Analysis

  • max time kernel
    37s
  • max time network
    125s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    26-07-2021 12:42

General

  • Target

    5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.sample.exe

  • Size

    1.0MB

  • MD5

    572fea5f025df78f2d316216fbeee52e

  • SHA1

    91b2bf44b1f9282c09f07f16631deaa3ad9d956d

  • SHA256

    5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367

  • SHA512

    eb238272227c5825477ff1e37dc4f7e467665049d4db5649fff59c39d7745e88b06234d6d1218c05c802e33e21577f9d4a533cb9e23ebe6fb09654f97759c187

Malware Config

Signatures

  • WastedLocker

    Ransomware family seen in the wild since May 2020.

  • CryptOne packer 4 IoCs

    Detects CryptOne packer defined in NCC blogpost.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 2 IoCs
  • Modifies extensions of user files 30 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Possible privilege escalation attempt 2 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Drops file in System32 directory 2 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 38 IoCs
  • Views/modifies file attributes 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.sample.exe"
    1⤵
    • NTFS ADS
    • Suspicious use of WriteProcessMemory
    PID:656
    • C:\Users\Admin\AppData\Roaming\D80:bin
      C:\Users\Admin\AppData\Roaming\D80:bin -r
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:4068
      • C:\Windows\system32\vssadmin.exe
        C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:3484
      • C:\Windows\SysWOW64\takeown.exe
        C:\Windows\system32\takeown.exe /F C:\Windows\system32\D80.exe
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:2784
      • C:\Windows\SysWOW64\icacls.exe
        C:\Windows\system32\icacls.exe C:\Windows\system32\D80.exe /reset
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:3052
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\D80" & del "C:\Users\Admin\AppData\Roaming\D80"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2308
        • C:\Windows\SysWOW64\choice.exe
          choice /t 10 /d y
          4⤵
            PID:3708
          • C:\Windows\SysWOW64\attrib.exe
            attrib -h "C:\Users\Admin\AppData\Roaming\D80"
            4⤵
            • Views/modifies file attributes
            PID:3728
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.sample.exe" & del "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.sample.exe"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2144
        • C:\Windows\SysWOW64\choice.exe
          choice /t 10 /d y
          3⤵
            PID:3496
          • C:\Windows\SysWOW64\attrib.exe
            attrib -h "C:\Users\Admin\AppData\Local\Temp\5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367.sample.exe"
            3⤵
            • Views/modifies file attributes
            PID:264
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4016
      • C:\Windows\SysWOW64\D80.exe
        C:\Windows\SysWOW64\D80.exe -s
        1⤵
        • Executes dropped EXE
        • Modifies extensions of user files
        • Suspicious use of WriteProcessMemory
        PID:2276
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\D80.exe" & del "C:\Windows\SysWOW64\D80.exe"
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2100
          • C:\Windows\SysWOW64\choice.exe
            choice /t 10 /d y
            3⤵
              PID:904
            • C:\Windows\SysWOW64\attrib.exe
              attrib -h "C:\Windows\SysWOW64\D80.exe"
              3⤵
              • Drops file in System32 directory
              • Views/modifies file attributes
              PID:3192

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Persistence

        Hidden Files and Directories

        1
        T1158

        Defense Evasion

        File Deletion

        2
        T1107

        File Permissions Modification

        1
        T1222

        Hidden Files and Directories

        1
        T1158

        Impact

        Inhibit System Recovery

        2
        T1490

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Roaming\D80:bin
          MD5

          572fea5f025df78f2d316216fbeee52e

          SHA1

          91b2bf44b1f9282c09f07f16631deaa3ad9d956d

          SHA256

          5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367

          SHA512

          eb238272227c5825477ff1e37dc4f7e467665049d4db5649fff59c39d7745e88b06234d6d1218c05c802e33e21577f9d4a533cb9e23ebe6fb09654f97759c187

        • C:\Users\Admin\AppData\Roaming\D80:bin
          MD5

          572fea5f025df78f2d316216fbeee52e

          SHA1

          91b2bf44b1f9282c09f07f16631deaa3ad9d956d

          SHA256

          5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367

          SHA512

          eb238272227c5825477ff1e37dc4f7e467665049d4db5649fff59c39d7745e88b06234d6d1218c05c802e33e21577f9d4a533cb9e23ebe6fb09654f97759c187

        • C:\Windows\SysWOW64\D80.exe
          MD5

          572fea5f025df78f2d316216fbeee52e

          SHA1

          91b2bf44b1f9282c09f07f16631deaa3ad9d956d

          SHA256

          5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367

          SHA512

          eb238272227c5825477ff1e37dc4f7e467665049d4db5649fff59c39d7745e88b06234d6d1218c05c802e33e21577f9d4a533cb9e23ebe6fb09654f97759c187

        • C:\Windows\SysWOW64\D80.exe
          MD5

          572fea5f025df78f2d316216fbeee52e

          SHA1

          91b2bf44b1f9282c09f07f16631deaa3ad9d956d

          SHA256

          5cd04805f9753ca08b82e88c27bf5426d1d356bb26b281885573051048911367

          SHA512

          eb238272227c5825477ff1e37dc4f7e467665049d4db5649fff59c39d7745e88b06234d6d1218c05c802e33e21577f9d4a533cb9e23ebe6fb09654f97759c187

        • memory/264-135-0x0000000000000000-mapping.dmp
        • memory/656-114-0x0000000000560000-0x00000000006AA000-memory.dmp
          Filesize

          1.3MB

        • memory/656-115-0x0000000000400000-0x0000000000507000-memory.dmp
          Filesize

          1.0MB

        • memory/904-130-0x0000000000000000-mapping.dmp
        • memory/2100-127-0x0000000000000000-mapping.dmp
        • memory/2144-129-0x0000000000000000-mapping.dmp
        • memory/2276-125-0x00000000001E0000-0x00000000001F0000-memory.dmp
          Filesize

          64KB

        • memory/2276-126-0x0000000000400000-0x0000000000507000-memory.dmp
          Filesize

          1.0MB

        • memory/2308-128-0x0000000000000000-mapping.dmp
        • memory/2784-121-0x0000000000000000-mapping.dmp
        • memory/3052-123-0x0000000000000000-mapping.dmp
        • memory/3192-133-0x0000000000000000-mapping.dmp
        • memory/3484-119-0x0000000000000000-mapping.dmp
        • memory/3496-132-0x0000000000000000-mapping.dmp
        • memory/3708-131-0x0000000000000000-mapping.dmp
        • memory/3728-134-0x0000000000000000-mapping.dmp
        • memory/4068-120-0x0000000000400000-0x0000000000507000-memory.dmp
          Filesize

          1.0MB

        • memory/4068-116-0x0000000000000000-mapping.dmp