Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/01/2023, 19:05

General

  • Target
    file.exe
  • Size 365KB
  • Sample230104-xrg3sacg21
  • SHA256 80662aed81dba632c47288ed28fcfc650bf8b5dc7df59b65ea8fdd26b0b67c00
  • 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 1 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 3 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 1 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:1612
  • C:\Users\Admin\AppData\Local\Temp\71C5.exe
    C:\Users\Admin\AppData\Local\Temp\71C5.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:2372
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Pyupydeoe.tmp",Uprsprhaot
      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:1748
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 23995
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:1996
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:3060
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:2084
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2372 -s 556
          2⤵
          • Program crash
          PID:3548
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2372 -ip 2372
        1⤵
          PID:812
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:4644

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                71C5.exe

                • Path C:\Users\Admin\AppData\Local\Temp\71C5.exe
                • Size 1.1MB
                • SHA256 87cd504c0df4d0a33a6c28a7362838596b986b6582a691124ae4a5aa34a093a5
                • MD5 SHA1 SHA512 SSDEEP

                71C5.exe

                • Path C:\Users\Admin\AppData\Local\Temp\71C5.exe
                • Size 1.1MB
                • SHA256 87cd504c0df4d0a33a6c28a7362838596b986b6582a691124ae4a5aa34a093a5
                • MD5 SHA1 SHA512 SSDEEP

                Pyupydeoe.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\Pyupydeoe.tmp
                • Size 784KB
                • SHA256 20dc61c5456ea5756f432aebecf74660acebf5ace0f7c8d1b360757ed79075d8
                • MD5 SHA1 SHA512 SSDEEP

                Pyupydeoe.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\Pyupydeoe.tmp
                • Size 784KB
                • SHA256 20dc61c5456ea5756f432aebecf74660acebf5ace0f7c8d1b360757ed79075d8
                • MD5 SHA1 SHA512 SSDEEP

                memory/1612-133-0x0000000002CC0000-0x0000000002CC9000-memory.dmp

                memory/1612-134-0x0000000000400000-0x0000000002C4E000-memory.dmp

                memory/1612-135-0x0000000000400000-0x0000000002C4E000-memory.dmp

                memory/1612-132-0x0000000002D8D000-0x0000000002DA2000-memory.dmp

                memory/1748-152-0x0000000004AC0000-0x0000000004C00000-memory.dmp

                memory/1748-149-0x0000000004AC0000-0x0000000004C00000-memory.dmp

                memory/1748-160-0x0000000006960000-0x00000000074B2000-memory.dmp

                memory/1748-151-0x0000000004AC0000-0x0000000004C00000-memory.dmp

                memory/1748-150-0x0000000004AC0000-0x0000000004C00000-memory.dmp

                memory/1748-146-0x0000000006960000-0x00000000074B2000-memory.dmp

                memory/1748-147-0x0000000004AC0000-0x0000000004C00000-memory.dmp

                memory/1748-148-0x0000000004AC0000-0x0000000004C00000-memory.dmp

                memory/1996-155-0x0000016E6FBC0000-0x0000016E6FD00000-memory.dmp

                memory/1996-154-0x0000016E6FBC0000-0x0000016E6FD00000-memory.dmp

                memory/1996-156-0x0000000000E50000-0x00000000010EB000-memory.dmp

                memory/1996-157-0x0000016E6E170000-0x0000016E6E41C000-memory.dmp

                memory/2372-145-0x0000000000400000-0x0000000002D11000-memory.dmp

                memory/2372-144-0x0000000000400000-0x0000000002D11000-memory.dmp

                memory/2372-140-0x0000000004BB0000-0x0000000004CC2000-memory.dmp

                memory/2372-139-0x0000000004ACC000-0x0000000004BA4000-memory.dmp