Analysis

  • max time kernel
    167s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    20-02-2022 03:32

General

  • Target

    a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622.exe

  • Size

    208KB

  • MD5

    fb61f86d2ea604337ff2da9aaf4585c6

  • SHA1

    c5c63525bda35a317348adf7f2bd7eae9dee6de8

  • SHA256

    a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622

  • SHA512

    a8f03d7c63f974556b9c7a2ec12ddc14b7f6124f8ec74520afb0a00e124fc932f07050d1ae64d5be600d08bc5f518a7c458d5ae4813234c32e6ed6b3a982bc69

Score
10/10

Malware Config

Extracted

Path

C:\RyukReadMe.html

Family

ryuk

Ransom Note
<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> [email protected] </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html�������������������������������������������������������������������������������������������������������������������������������������������������������

Extracted

Path

C:\Documents and Settings\Admin\AppData\Local\Adobe\Acrobat\RyukReadMe.html

Family

ryuk

Ransom Note
[email protected] [email protected] balance of shadow universe Ryuk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Drops desktop.ini file(s) 34 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 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622.exe
    "C:\Users\Admin\AppData\Local\Temp\a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1548
    • C:\Windows\System32\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:648
      • C:\Windows\system32\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:972
      • C:\Windows\System32\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:848
        • C:\Windows\system32\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:1676
        • C:\Windows\System32\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:1480
          • C:\Windows\system32\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:1228
          • C:\Windows\System32\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:5012
            • C:\Windows\system32\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:5036
            • C:\Windows\System32\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:5268
              • C:\Windows\system32\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:5296
              • C:\Windows\System32\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:16756
                • C:\Windows\system32\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:16780
                • C:\Windows\System32\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                    PID:16824
                    • C:\Windows\system32\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:16856
                  • C:\Windows\system32\Dwm.exe
                    "C:\Windows\system32\Dwm.exe"
                    1⤵
                      PID:1308
                    • C:\Windows\system32\taskhost.exe
                      "taskhost.exe"
                      1⤵
                      • Drops desktop.ini file(s)
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of WriteProcessMemory
                      PID:1172
                      • C:\Windows\System32\net.exe
                        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:716
                        • C:\Windows\system32\net1.exe
                          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                          3⤵
                            PID:960
                        • C:\Windows\System32\net.exe
                          "C:\Windows\System32\net.exe" stop "samss" /y
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:1568
                          • C:\Windows\system32\net1.exe
                            C:\Windows\system32\net1 stop "samss" /y
                            3⤵
                              PID:1540
                          • C:\Windows\System32\net.exe
                            "C:\Windows\System32\net.exe" stop "samss" /y
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:5232
                            • C:\Windows\system32\net1.exe
                              C:\Windows\system32\net1 stop "samss" /y
                              3⤵
                                PID:5260
                            • C:\Windows\System32\net.exe
                              "C:\Windows\System32\net.exe" stop "samss" /y
                              2⤵
                              • Suspicious use of WriteProcessMemory
                              PID:16796
                              • C:\Windows\system32\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:16840

                            Network

                            MITRE ATT&CK Enterprise v6

                            Replay Monitor

                            Loading Replay Monitor...

                            Downloads

                            • memory/1172-56-0x000000013FA60000-0x000000013FD3C000-memory.dmp

                              Filesize

                              2.9MB

                            • memory/1172-57-0x000000013FA60000-0x000000013FD3C000-memory.dmp

                              Filesize

                              2.9MB

                            • memory/1308-59-0x000000013FA60000-0x000000013FD3C000-memory.dmp

                              Filesize

                              2.9MB

                            • memory/1548-55-0x000007FEFB5B1000-0x000007FEFB5B3000-memory.dmp

                              Filesize

                              8KB