Analysis

  • max time kernel
    40s
  • max time network
    43s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    21/11/2022, 23:29

General

  • Target
    bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b.exe
  • Size 352KB
  • Sample221121-3glk4sbe39
  • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • ISR Stealer

    ISR Stealer is a modified version of Hackhound Stealer written in visual basic.

  • ISR Stealer payload 11 IoCs
  • Executes dropped EXE 10 IoCs
  • Adds Run key to start application 2 TTPs 20 IoCs
  • Suspicious use of SetThreadContext 9 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of WriteProcessMemory 63 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b.exe
    "C:\Users\Admin\AppData\Local\Temp\bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1516
    • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
      "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:1168
      • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
        "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1684
        • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
          "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:948
          • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
            5⤵
            • Executes dropped EXE
            • Adds Run key to start application
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:1584
            • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
              "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
              6⤵
              • Executes dropped EXE
              • Adds Run key to start application
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:800
              • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
                "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
                7⤵
                • Executes dropped EXE
                • Adds Run key to start application
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:2004
                • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
                  "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
                  8⤵
                  • Executes dropped EXE
                  • Adds Run key to start application
                  • Suspicious use of SetThreadContext
                  • Suspicious use of WriteProcessMemory
                  PID:1492
                  • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
                    "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
                    9⤵
                    • Executes dropped EXE
                    • Adds Run key to start application
                    • Suspicious use of SetThreadContext
                    • Suspicious use of WriteProcessMemory
                    PID:564
                    • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
                      "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
                      10⤵
                      • Executes dropped EXE
                      • Adds Run key to start application
                      • Suspicious use of SetThreadContext
                      • Suspicious use of WriteProcessMemory
                      PID:632
                      • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
                        "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
                        11⤵
                        • Executes dropped EXE
                        • Adds Run key to start application
                        • Suspicious use of WriteProcessMemory
                        PID:1872
                        • C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
                          "C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe"
                          12⤵
                            PID:1728
            • C:\Windows\Microsoft.NET\Framework64\v2.0.50727\dw20.exe
              dw20.exe -x -s 464
              5⤵
                PID:1824

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            winlogon.exe

            • Path C:\Users\Admin\AppData\Roaming\SubFolder\SubFolder\winlogon.exe
            • Size 352KB
            • SHA256 bb9e8fb1a954a00fffa3c29dca8807d09e6c31a44d597e3d278ad98d0ed4b80b
            • MD5 SHA1 SHA512 SSDEEP

            memory/800-113-0x000007FEED530000-0x000007FEEE5C6000-memory.dmp

            memory/800-112-0x000007FEF4B70000-0x000007FEF5593000-memory.dmp

            memory/948-86-0x000007FEF4B70000-0x000007FEF5593000-memory.dmp

            memory/948-87-0x000007FEED530000-0x000007FEEE5C6000-memory.dmp

            memory/1168-61-0x000007FEED530000-0x000007FEEE5C6000-memory.dmp

            memory/1168-60-0x000007FEF4B70000-0x000007FEF5593000-memory.dmp

            memory/1516-56-0x000007FEFB7E1000-0x000007FEFB7E3000-memory.dmp

            memory/1516-54-0x000007FEF3E20000-0x000007FEF4843000-memory.dmp

            memory/1516-55-0x000007FEF2030000-0x000007FEF30C6000-memory.dmp

            memory/1584-100-0x000007FEED530000-0x000007FEEE5C6000-memory.dmp

            memory/1584-99-0x000007FEF4B70000-0x000007FEF5593000-memory.dmp

            memory/1684-65-0x0000000000400000-0x0000000000442000-memory.dmp

            memory/1684-74-0x000007FEED530000-0x000007FEEE5C6000-memory.dmp

            memory/1684-73-0x000007FEF4B70000-0x000007FEF5593000-memory.dmp

            memory/1684-69-0x0000000000400000-0x0000000000442000-memory.dmp

            memory/1684-62-0x0000000000400000-0x0000000000442000-memory.dmp

            memory/1684-63-0x0000000000400000-0x0000000000442000-memory.dmp

            memory/2004-125-0x000007FEF4B70000-0x000007FEF5593000-memory.dmp

            memory/2004-126-0x000007FEED530000-0x000007FEEE5C6000-memory.dmp