Analysis

  • max time kernel
    152s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/11/2022, 10:08

General

  • Target
    file.exe
  • Size 187KB
  • Sample221124-l571ksfe99
  • SHA256 f8fe2eed9f53c1553ef94fffe69e36175ee887ebca95b41c02eb105c1d45d6c3
  • 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 2 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 25 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 21 IoCs
  • Suspicious use of FindShellTrayWindow 10 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of UnmapMainImage 1 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:3368
  • C:\Users\Admin\AppData\Local\Temp\5842.exe
    C:\Users\Admin\AppData\Local\Temp\5842.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:1112
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Uayqupoehp.tmp",Rrptfe
      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:1432
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 14218
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:4576
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:4636
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:4880
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1112 -s 528
          2⤵
          • Program crash
          PID:3388
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1112 -ip 1112
        1⤵
          PID:4548
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:2336
          • C:\Users\Admin\AppData\Roaming\cgrwrci
            C:\Users\Admin\AppData\Roaming\cgrwrci
            1⤵
            • Executes dropped EXE
            • Checks SCSI registry key(s)
            • Suspicious behavior: MapViewOfSection
            PID:3532

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                5842.exe

                • Path C:\Users\Admin\AppData\Local\Temp\5842.exe
                • Size 1.0MB
                • SHA256 ba1cfbc32911a40a7d99b8c8145edd758a11ca1e706eaf6f2695644628667248
                • MD5 SHA1 SHA512 SSDEEP

                5842.exe

                • Path C:\Users\Admin\AppData\Local\Temp\5842.exe
                • Size 1.0MB
                • SHA256 ba1cfbc32911a40a7d99b8c8145edd758a11ca1e706eaf6f2695644628667248
                • MD5 SHA1 SHA512 SSDEEP

                Uayqupoehp.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\Uayqupoehp.tmp
                • Size 774KB
                • SHA256 f1828a7b26be78bb27df25b98762eb7dd7e49ee8582d5eee42ded05b0eebc1e4
                • MD5 SHA1 SHA512 SSDEEP

                Uayqupoehp.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\Uayqupoehp.tmp
                • Size 774KB
                • SHA256 f1828a7b26be78bb27df25b98762eb7dd7e49ee8582d5eee42ded05b0eebc1e4
                • MD5 SHA1 SHA512 SSDEEP

                cgrwrci

                • Path C:\Users\Admin\AppData\Roaming\cgrwrci
                • Size 187KB
                • SHA256 f8fe2eed9f53c1553ef94fffe69e36175ee887ebca95b41c02eb105c1d45d6c3
                • MD5 SHA1 SHA512 SSDEEP

                cgrwrci

                • Path C:\Users\Admin\AppData\Roaming\cgrwrci
                • Size 187KB
                • SHA256 f8fe2eed9f53c1553ef94fffe69e36175ee887ebca95b41c02eb105c1d45d6c3
                • MD5 SHA1 SHA512 SSDEEP

                memory/1112-142-0x0000000002371000-0x0000000002453000-memory.dmp

                memory/1112-144-0x0000000000400000-0x000000000071F000-memory.dmp

                memory/1112-143-0x00000000024B0000-0x00000000025D5000-memory.dmp

                memory/1432-148-0x00000000042B0000-0x00000000043F0000-memory.dmp

                memory/1432-151-0x00000000042B0000-0x00000000043F0000-memory.dmp

                memory/1432-145-0x0000000004C90000-0x00000000057F1000-memory.dmp

                memory/1432-146-0x0000000004C90000-0x00000000057F1000-memory.dmp

                memory/1432-147-0x00000000042B0000-0x00000000043F0000-memory.dmp

                memory/1432-152-0x00000000042B0000-0x00000000043F0000-memory.dmp

                memory/1432-149-0x00000000042B0000-0x00000000043F0000-memory.dmp

                memory/1432-150-0x00000000042B0000-0x00000000043F0000-memory.dmp

                memory/1432-159-0x0000000004C90000-0x00000000057F1000-memory.dmp

                memory/3368-132-0x000000000085D000-0x000000000086D000-memory.dmp

                memory/3368-135-0x0000000000400000-0x000000000064D000-memory.dmp

                memory/3368-133-0x00000000007A0000-0x00000000007A9000-memory.dmp

                memory/3368-134-0x0000000000400000-0x000000000064D000-memory.dmp

                memory/3532-165-0x0000000000400000-0x000000000064D000-memory.dmp

                memory/3532-164-0x0000000000400000-0x000000000064D000-memory.dmp

                memory/3532-163-0x000000000082D000-0x000000000083D000-memory.dmp

                memory/4576-157-0x0000021203DD0000-0x0000021204074000-memory.dmp

                memory/4576-156-0x0000000000870000-0x0000000000B02000-memory.dmp

                memory/4576-155-0x0000021205690000-0x00000212057D0000-memory.dmp

                memory/4576-154-0x0000021205690000-0x00000212057D0000-memory.dmp