Analysis

  • max time kernel
    173s
  • max time network
    46s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    03-05-2022 15:11

General

  • Target

    761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997.exe

  • Size

    2.6MB

  • MD5

    678c88c9fa4bd905d617530e3ed3f092

  • SHA1

    f2019598e111d8833fb0a7b663e5035a3db47eac

  • SHA256

    761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997

  • SHA512

    aa1b26d398f273a838d6623701ba84314cc691c4bbbc51703af34ad3d5f503a66dc42fb5838e66f4e84004aaf23e29caf6113a8b17891179b62fd3d7773cde5d

Malware Config

Signatures

  • WastedLocker

    Ransomware family seen in the wild since May 2020.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
  • Executes dropped EXE 2 IoCs
  • Modifies extensions of user files 18 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Possible privilege escalation attempt 2 IoCs
  • Checks BIOS information in registry 2 TTPs 6 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Themida packer 7 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Checks whether UAC is enabled 1 TTPs 3 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 3 IoCs
  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • NTFS ADS 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs
  • Views/modifies file attributes 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997.exe
    "C:\Users\Admin\AppData\Local\Temp\761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997.exe"
    1⤵
    • Checks BIOS information in registry
    • Loads dropped DLL
    • Checks whether UAC is enabled
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • NTFS ADS
    • Suspicious use of WriteProcessMemory
    PID:780
    • C:\Users\Admin\AppData\Roaming\Categories:bin
      C:\Users\Admin\AppData\Roaming\Categories:bin -r
      2⤵
      • Executes dropped EXE
      • Checks BIOS information in registry
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of WriteProcessMemory
      PID:1580
      • C:\Windows\system32\vssadmin.exe
        C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:1728
      • C:\Windows\SysWOW64\takeown.exe
        C:\Windows\system32\takeown.exe /F C:\Windows\system32\Categories.exe
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:1748
      • C:\Windows\SysWOW64\icacls.exe
        C:\Windows\system32\icacls.exe C:\Windows\system32\Categories.exe /reset
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:684
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Categories" & del "C:\Users\Admin\AppData\Roaming\Categories"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1604
        • C:\Windows\SysWOW64\choice.exe
          choice /t 10 /d y
          4⤵
            PID:364
          • C:\Windows\SysWOW64\attrib.exe
            attrib -h "C:\Users\Admin\AppData\Roaming\Categories"
            4⤵
            • Views/modifies file attributes
            PID:536
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997.exe" & del "C:\Users\Admin\AppData\Local\Temp\761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997.exe"
        2⤵
        • Deletes itself
        • Suspicious use of WriteProcessMemory
        PID:1600
        • C:\Windows\SysWOW64\choice.exe
          choice /t 10 /d y
          3⤵
            PID:1584
          • C:\Windows\SysWOW64\attrib.exe
            attrib -h "C:\Users\Admin\AppData\Local\Temp\761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997.exe"
            3⤵
            • Views/modifies file attributes
            PID:1660
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2000
      • C:\Windows\SysWOW64\Categories.exe
        C:\Windows\SysWOW64\Categories.exe -s
        1⤵
        • Executes dropped EXE
        • Modifies extensions of user files
        • Checks BIOS information in registry
        • Checks whether UAC is enabled
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious use of WriteProcessMemory
        PID:1396
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Categories.exe" & del "C:\Windows\SysWOW64\Categories.exe"
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:896
          • C:\Windows\SysWOW64\choice.exe
            choice /t 10 /d y
            3⤵
              PID:908
            • C:\Windows\SysWOW64\attrib.exe
              attrib -h "C:\Windows\SysWOW64\Categories.exe"
              3⤵
              • Drops file in System32 directory
              • Views/modifies file attributes
              PID:1644

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Hidden Files and Directories

        1
        T1158

        Defense Evasion

        File Deletion

        2
        T1107

        Virtualization/Sandbox Evasion

        1
        T1497

        File Permissions Modification

        1
        T1222

        Hidden Files and Directories

        1
        T1158

        Discovery

        Query Registry

        2
        T1012

        Virtualization/Sandbox Evasion

        1
        T1497

        System Information Discovery

        2
        T1082

        Impact

        Inhibit System Recovery

        2
        T1490

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Roaming\Categories:bin
          Filesize

          2.6MB

          MD5

          678c88c9fa4bd905d617530e3ed3f092

          SHA1

          f2019598e111d8833fb0a7b663e5035a3db47eac

          SHA256

          761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997

          SHA512

          aa1b26d398f273a838d6623701ba84314cc691c4bbbc51703af34ad3d5f503a66dc42fb5838e66f4e84004aaf23e29caf6113a8b17891179b62fd3d7773cde5d

