Analysis

  • max time kernel
    844s
  • max time network
    1571s
  • platform
    windows10_x64
  • resource
    win10-en-20211208
  • submitted
    08/12/2021, 15:50

General

  • Target

    mrkbajwnyr.txt.jar

  • Size

    185KB

  • MD5

    4a769959e2ee2785d32ef2161f28cd8b

  • SHA1

    e31b455b90081313e3b7405db3efe1582fe39daa

  • SHA256

    496536d34981fc4155772fe136930ef13cf16116a4df18e6261dd084fce40b21

  • SHA512

    8ef798581834a365f8a7649572c8683e9294cb950917b9c1e9b6ae60bf48b2e4d0e3be312843e398868f31835f276df24f4c5c2b6fb07b654322a8d5351815ca

Malware Config

Signatures

  • STRRAT

    STRRAT is a remote access tool than can steal credentials and log keystrokes.

  • Drops startup file 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in Program Files directory 12 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\ProgramData\Oracle\Java\javapath\java.exe
    java -jar C:\Users\Admin\AppData\Local\Temp\mrkbajwnyr.txt.jar
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3488
    • C:\Program Files\Java\jre1.8.0_66\bin\java.exe
      "C:\Program Files\Java\jre1.8.0_66\bin\java.exe" -jar "C:\Users\Admin\mrkbajwnyr.txt.jar"
      2⤵
      • Drops startup file
      • Loads dropped DLL
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:1472
      • C:\Windows\SYSTEM32\cmd.exe
        cmd /c schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\mrkbajwnyr.txt.jar"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2324
        • C:\Windows\system32\schtasks.exe
          schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\mrkbajwnyr.txt.jar"
          4⤵
          • Creates scheduled task(s)
          PID:1900
      • C:\Program Files\Java\jre1.8.0_66\bin\java.exe
        "C:\Program Files\Java\jre1.8.0_66\bin\java.exe" -jar "C:\Users\Admin\AppData\Roaming\mrkbajwnyr.txt.jar"
        3⤵
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Suspicious use of WriteProcessMemory
        PID:2912
        • C:\Windows\SYSTEM32\cmd.exe
          cmd.exe /c "wmic /node:. /namespace:'\\root\cimv2' path win32_logicaldisk get volumeserialnumber /format:list"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3980
          • C:\Windows\System32\Wbem\WMIC.exe
            wmic /node:. /namespace:'\\root\cimv2' path win32_logicaldisk get volumeserialnumber /format:list
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:3736
        • C:\Windows\SYSTEM32\cmd.exe
          cmd.exe /c "wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get caption,OSArchitecture /format:list"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2316
          • C:\Windows\System32\Wbem\WMIC.exe
            wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get caption,OSArchitecture /format:list
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1492
        • C:\Windows\SYSTEM32\cmd.exe
          cmd.exe /c "wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get version /format:list"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2040
          • C:\Windows\System32\Wbem\WMIC.exe
            wmic /node:. /namespace:'\\root\cimv2' path win32_operatingsystem get version /format:list
            5⤵
              PID:2668
          • C:\Windows\SYSTEM32\cmd.exe
            cmd.exe /c "wmic /node:localhost /namespace:'\\root\securitycenter2' path antivirusproduct get displayname /format:list"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1984
            • C:\Windows\System32\Wbem\WMIC.exe
              wmic /node:localhost /namespace:'\\root\securitycenter2' path antivirusproduct get displayname /format:list
              5⤵
                PID:3288

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            • memory/1472-292-0x0000000002C60000-0x0000000002C70000-memory.dmp

