Analysis

  • max time kernel
    27s
  • max time network
    80s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    26-07-2021 12:42

General

  • Target

    905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a.sample.exe

  • Size

    1.2MB

  • MD5

    2cc4534b0dd0e1c8d5b89644274a10c1

  • SHA1

    735ee2c15c0b7172f65d39f0fd33b9186ee69653

  • SHA256

    905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a

  • SHA512

    a842b2d171aa6efa1b391d5d0f84663e78021b485555e2bf10a5e589d8652057f5abbd88e1a5ec628b714692ec5d63c3172894aa7846d5897e87d99dad67e2b8

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 33 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\905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a.sample.exe"
    1⤵
    • NTFS ADS
    • Suspicious use of WriteProcessMemory
    PID:808
    • C:\Users\Admin\AppData\Roaming\Drivers:bin
      C:\Users\Admin\AppData\Roaming\Drivers:bin -r
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:3252
      • C:\Windows\system32\vssadmin.exe
        C:\Windows\system32\vssadmin.exe Delete Shadows /All /Quiet
        3⤵
        • Interacts with shadow copies
        PID:3064
      • C:\Windows\SysWOW64\takeown.exe
        C:\Windows\system32\takeown.exe /F C:\Windows\system32\Drivers.exe
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:2924
      • C:\Windows\SysWOW64\icacls.exe
        C:\Windows\system32\icacls.exe C:\Windows\system32\Drivers.exe /reset
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:3888
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Roaming\Drivers" & del "C:\Users\Admin\AppData\Roaming\Drivers"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4060
        • C:\Windows\SysWOW64\choice.exe
          choice /t 10 /d y
          4⤵
            PID:3108
          • C:\Windows\SysWOW64\attrib.exe
            attrib -h "C:\Users\Admin\AppData\Roaming\Drivers"
            4⤵
            • Views/modifies file attributes
            PID:280
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c choice /t 10 /d y & attrib -h "C:\Users\Admin\AppData\Local\Temp\905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a.sample.exe" & del "C:\Users\Admin\AppData\Local\Temp\905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a.sample.exe"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3032
        • C:\Windows\SysWOW64\choice.exe
          choice /t 10 /d y
          3⤵
            PID:4088
          • C:\Windows\SysWOW64\attrib.exe
            attrib -h "C:\Users\Admin\AppData\Local\Temp\905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a.sample.exe"
            3⤵
            • Views/modifies file attributes
            PID:2716
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2884
      • C:\Windows\SysWOW64\Drivers.exe
        C:\Windows\SysWOW64\Drivers.exe -s
        1⤵
        • Executes dropped EXE
        • Modifies extensions of user files
        • Suspicious use of WriteProcessMemory
        PID:2664
        • C:\Windows\SysWOW64\cmd.exe
          cmd /c choice /t 10 /d y & attrib -h "C:\Windows\SysWOW64\Drivers.exe" & del "C:\Windows\SysWOW64\Drivers.exe"
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3832
          • C:\Windows\SysWOW64\choice.exe
            choice /t 10 /d y
            3⤵
              PID:3992
            • C:\Windows\SysWOW64\attrib.exe
              attrib -h "C:\Windows\SysWOW64\Drivers.exe"
              3⤵
              • Drops file in System32 directory
              • Views/modifies file attributes
              PID:264

        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\Drivers:bin
          MD5

          2cc4534b0dd0e1c8d5b89644274a10c1

          SHA1

          735ee2c15c0b7172f65d39f0fd33b9186ee69653

          SHA256

          905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a

          SHA512

          a842b2d171aa6efa1b391d5d0f84663e78021b485555e2bf10a5e589d8652057f5abbd88e1a5ec628b714692ec5d63c3172894aa7846d5897e87d99dad67e2b8

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

          2cc4534b0dd0e1c8d5b89644274a10c1

          SHA1

          735ee2c15c0b7172f65d39f0fd33b9186ee69653

          SHA256

          905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a

          SHA512

          a842b2d171aa6efa1b391d5d0f84663e78021b485555e2bf10a5e589d8652057f5abbd88e1a5ec628b714692ec5d63c3172894aa7846d5897e87d99dad67e2b8

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

          2cc4534b0dd0e1c8d5b89644274a10c1

          SHA1

          735ee2c15c0b7172f65d39f0fd33b9186ee69653

          SHA256

          905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a

          SHA512

          a842b2d171aa6efa1b391d5d0f84663e78021b485555e2bf10a5e589d8652057f5abbd88e1a5ec628b714692ec5d63c3172894aa7846d5897e87d99dad67e2b8

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

          2cc4534b0dd0e1c8d5b89644274a10c1

          SHA1

          735ee2c15c0b7172f65d39f0fd33b9186ee69653

          SHA256

          905ea119ad8d3e54cd228c458a1b5681abc1f35df782977a23812ec4efa0288a

          SHA512

          a842b2d171aa6efa1b391d5d0f84663e78021b485555e2bf10a5e589d8652057f5abbd88e1a5ec628b714692ec5d63c3172894aa7846d5897e87d99dad67e2b8

        • memory/264-133-0x0000000000000000-mapping.dmp
        • memory/280-134-0x0000000000000000-mapping.dmp
        • memory/808-115-0x0000000000400000-0x0000000000534000-memory.dmp
          Filesize

          1.2MB

        • memory/808-114-0x0000000000590000-0x00000000005A0000-memory.dmp
          Filesize

          64KB

        • memory/2664-126-0x0000000000400000-0x0000000000534000-memory.dmp
          Filesize

          1.2MB

        • memory/2716-135-0x0000000000000000-mapping.dmp
        • memory/2924-122-0x0000000000000000-mapping.dmp
        • memory/3032-130-0x0000000000000000-mapping.dmp
        • memory/3064-119-0x0000000000000000-mapping.dmp
        • memory/3108-131-0x0000000000000000-mapping.dmp
        • memory/3252-121-0x0000000000400000-0x0000000000534000-memory.dmp
          Filesize

          1.2MB

        • memory/3252-120-0x0000000000540000-0x000000000068A000-memory.dmp
          Filesize

          1.3MB

        • memory/3252-116-0x0000000000000000-mapping.dmp
        • memory/3832-127-0x0000000000000000-mapping.dmp
        • memory/3888-124-0x0000000000000000-mapping.dmp
        • memory/3992-128-0x0000000000000000-mapping.dmp
        • memory/4060-129-0x0000000000000000-mapping.dmp
        • memory/4088-132-0x0000000000000000-mapping.dmp