Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-02-2024 08:58

General

  • Target

    app.exe

  • Size

    4.4MB

  • MD5

    ac5d54f7823c2dcfc4ae1c84c1b35c5f

  • SHA1

    e45ff6c476b2b4710e1ec0ed4f85b1925599db6d

  • SHA256

    911b4f2268a203dccaf0912403d08865f21b3299c9d7f6d166c7e90fe6a4be5f

  • SHA512

    b5be2516e9971bf274e8314d5959dc65d22beb5d69ffcb36c92bf9ff3623b6ebf75d0963b5b73ab8a08512cbdebee78ff090967b21932dbe7d9d62480023fa84

  • SSDEEP

    98304:ZcsOAtco1SVicHAeEYyjBKKjG8u5KPEIsIlZaC:NntcoYVic419u5EsOt

Malware Config

Extracted

Family

metasploit

Version

windows/single_exec

Signatures

  • Glupteba

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

  • Glupteba payload 22 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
  • 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 4 IoCs

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

  • Modifies data under HKEY_USERS 64 IoCs
  • Modifies system certificate store 2 TTPs 8 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\app.exe
    "C:\Users\Admin\AppData\Local\Temp\app.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:4960
    • C:\Users\Admin\AppData\Local\Temp\app.exe
      "C:\Users\Admin\AppData\Local\Temp\app.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:1668
      • 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:920
        • 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:4716
      • C:\Windows\rss\csrss.exe
        C:\Windows\rss\csrss.exe ""
        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:5080
        • 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:4540
        • 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:3512

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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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

    1016KB

    MD5

    afab78794887199d24ff2c6995678783

    SHA1

    e8fd89669f121e5718d3985df8fdeeeadad2095c

    SHA256

    43bea16ab5db56ab8773a56a3b39f1dd8aa689647c02de914bb66bc50b10de42

    SHA512

    e321f07e717d303f949bb24161bd46c82f8e13882eb82d69fe6682125b830333b4be3360b1518e46cafd2c9d2c49b5bd5bb6739e3ecbbe46455492d9fd211c80

  • C:\Windows\rss\csrss.exe

    Filesize

    661KB

    MD5

    1b7d338e25bdb595ef6ae4363df92217

    SHA1

    771b4986021d71ac86a08009b39b83bc5642b1b8

    SHA256

    e34e6666816062551764ba88576d26942e2215037d8f2e0a016c18d4ec4a5784

    SHA512

    260aef3b5f713f75500afcb0dbb7256f3c35014090ff4ee1acf685d9959a4c4de7c89557a45100e7c95569e672ce4bd787ebf3d12ecaaf70d58618149e8bcb4d

  • memory/1668-9-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/1668-7-0x0000000001170000-0x00000000015B7000-memory.dmp

    Filesize

    4.3MB

  • memory/1668-8-0x00000000015C0000-0x0000000001EE6000-memory.dmp

    Filesize

    9.1MB

  • memory/1668-18-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/4960-2-0x0000000001520000-0x0000000001E46000-memory.dmp

    Filesize

    9.1MB

  • memory/4960-1-0x00000000010D0000-0x0000000001517000-memory.dmp

    Filesize

    4.3MB

  • memory/4960-4-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/4960-3-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/4960-6-0x0000000001520000-0x0000000001E46000-memory.dmp

    Filesize

    9.1MB

  • memory/5080-29-0x0000000001600000-0x0000000001B00000-memory.dmp

    Filesize

    5.0MB

  • memory/5080-34-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-21-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-28-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-20-0x0000000001600000-0x0000000001B00000-memory.dmp

    Filesize

    5.0MB

  • memory/5080-30-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-31-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-32-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-33-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-22-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-35-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-36-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-37-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-38-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-39-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-40-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB

  • memory/5080-41-0x0000000000400000-0x0000000000D41000-memory.dmp

    Filesize

    9.3MB