Overview

overview

10

Static

static

8f368b029a...8a.exe

windows10_x64

10

Analysis

  • max time kernel
    181s
  • max time network
    311s
  • platform
    windows10_x64
  • resource
    win10-en-20210920
  • submitted
    20-10-2021 12:46

Sharing

Copy URL
Twitter E-mail
Report Analysis Logs

General

  • Target

    8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a.exe

  • Size

    144KB

  • MD5

    89895cf4c88f13e5797aab63dddf1078

  • SHA1

    1efc175983a17bd6c562fe7b054045d6dcb341e5

  • SHA256

    8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a

  • SHA512

    d238fa264ad931ed43798a65f01cbe1d044300dbe5312bdcef8540f2757079514daae27f30f2369b7b811a3273c961f9fd38e7ae5010c11120c83906e8c102e2

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'UWUEbcQLr'; $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 extensions of user files 5 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Drops startup file 1 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

    persistence
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 49 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 56 IoCs
  • Suspicious use of SendNotifyMessage 56 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a.exe
    "C:\Users\Admin\AppData\Local\Temp\8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a.exe"
    1⤵
    • Modifies extensions of user files
    • Drops startup file
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3704
    • C:\Users\Admin\AppData\Local\Temp\1073r.exe
      "C:\Users\Admin\AppData\Local\Temp\1073r.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:372
    • C:\Users\Admin\AppData\Local\Temp\fvOOUhBaClan.exe
      "C:\Users\Admin\AppData\Local\Temp\fvOOUhBaClan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1032
    • C:\Users\Admin\AppData\Local\Temp\IEwuQeDAslan.exe
      "C:\Users\Admin\AppData\Local\Temp\IEwuQeDAslan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1232
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4688
    • 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⤵
      • Suspicious use of WriteProcessMemory
      PID:4176
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:4900
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4920
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:1340
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2336
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:4836
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4644
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:2608
            • C:\Windows\SysWOW64\SCHTASKS.exe
              SCHTASKS /CREATE /NP /SC DAILY /TN "Prints1" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\g2o9m.dll" /ST 10:25 /SD 10/21/2021 /ED 10/28/2021
              2⤵
              • Creates scheduled task(s)
              PID:4768
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
                PID:8732
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:9028
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                    PID:8740
                    • C:\Windows\SysWOW64\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:9016
                  • C:\Windows\system32\taskmgr.exe
                    "C:\Windows\system32\taskmgr.exe" /4
                    1⤵
                    • Drops file in Windows directory
                    • Checks SCSI registry key(s)
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of FindShellTrayWindow
                    • Suspicious use of SendNotifyMessage
                    PID:4248

                  Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

                  Loading Replay Monitor...

                  Downloads