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Overview

overview

10

Static

static

8

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Ryuk

windows7_x64

10

Analysis

  • max time kernel
    183s
  • max time network
    303s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    23/04/2021, 11:24

Sharing

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Report Analysis Logs

General

  • Target

    2b10ad4890c4d6e2861533cc7260a9fdc7871ea2.exe

  • Size

    157KB

  • MD5

    c1da496d8ab64225db031361a3f265a3

  • SHA1

    2b10ad4890c4d6e2861533cc7260a9fdc7871ea2

  • SHA256

    c4bd712a7f7185a2224806b85f3c6ac48de067e38d554608b3ee92422d902b28

  • SHA512

    8ead9423e31cdee8388704d7b38a9c6d4b33a9d09e729b73c70c69d5e4e09ad0fcb192dd866a1cf0a9283e099bd7d44ecb75607b63e5e5dcffc087cd60b5a047

Score
10/10
ryukdiscoveryransomwareupx

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'ky0SRjh'; $torlink = 'http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • UPX packed file 9 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

    upx
  • Loads dropped DLL 6 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 54 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2b10ad4890c4d6e2861533cc7260a9fdc7871ea2.exe
    "C:\Users\Admin\AppData\Local\Temp\2b10ad4890c4d6e2861533cc7260a9fdc7871ea2.exe"
    1⤵
    • Loads dropped DLL
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1088
    • C:\Users\Admin\AppData\Local\Temp\LpWzDBJkRrep.exe
      "C:\Users\Admin\AppData\Local\Temp\LpWzDBJkRrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1600
    • C:\Users\Admin\AppData\Local\Temp\zhmkDBNZClan.exe
      "C:\Users\Admin\AppData\Local\Temp\zhmkDBNZClan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:268
    • C:\Users\Admin\AppData\Local\Temp\CjlQNnSqslan.exe
      "C:\Users\Admin\AppData\Local\Temp\CjlQNnSqslan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:472
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:528
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1436
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
        PID:2196
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:2308
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
            PID:2184
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "audioendpointbuilder" /y
              3⤵
                PID:2300
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
                PID:2252
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:2364
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                    PID:2232
                  • C:\Windows\SysWOW64\net.exe
                    "C:\Windows\System32\net.exe" stop "samss" /y
                    2⤵
                      PID:1540
                      • C:\Windows\SysWOW64\net1.exe
                        C:\Windows\system32\net1 stop "samss" /y
                        3⤵
                          PID:2296
                      • C:\Windows\SysWOW64\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                          PID:1760
                          • C:\Windows\SysWOW64\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:1664
                        • C:\Windows\SysWOW64\net1.exe
                          C:\Windows\system32\net1 stop "samss" /y
                          1⤵
                            PID:2328

                          Network

                          MITRE ATT&CK Enterprise v6

                          Replay Monitor

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                          Downloads

                          • memory/268-74-0x0000000035000000-0x0000000035432000-memory.dmp

                            Filesize

                            4.2MB

                            Download

                          • memory/472-80-0x0000000035000000-0x0000000035432000-memory.dmp

                            Filesize

                            4.2MB

                            Download

                          • memory/1088-60-0x00000000001D0000-0x00000000001F4000-memory.dmp

                            Filesize

                            144KB

                            Download

                          • memory/1088-61-0x0000000035000000-0x0000000035432000-memory.dmp

                            Filesize

                            4.2MB

                            Download

                          • memory/1088-62-0x00000000753B1000-0x00000000753B3000-memory.dmp

                            Filesize

                            8KB

                            Download

                          • memory/1600-68-0x0000000035000000-0x0000000035432000-memory.dmp

                            Filesize

                            4.2MB

                            Download