Analysis

  • max time kernel
    150s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/02/2023, 16:29

General

  • Target
    file.exe
  • Size 252KB
  • Sample230216-ty8mjaae69
  • SHA256 b466be611c7dcbda603596a11d17aeaea5f717fa8eb7e450adf8dac4e58ec9f5
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Detects Smokeloader packer 1 IoCs
  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Accesses Microsoft Outlook profiles 1 TTPs 4 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 6 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 23 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
  • Modifies registry class 30 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 25 IoCs
  • Suspicious use of FindShellTrayWindow 10 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:4492
  • C:\Users\Admin\AppData\Roaming\uhftudf
    C:\Users\Admin\AppData\Roaming\uhftudf
    1⤵
    • Executes dropped EXE
    • Checks SCSI registry key(s)
    • Suspicious behavior: MapViewOfSection
    PID:4956
  • C:\Users\Admin\AppData\Local\Temp\8107.exe
    C:\Users\Admin\AppData\Local\Temp\8107.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:224
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll,start
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Accesses Microsoft Outlook accounts
      • Accesses Microsoft Outlook profiles
      • Suspicious use of SetThreadContext
      • Checks processor information in registry
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      • outlook_office_path
      • outlook_win_path
      PID:4332
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 14140
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:3544
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:2208
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:3080
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 224 -s 484
          2⤵
          • Program crash
          PID:2716
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 224 -ip 224
        1⤵
          PID:4040
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:4612

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                8107.exe

                • Path C:\Users\Admin\AppData\Local\Temp\8107.exe
                • Size 3.7MB
                • SHA256 9be7694185023a6cda212f05fdb3ed1b6358011fbba9abdccc71633350a8f1f4
                • MD5 SHA1 SHA512 SSDEEP

                8107.exe

                • Path C:\Users\Admin\AppData\Local\Temp\8107.exe
                • Size 3.7MB
                • SHA256 9be7694185023a6cda212f05fdb3ed1b6358011fbba9abdccc71633350a8f1f4
                • MD5 SHA1 SHA512 SSDEEP

                Ruifriwreh.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll
                • Size 4.3MB
                • SHA256 540a3e14a341bb3c3ffee5a1b353980bf6ef99bb28760db75865bfe95e6a1ce9
                • MD5 SHA1 SHA512 SSDEEP

                Ruifriwreh.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll
                • Size 4.3MB
                • SHA256 540a3e14a341bb3c3ffee5a1b353980bf6ef99bb28760db75865bfe95e6a1ce9
                • MD5 SHA1 SHA512 SSDEEP

                uhftudf

                • Path C:\Users\Admin\AppData\Roaming\uhftudf
                • Size 252KB
                • SHA256 b466be611c7dcbda603596a11d17aeaea5f717fa8eb7e450adf8dac4e58ec9f5
                • MD5 SHA1 SHA512 SSDEEP

                uhftudf

                • Path C:\Users\Admin\AppData\Roaming\uhftudf
                • Size 252KB
                • SHA256 b466be611c7dcbda603596a11d17aeaea5f717fa8eb7e450adf8dac4e58ec9f5
                • MD5 SHA1 SHA512 SSDEEP

                memory/224-151-0x0000000000400000-0x0000000000931000-memory.dmp

                memory/224-146-0x0000000000400000-0x0000000000931000-memory.dmp

                memory/224-147-0x0000000000400000-0x0000000000931000-memory.dmp

                memory/224-144-0x00000000025FE000-0x0000000002986000-memory.dmp

                memory/224-145-0x0000000002990000-0x0000000002E7A000-memory.dmp

                memory/3544-165-0x0000000000560000-0x00000000007F7000-memory.dmp

                memory/3544-170-0x000001EB3B950000-0x000001EB3BBF9000-memory.dmp

                memory/3544-162-0x000001EB3B800000-0x000001EB3B940000-memory.dmp

                memory/3544-166-0x000001EB3B950000-0x000001EB3BBF9000-memory.dmp

                memory/3544-164-0x000001EB3B800000-0x000001EB3B940000-memory.dmp

                memory/4332-159-0x00000000042C0000-0x0000000004400000-memory.dmp

                memory/4332-152-0x0000000003670000-0x00000000041BD000-memory.dmp

                memory/4332-154-0x0000000003670000-0x00000000041BD000-memory.dmp

                memory/4332-155-0x00000000042C0000-0x0000000004400000-memory.dmp

                memory/4332-156-0x00000000042C0000-0x0000000004400000-memory.dmp

                memory/4332-157-0x0000000004CE0000-0x0000000004E20000-memory.dmp

                memory/4332-158-0x0000000004CE0000-0x0000000004E20000-memory.dmp

                memory/4332-171-0x0000000004D97000-0x0000000004D99000-memory.dmp

                memory/4332-160-0x00000000042C0000-0x0000000004400000-memory.dmp

                memory/4332-153-0x0000000003670000-0x00000000041BD000-memory.dmp

                memory/4332-168-0x0000000003670000-0x00000000041BD000-memory.dmp

                memory/4332-163-0x0000000004D97000-0x0000000004D99000-memory.dmp

                memory/4492-134-0x0000000000400000-0x00000000005BB000-memory.dmp

                memory/4492-135-0x0000000000400000-0x00000000005BB000-memory.dmp

                memory/4492-133-0x0000000000750000-0x0000000000759000-memory.dmp

                memory/4492-132-0x00000000007E1000-0x00000000007F7000-memory.dmp

                memory/4956-138-0x0000000000800000-0x0000000000815000-memory.dmp

                memory/4956-139-0x0000000000400000-0x00000000005BB000-memory.dmp

                memory/4956-140-0x0000000000400000-0x00000000005BB000-memory.dmp