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Overview

overview

10

Static

static

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

16af8d85ef...38.exe

windows7_x64

8

16af8d85ef...38.exe

windows10_x64

4

180f82bbed...43.exe

windows7_x64

10

180f82bbed...43.exe

windows10_x64

10

23e95ba676...7f.exe

windows7_x64

10

23e95ba676...7f.exe

windows10_x64

10

3a6ebac4f8...ca.exe

windows7_x64

10

3a6ebac4f8...ca.exe

windows10_x64

10

41367ad447...00.exe

windows7_x64

10

41367ad447...00.exe

windows10_x64

10

Analysis

  • max time kernel
    136s
  • max time network
    153s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    29/03/2021, 12:47

Sharing

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General

  • Target

    23e95ba67603234352ff2864dc7fa54742f501e5922f01f8c182dbefc116f97f.exe

  • Size

    121KB

  • MD5

    7364f6222ac58896e8920f32e4d30aac

  • SHA1

    915fd6fb4e20909025f876f3bb453ec52e21b7be

  • SHA256

    23e95ba67603234352ff2864dc7fa54742f501e5922f01f8c182dbefc116f97f

  • SHA512

    f5e2b5a17ed04c7edb904e867cec2f66a59b887176bd3e25803e82a390fc36fc47002df747099ca4e6960f020afe1137f4ba24b28613423b5de0b09ff7048026

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'RCCF8gd'; $torlink = 'http://rdmnobnbtxh5sm3iiczazaregkpyyub3gktwneeehx62tyot5bc4qhad.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://rdmnobnbtxh5sm3iiczazaregkpyyub3gktwneeehx62tyot5bc4qhad.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
  • 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 4 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\23e95ba67603234352ff2864dc7fa54742f501e5922f01f8c182dbefc116f97f.exe
    "C:\Users\Admin\AppData\Local\Temp\23e95ba67603234352ff2864dc7fa54742f501e5922f01f8c182dbefc116f97f.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:508
    • C:\Users\Admin\AppData\Local\Temp\XPGFarKIPrep.exe
      "C:\Users\Admin\AppData\Local\Temp\XPGFarKIPrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:3596
    • C:\Users\Admin\AppData\Local\Temp\HVYKHKfoTlan.exe
      "C:\Users\Admin\AppData\Local\Temp\HVYKHKfoTlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:3164
    • C:\Users\Admin\AppData\Local\Temp\QPiaXNfqmlan.exe
      "C:\Users\Admin\AppData\Local\Temp\QPiaXNfqmlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:4448
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4548
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4560
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4776
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:4708
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:5040
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:4728
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:5032
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:4736
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4824
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:4748

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/508-12-0x0000000002DE0000-0x0000000002DE1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/508-13-0x00000000035E0000-0x00000000035E1000-memory.dmp

            Filesize

            4KB

            Download