAK

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 2 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\6fc52358b0e882de1fb890076f83172f.exe
    "C:\Users\Admin\AppData\Local\Temp\6fc52358b0e882de1fb890076f83172f.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:3872
    • C:\Users\Admin\AppData\Local\Temp\6fc52358b0e882de1fb890076f83172f.exe
      "C:\Users\Admin\AppData\Local\Temp\6fc52358b0e882de1fb890076f83172f.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:2784
      • 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:4168
        • 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:4140
      • C:\Windows\rss\csrss.exe
        C:\Windows\rss\csrss.exe /197-197
        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:2268
        • 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:3196
        • 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:1152
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3872 -s 656
      2⤵
      • Program crash
      PID:1180
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3872 -ip 3872
    1⤵
      PID:3180

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe

            Filesize

            281KB

            MD5

            d98e33b66343e7c96158444127a117f6

            SHA1

            bb716c5509a2bf345c6c1152f6e3e1452d39d50d

            SHA256

            5de4e2b07a26102fe527606ce5da1d5a4b938967c9d380a3c5fe86e2e34aaaf1

            SHA512

            705275e4a1ba8205eb799a8cf1737bc8ba686925e52c9198a6060a7abeee65552a85b814ac494a4b975d496a63be285f19a6265550585f2fc85824c42d7efab5

          • C:\Windows\rss\csrss.exe

            Filesize

            3.4MB

            MD5

            4cc220b907ed8c71cb7a68bd8fbe9c64

            SHA1

            68ce907c010c975ddede381f98da2f30fe5cb51b

            SHA256

            53f4e3d0fc9d9185854109a556593714b41d393472eb34777c4aab3762dd8763

            SHA512

            62db7824b53849a500c819263310e20760c2ba7a63758750749f579230b043277c44230be1df7af4dde09bd514504e29d1413d7b03b9c688f0a53453c2970937

          • C:\Windows\rss\csrss.exe

            Filesize

            2.6MB

            MD5

            a172baaad7378bcbb8554f246e236552

            SHA1

            957f6838cfc45f9239331a3ad56a79c5ece2850f

            SHA256

            6958be89b79577f7d02c107f1800a7d1d3fb6c88f6191a75c940d32e0d48c73e

            SHA512

            8884170d85c23f57b6fd2be680d86a077017e7d372305841364ba7add39a212036e8f8389c0e0e9d03c244f61768d55510ad1fdccb8cd602a97aa7da22aafd7c

          • memory/2268-34-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-35-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-40-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-39-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-38-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-37-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-36-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-33-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-32-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-21-0x0000000005400000-0x0000000005900000-memory.dmp

            Filesize

            5.0MB

          • memory/2268-22-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-23-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-31-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-29-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2268-30-0x0000000005400000-0x0000000005900000-memory.dmp

            Filesize

            5.0MB

          • memory/2784-19-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2784-6-0x0000000004F80000-0x00000000053C7000-memory.dmp

            Filesize

            4.3MB

          • memory/2784-14-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2784-8-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/2784-7-0x00000000053D0000-0x0000000005CF6000-memory.dmp

            Filesize

            9.1MB

          • memory/3872-2-0x00000000054A0000-0x0000000005DC6000-memory.dmp

            Filesize

            9.1MB

          • memory/3872-3-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/3872-1-0x0000000005060000-0x000000000549E000-memory.dmp

            Filesize

            4.2MB

          • memory/3872-4-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB

          • memory/3872-9-0x0000000000400000-0x00000000030F1000-memory.dmp

            Filesize

            44.9MB