              Filesize

              64KB

            • memory/1472-299-0x0000000002C90000-0x0000000002CA0000-memory.dmp

              Filesize

              64KB

            • memory/1472-283-0x00000000029E0000-0x0000000002C50000-memory.dmp

              Filesize

              2.4MB

            • memory/1472-291-0x0000000002C50000-0x0000000002C60000-memory.dmp

              Filesize

              64KB

            • memory/1472-293-0x0000000002C70000-0x0000000002C80000-memory.dmp

              Filesize

              64KB

            • memory/1472-294-0x0000000002C80000-0x0000000002C90000-memory.dmp

              Filesize

              64KB

            • memory/1472-300-0x0000000002CA0000-0x0000000002CB0000-memory.dmp

              Filesize

              64KB

            • memory/1472-301-0x0000000002CB0000-0x0000000002CC0000-memory.dmp

              Filesize

              64KB

            • memory/2912-329-0x0000000002E80000-0x0000000002E90000-memory.dmp

              Filesize

              64KB

            • memory/2912-332-0x0000000002E60000-0x0000000002E70000-memory.dmp

              Filesize

              64KB

            • memory/2912-368-0x0000000002EF0000-0x0000000002F00000-memory.dmp

              Filesize

              64KB

            • memory/2912-365-0x0000000002EE0000-0x0000000002EF0000-memory.dmp

              Filesize

              64KB

            • memory/2912-362-0x0000000002ED0000-0x0000000002EE0000-memory.dmp

              Filesize

              64KB

            • memory/2912-360-0x0000000002EC0000-0x0000000002ED0000-memory.dmp

              Filesize

              64KB

            • memory/2912-358-0x0000000002EB0000-0x0000000002EC0000-memory.dmp

              Filesize

              64KB

            • memory/2912-356-0x0000000002EA0000-0x0000000002EB0000-memory.dmp

              Filesize

              64KB

            • memory/2912-315-0x0000000002B90000-0x0000000002E00000-memory.dmp

              Filesize

              2.4MB

            • memory/2912-331-0x0000000002E50000-0x0000000002E60000-memory.dmp

              Filesize

              64KB

            • memory/2912-330-0x0000000002E90000-0x0000000002EA0000-memory.dmp

              Filesize

              64KB

            • memory/2912-328-0x0000000002E40000-0x0000000002E50000-memory.dmp

              Filesize

              64KB

            • memory/2912-327-0x0000000002E70000-0x0000000002E80000-memory.dmp

              Filesize

              64KB

            • memory/2912-326-0x0000000002E30000-0x0000000002E40000-memory.dmp

              Filesize

              64KB

            • memory/2912-325-0x0000000002E20000-0x0000000002E30000-memory.dmp

              Filesize

              64KB

            • memory/2912-319-0x0000000002E10000-0x0000000002E20000-memory.dmp

              Filesize

              64KB

            • memory/2912-317-0x0000000002E00000-0x0000000002E10000-memory.dmp

              Filesize

              64KB

            • memory/3488-122-0x0000000002FF0000-0x0000000003000000-memory.dmp

              Filesize

              64KB

            • memory/3488-115-0x0000000002D80000-0x0000000002FF0000-memory.dmp

              Filesize

              2.4MB

            • memory/3488-184-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-188-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-128-0x0000000003020000-0x0000000003030000-memory.dmp

              Filesize

              64KB

            • memory/3488-127-0x0000000003010000-0x0000000003020000-memory.dmp

              Filesize

              64KB

            • memory/3488-125-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-124-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-123-0x0000000003000000-0x0000000003010000-memory.dmp

              Filesize

              64KB

            • memory/3488-247-0x0000000003150000-0x0000000003160000-memory.dmp

              Filesize

              64KB

            • memory/3488-180-0x00000000030F0000-0x0000000003100000-memory.dmp

              Filesize

              64KB

            • memory/3488-195-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-129-0x0000000003030000-0x0000000003040000-memory.dmp

              Filesize

              64KB

            • memory/3488-130-0x0000000003040000-0x0000000003050000-memory.dmp

              Filesize

              64KB

            • memory/3488-117-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-116-0x0000000002D80000-0x0000000002FF0000-memory.dmp

              Filesize

              2.4MB

            • memory/3488-215-0x0000000003100000-0x0000000003110000-memory.dmp

              Filesize

              64KB

            • memory/3488-237-0x0000000003120000-0x0000000003130000-memory.dmp

              Filesize

              64KB

            • memory/3488-236-0x0000000003110000-0x0000000003120000-memory.dmp

              Filesize

              64KB

            • memory/3488-186-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-146-0x0000000003090000-0x00000000030A0000-memory.dmp

              Filesize

              64KB

            • memory/3488-135-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-134-0x0000000003050000-0x0000000003060000-memory.dmp

              Filesize

              64KB

            • memory/3488-137-0x0000000003070000-0x0000000003080000-memory.dmp

              Filesize

              64KB

            • memory/3488-258-0x0000000003160000-0x0000000003170000-memory.dmp

              Filesize

              64KB

            • memory/3488-273-0x0000000003170000-0x0000000003180000-memory.dmp

              Filesize

              64KB

            • memory/3488-179-0x00000000030E0000-0x00000000030F0000-memory.dmp

              Filesize

              64KB

            • memory/3488-164-0x00000000030C0000-0x00000000030D0000-memory.dmp

              Filesize

              64KB

            • memory/3488-165-0x00000000030D0000-0x00000000030E0000-memory.dmp

              Filesize

              64KB

            • memory/3488-148-0x00000000030B0000-0x00000000030C0000-memory.dmp

              Filesize

              64KB

            • memory/3488-147-0x00000000030A0000-0x00000000030B0000-memory.dmp

              Filesize

              64KB

            • memory/3488-136-0x0000000003060000-0x0000000003070000-memory.dmp

              Filesize

              64KB

            • memory/3488-138-0x0000000000CD0000-0x0000000000CD1000-memory.dmp

              Filesize

              4KB

            • memory/3488-244-0x0000000003130000-0x0000000003140000-memory.dmp

              Filesize

              64KB

            • memory/3488-145-0x0000000003080000-0x0000000003090000-memory.dmp

              Filesize

              64KB

            • memory/3488-245-0x0000000003140000-0x0000000003150000-memory.dmp

              Filesize

              64KB