        • C:\Windows\SysWOW64\Categories.exe
          Filesize

          2.6MB

          MD5

          678c88c9fa4bd905d617530e3ed3f092

          SHA1

          f2019598e111d8833fb0a7b663e5035a3db47eac

          SHA256

          761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997

          SHA512

          aa1b26d398f273a838d6623701ba84314cc691c4bbbc51703af34ad3d5f503a66dc42fb5838e66f4e84004aaf23e29caf6113a8b17891179b62fd3d7773cde5d

        • C:\Windows\SysWOW64\Categories.exe
          Filesize

          2.6MB

          MD5

          678c88c9fa4bd905d617530e3ed3f092

          SHA1

          f2019598e111d8833fb0a7b663e5035a3db47eac

          SHA256

          761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997

          SHA512

          aa1b26d398f273a838d6623701ba84314cc691c4bbbc51703af34ad3d5f503a66dc42fb5838e66f4e84004aaf23e29caf6113a8b17891179b62fd3d7773cde5d

        • \??\c:\Users\Admin\AppData\Roaming\categories:bin
          Filesize

          2.6MB

          MD5

          678c88c9fa4bd905d617530e3ed3f092

          SHA1

          f2019598e111d8833fb0a7b663e5035a3db47eac

          SHA256

          761fe7fde9899b8482bcd2a1800c442201cc866fb8e0e28969474d51fb412997

          SHA512

          aa1b26d398f273a838d6623701ba84314cc691c4bbbc51703af34ad3d5f503a66dc42fb5838e66f4e84004aaf23e29caf6113a8b17891179b62fd3d7773cde5d

        • \Users\Admin\AppData\Roaming\Categories
          Filesize

          50KB

          MD5

          7961aad46149cd5510dd405fa5de1d3f

          SHA1

          49da887be2c41821db5634672b29171ead4ed815

          SHA256

          6d7929a62323ca5fa93991bd54e37503f94a80adee49ce8347ce626bbea2a6c4

          SHA512

          6bbdd82684092ed9b986d5c49fe5631a564dec46adbb8e3c61ad5e61e43f3783b76f2e2ecb09f24f6848c8169fff3a0c781d983f368bf740d1cb1f5a796deedd

        • \Users\Admin\AppData\Roaming\Categories
          Filesize

          50KB

          MD5

          7961aad46149cd5510dd405fa5de1d3f

          SHA1

          49da887be2c41821db5634672b29171ead4ed815

          SHA256

          6d7929a62323ca5fa93991bd54e37503f94a80adee49ce8347ce626bbea2a6c4

          SHA512

          6bbdd82684092ed9b986d5c49fe5631a564dec46adbb8e3c61ad5e61e43f3783b76f2e2ecb09f24f6848c8169fff3a0c781d983f368bf740d1cb1f5a796deedd

        • memory/364-83-0x0000000000000000-mapping.dmp
        • memory/536-86-0x0000000000000000-mapping.dmp
        • memory/684-72-0x0000000000000000-mapping.dmp
        • memory/780-59-0x0000000000400000-0x0000000000A45000-memory.dmp
          Filesize

          6.3MB

        • memory/780-58-0x00000000003E0000-0x00000000003F2000-memory.dmp
          Filesize

          72KB

        • memory/780-57-0x0000000077910000-0x0000000077A90000-memory.dmp
          Filesize

          1.5MB

        • memory/780-56-0x0000000000400000-0x0000000000A45000-memory.dmp
          Filesize

          6.3MB

        • memory/780-54-0x0000000076531000-0x0000000076533000-memory.dmp
          Filesize

          8KB

        • memory/780-55-0x0000000000401000-0x0000000000403000-memory.dmp
          Filesize

          8KB

        • memory/896-79-0x0000000000000000-mapping.dmp
        • memory/908-80-0x0000000000000000-mapping.dmp
        • memory/1396-77-0x0000000077910000-0x0000000077A90000-memory.dmp
          Filesize

          1.5MB

        • memory/1396-76-0x0000000000400000-0x0000000000A45000-memory.dmp
          Filesize

          6.3MB

        • memory/1396-78-0x0000000000400000-0x0000000000A45000-memory.dmp
          Filesize

          6.3MB

        • memory/1580-69-0x0000000000400000-0x0000000000A45000-memory.dmp
          Filesize

          6.3MB

        • memory/1580-67-0x0000000000400000-0x0000000000A45000-memory.dmp
          Filesize

          6.3MB

        • memory/1580-62-0x0000000000000000-mapping.dmp
        • memory/1584-84-0x0000000000000000-mapping.dmp
        • memory/1600-82-0x0000000000000000-mapping.dmp
        • memory/1604-81-0x0000000000000000-mapping.dmp
        • memory/1644-85-0x0000000000000000-mapping.dmp
        • memory/1660-87-0x0000000000000000-mapping.dmp
        • memory/1728-68-0x0000000000000000-mapping.dmp
        • memory/1748-70-0x0000000000000000-mapping.dmp