Analysis

  • max time kernel
    149s
  • max time network
    100s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/06/2024, 00:03

General

  • Target
    8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
  • Size 879KB
  • Sample240604-acfj3seh38
  • SHA256 8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • UPX dump on OEP (original entry point) 28 IoCs
  • Checks computer location settings 2 TTPs 8 IoCs

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

  • Executes dropped EXE 7 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.

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
    "C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1524
    • C:\Users\Public\Microsoft Build\Isass.exe
      "C:\Users\Public\Microsoft Build\Isass.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      PID:1964
    • C:\Users\Public\Microsoft Build\Isass.exe
      "C:\Users\Public\Microsoft Build\Isass.exe" Tablet C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3240
      • C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
        "C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe"
        3⤵
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:3956
        • C:\Users\Public\Microsoft Build\Isass.exe
          "C:\Users\Public\Microsoft Build\Isass.exe" Tablet C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
          4⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3948
          • C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
            "C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe"
            5⤵
            • Checks computer location settings
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of WriteProcessMemory
            PID:2180
            • C:\Users\Public\Microsoft Build\Isass.exe
              "C:\Users\Public\Microsoft Build\Isass.exe" Tablet C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
              6⤵
              • Checks computer location settings
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of WriteProcessMemory
              PID:3100
              • C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
                "C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe"
                7⤵
                • Checks computer location settings
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:2820
                • C:\Users\Public\Microsoft Build\Isass.exe
                  "C:\Users\Public\Microsoft Build\Isass.exe" Tablet C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
                  8⤵
                  • Checks computer location settings
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of WriteProcessMemory
                  PID:536
                  • C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
                    "C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe"
                    9⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:640
                    • C:\Windows\Temp\{B8706458-F36B-4AB3-B967-F8949F5D8ED2}\.cr\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
                      "C:\Windows\Temp\{B8706458-F36B-4AB3-B967-F8949F5D8ED2}\.cr\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe" -burn.clean.room="C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe" -burn.filehandle.attached=552 -burn.filehandle.self=548
                      10⤵
                      • Executes dropped EXE
                      • Loads dropped DLL
                      PID:5056

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        FileCoAuth.exe

        • Path C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe
        • Size 685KB
        • SHA256 7da8d1a79ae3939cdfee38b38482cc7bbaad581dbf6fb3943f35f705d0b11f3a
        • MD5 SHA1 SHA512 SSDEEP

        8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe

        • Path C:\Users\Admin\AppData\Local\Temp\8c7a76d35d78bd597a511e4a5ac0986107b948595a5aad9be889df506b9baf51.exe
        • Size 635KB
        • SHA256 ab1164dcaf6c7d7d4905881f332a7b6f854be46e36b860c44d9eedc96ab6607a
        • MD5 SHA1 SHA512 SSDEEP

        Isass.exe

        • Path C:\Users\Public\Microsoft Build\Isass.exe
        • Size 216KB
        • SHA256 da347f6169ee82f755889c1f0079ef2a70e16bb9aacd0147ce7e689bbb4166ca
        • MD5 SHA1 SHA512 SSDEEP

        logo.png

        • Path C:\Windows\Temp\{3231E5C9-3C70-4667-B99D-3A696B572A70}\.ba\logo.png
        • Size 1KB
        • SHA256 335a256d4779ec5dcf283d007fb56fd8211bbcaf47dcd70fe60ded6a112744ef
        • MD5 SHA1 SHA512

        wixstdba.dll

        • Path C:\Windows\Temp\{3231E5C9-3C70-4667-B99D-3A696B572A70}\.ba\wixstdba.dll
        • Size 191KB
        • SHA256 a4efbdb2ce55788ffe92a244cb775efd475526ef5b61ad78de2bcdfaddac7041
        • MD5 SHA1 SHA512 SSDEEP

        memory/536-34-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1524-4-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1524-8-0x00000000001F0000-0x00000000001F1000-memory.dmp

        memory/1524-11-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-100-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-101-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-140-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-128-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-127-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-119-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-115-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-108-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-107-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-83-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-86-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-87-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-9-0x0000000003610000-0x0000000003611000-memory.dmp

        memory/1964-91-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-92-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/1964-5-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/2180-20-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/2820-23-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/3100-21-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/3240-10-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/3240-13-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/3948-18-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/3956-15-0x0000000000400000-0x00000000016A8E52-memory.dmp

        memory/3956-16-0x0000000000400000-0x00000000016A8E52-memory.dmp