Resubmissions

21-11-2020 16:12

201121-3vsypzcqyx 10

21-11-2020 15:12

201121-c152v5zkxx 10

Analysis

  • max time kernel
    111s
  • max time network
    9s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    21-11-2020 15:12

General

  • Target

    e7c277aae66085f1e0c4789fe51cac50e3ea86d79c8a242ffc066ed0b0548037.bin.exe

  • Size

    532KB

  • MD5

    76f547c793b5478b970c64caf04d01d4

  • SHA1

    f9eb40f6d3d4c83852e3781886db762bef8564e0

  • SHA256

    e7c277aae66085f1e0c4789fe51cac50e3ea86d79c8a242ffc066ed0b0548037

  • SHA512

    91e91a8b693cb253f281411260611a221a113b342eaa642a9d6597aaf86c138ee2aa28ade10218a814ae34016e6d70824e36786497476ab704defddf60e33e17

Malware Config

Signatures

  • MountLocker Ransomware

    Ransomware family first seen in late 2020, which threatens to leak files if ransom is not paid.

  • Deletes shadow copies ⋅ 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files ⋅ 10 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Deletes itself ⋅ 1 IoCs
  • Drops desktop.ini file(s) ⋅ 29 IoCs
  • Modifies service ⋅ 2 TTPs 4 IoCs
  • Drops file in Program Files directory ⋅ 9143 IoCs
  • Interacts with shadow copies ⋅ 2 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Modifies registry class ⋅ 5 IoCs
  • Suspicious behavior: EnumeratesProcesses ⋅ 2 IoCs
  • Suspicious use of AdjustPrivilegeToken ⋅ 6 IoCs
  • Suspicious use of SetWindowsHookEx ⋅ 1 IoCs
  • Suspicious use of WriteProcessMemory ⋅ 20 IoCs
  • Views/modifies file attributes ⋅ 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e7c277aae66085f1e0c4789fe51cac50e3ea86d79c8a242ffc066ed0b0548037.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\e7c277aae66085f1e0c4789fe51cac50e3ea86d79c8a242ffc066ed0b0548037.bin.exe"
    Modifies extensions of user files
    Drops desktop.ini file(s)
    Drops file in Program Files directory
    Modifies registry class
    Suspicious use of AdjustPrivilegeToken
    Suspicious use of SetWindowsHookEx
    Suspicious use of WriteProcessMemory
    PID:1664
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      PID:1168
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe -windowstyle hidden -c $mypid='1664';[System.IO.File]::ReadAllText('C:\Users\Admin\AppData\Local\Temp\~259281134.tmp')|iex
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1680
      • C:\Windows\SysWOW64\vssadmin.exe
        "C:\Windows\system32\vssadmin.exe" delete shadows /all /Quiet
        Interacts with shadow copies
        PID:1120
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\\0F75EACC.bat" "C:\Users\Admin\AppData\Local\Temp\e7c277aae66085f1e0c4789fe51cac50e3ea86d79c8a242ffc066ed0b0548037.bin.exe""
      Deletes itself
      Suspicious use of WriteProcessMemory
      PID:1652
      • C:\Windows\SysWOW64\attrib.exe
        attrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\e7c277aae66085f1e0c4789fe51cac50e3ea86d79c8a242ffc066ed0b0548037.bin.exe"
        Views/modifies file attributes
        PID:1120
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    Modifies service
    Suspicious use of AdjustPrivilegeToken
    PID:952

Network

MITRE ATT&CK Matrix

Collection

    Command and Control

      Credential Access

        Discovery

          Execution

            Exfiltration

              Initial Access

                Lateral Movement

                  Privilege Escalation

                    Replay Monitor

                    00:00 00:00

                    Downloads

                    • C:\Users\Admin\AppData\Local\Temp\0F75EACC.bat
                      MD5

                      348cae913e496198548854f5ff2f6d1e

                      SHA1

                      a07655b9020205bd47084afd62a8bb22b48c0cdc

                      SHA256

                      c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506

                      SHA512

                      799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611

                    • C:\Users\Admin\AppData\Local\Temp\~259281134.tmp
                      MD5

                      4e1a1e3e715c291c71950d2fdc79e2be

                      SHA1

                      dc2b3d20a9ec88e0d8d75c5097154687acc42983

                      SHA256

                      acf88b9224ae067d92882d1c8ec1461a663e83f02848488ce125dc0538d87a39

                      SHA512

                      d1be9f6459c248a93c95cc40a68e60ca2fe8068ff4ed5d442437a72bcc09ebf8568e3338d39abebbf3fe8e9e4e3a21a58e1ed6bdbcdd0a3b2ca46b6a81597d80

                    • memory/1120-28-0x0000000000000000-mapping.dmp
                    • memory/1120-33-0x0000000000000000-mapping.dmp
                    • memory/1168-2-0x0000000000000000-mapping.dmp
                    • memory/1652-29-0x0000000000000000-mapping.dmp
                    • memory/1664-3-0x00000000003E0000-0x00000000003EF000-memory.dmp
                      Filesize

                      60KB

                    • memory/1664-31-0x0000000002790000-0x0000000002794000-memory.dmp
                      Filesize

                      16KB

                    • memory/1664-30-0x00000000002C0000-0x00000000002C4000-memory.dmp
                      Filesize

                      16KB

                    • memory/1680-7-0x0000000004830000-0x0000000004831000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-18-0x00000000056D0000-0x00000000056D1000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-19-0x0000000006250000-0x0000000006251000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-26-0x00000000062E0000-0x00000000062E1000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-27-0x0000000006300000-0x0000000006301000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-13-0x0000000005620000-0x0000000005621000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-9-0x0000000005320000-0x0000000005321000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-8-0x0000000002580000-0x0000000002581000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-6-0x0000000000D20000-0x0000000000D21000-memory.dmp
                      Filesize

                      4KB

                    • memory/1680-5-0x0000000073A30000-0x000000007411E000-memory.dmp
                      Filesize

                      6MB

                    • memory/1680-4-0x0000000000000000-mapping.dmp