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
    148s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    30-03-2021 11:28

Sharing

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Report Analysis Logs

General

  • Target

    41367ad447e3d86176713af7776c1ab22d5fc7fd0fe9584f14d201b9bf071700.exe

  • Size

    544KB

  • MD5

    526fa2ecb5f8fee6aec4b5d7713d909a

  • SHA1

    51aea2a2b88fb44d5b7ec5d52b47c8b83d9d724a

  • SHA256

    41367ad447e3d86176713af7776c1ab22d5fc7fd0fe9584f14d201b9bf071700

  • SHA512

    f8859f16c605622edb196f58d013058092824f3d20d207d8b0ed26d2aa4dd8d2c2d1034d5d9aa73974a605c2a41f4c569f33d43d1a6c640f2f9723c721c9e0a4

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'TyorjXA0'; $torlink = 'http://etnbhivw5fjqytbmvt2o6zle3avqn6rrugfc35kmcmedbbgqbxtknlqd.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://etnbhivw5fjqytbmvt2o6zle3avqn6rrugfc35kmcmedbbgqbxtknlqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 3 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • 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.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\41367ad447e3d86176713af7776c1ab22d5fc7fd0fe9584f14d201b9bf071700.exe
    "C:\Users\Admin\AppData\Local\Temp\41367ad447e3d86176713af7776c1ab22d5fc7fd0fe9584f14d201b9bf071700.exe"
    1⤵
    • Loads dropped DLL
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1576
    • C:\Users\Admin\AppData\Local\Temp\tqzBoMIRSrep.exe
      "C:\Users\Admin\AppData\Local\Temp\tqzBoMIRSrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1148
    • C:\Users\Admin\AppData\Local\Temp\mNXaBdQRulan.exe
      "C:\Users\Admin\AppData\Local\Temp\mNXaBdQRulan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1336
    • C:\Users\Admin\AppData\Local\Temp\pabjWwcvGlan.exe
      "C:\Users\Admin\AppData\Local\Temp\pabjWwcvGlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1584
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2640
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2652
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2792
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:284
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2992
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:2684
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3024
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3128
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3116
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3180

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/1576-3-0x0000000035000000-0x0000000035090000-memory.dmp

            Filesize

            576KB

            Download

          • memory/1576-4-0x0000000075A41000-0x0000000075A43000-memory.dmp

            Filesize

            8KB

            Download

          • memory/1576-2-0x0000000000230000-0x0000000000231000-memory.dmp

            Filesize

            4KB

            Download