Analysis

  • max time kernel
    150s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/01/2023, 08:12

General

  • Target
    file.exe
  • Size 313KB
  • Sample230106-j3valafd54
  • SHA256 9519793cddbb21c43cf4c3685062b2c80d892e033b2edf5895a54beac9bd30f2
  • 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 29 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:780
  • C:\Users\Admin\AppData\Local\Temp\E95B.exe
    C:\Users\Admin\AppData\Local\Temp\E95B.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:4128
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Rewurtuihyfrtty.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:5060
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 14104
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:1784
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:3160
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:3284
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4128 -s 700
          2⤵
          • Program crash
          PID:4816
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4128 -ip 4128
        1⤵
          PID:4896
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:620

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                E95B.exe

                • Path C:\Users\Admin\AppData\Local\Temp\E95B.exe
                • Size 3.7MB
                • SHA256 11bce2743ff66806ca0098b8237009f9ee04a79fc7351b93735051ce3cca880e
                • MD5 SHA1 SHA512 SSDEEP

                E95B.exe

                • Path C:\Users\Admin\AppData\Local\Temp\E95B.exe
                • Size 3.7MB
                • SHA256 11bce2743ff66806ca0098b8237009f9ee04a79fc7351b93735051ce3cca880e
                • MD5 SHA1 SHA512 SSDEEP

                Rewurtuihyfrtty.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Rewurtuihyfrtty.dll
                • Size 4.3MB
                • SHA256 54baaf31f9ef2a1de7499ed89aeb9c3f304bed8c83a47da0420c0e01016701f5
                • MD5 SHA1 SHA512 SSDEEP

                Rewurtuihyfrtty.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Rewurtuihyfrtty.dll
                • Size 4.3MB
                • SHA256 54baaf31f9ef2a1de7499ed89aeb9c3f304bed8c83a47da0420c0e01016701f5
                • MD5 SHA1 SHA512 SSDEEP

                memory/780-132-0x0000000002D97000-0x0000000002DAC000-memory.dmp

                memory/780-133-0x0000000003090000-0x0000000003099000-memory.dmp

                memory/780-134-0x0000000000400000-0x0000000002C40000-memory.dmp

                memory/780-135-0x0000000000400000-0x0000000002C40000-memory.dmp

                memory/1704-168-0x0000000002610000-0x0000000002620000-memory.dmp

                memory/1704-171-0x0000000002610000-0x0000000002620000-memory.dmp

                memory/1704-143-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-146-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-147-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-150-0x00000000025D0000-0x00000000025E0000-memory.dmp

                memory/1704-149-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-151-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-153-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-157-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-159-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-160-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-155-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-161-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-154-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-156-0x0000000002610000-0x0000000002620000-memory.dmp

                memory/1704-163-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-162-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-164-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-165-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-166-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-167-0x0000000002610000-0x0000000002620000-memory.dmp

                memory/1704-145-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1704-169-0x0000000002610000-0x0000000002620000-memory.dmp

                memory/1704-170-0x0000000002610000-0x0000000002620000-memory.dmp

                memory/1704-144-0x00000000022D0000-0x00000000022E0000-memory.dmp

                memory/1784-188-0x0000020DD0BB0000-0x0000020DD0CF0000-memory.dmp

                memory/1784-189-0x0000020DD0BB0000-0x0000020DD0CF0000-memory.dmp

                memory/1784-190-0x0000000000E60000-0x0000000001102000-memory.dmp

                memory/1784-191-0x0000020DCF2E0000-0x0000020DCF593000-memory.dmp

                memory/4128-176-0x0000000000400000-0x0000000002FAE000-memory.dmp

                memory/4128-140-0x00000000051E0000-0x00000000056C0000-memory.dmp

                memory/4128-139-0x00000000036B0000-0x0000000003A33000-memory.dmp

                memory/4128-142-0x0000000000400000-0x0000000002FAE000-memory.dmp

                memory/4128-141-0x0000000000400000-0x0000000002FAE000-memory.dmp

                memory/5060-175-0x0000000000400000-0x000000000084F000-memory.dmp

                memory/5060-183-0x0000000005380000-0x00000000054C0000-memory.dmp

                memory/5060-184-0x0000000005380000-0x00000000054C0000-memory.dmp

                memory/5060-185-0x0000000004950000-0x0000000004A90000-memory.dmp

                memory/5060-186-0x0000000004950000-0x0000000004A90000-memory.dmp

                memory/5060-182-0x0000000004950000-0x0000000004A90000-memory.dmp

                memory/5060-181-0x0000000004950000-0x0000000004A90000-memory.dmp

                memory/5060-180-0x0000000003D00000-0x0000000004886000-memory.dmp

                memory/5060-179-0x0000000003D00000-0x0000000004886000-memory.dmp

                memory/5060-178-0x0000000003D00000-0x0000000004886000-memory.dmp

                memory/5060-177-0x0000000000400000-0x000000000084F000-memory.dmp

                memory/5060-193-0x0000000003D00000-0x0000000004886000-memory.dmp