Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-07-2024 08:57

General

  • Target

    881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe

  • Size

    240KB

  • MD5

    4000d4183cb34633077012e5853c52e0

  • SHA1

    8a7816c227ebbd7ad29299f7b4caba89e32dc522

  • SHA256

    881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7

  • SHA512

    375797bfca1bf017796f298943823a59160d9f932ffb6ef77e9b2da015bb7585c531964a829bcfc906a7f3ae6da1c64c6bc1dce92e99c925e5ff5dc8dd1628e4

  • SSDEEP

    3072:AdYyTQsx4c5U5Mzyy76jm5y2zvXpxgctPj1QfaYClo/cXqJBgNaCa:AdYcxDuCy8p5hpdKSUFcZ

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.

  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe
    "C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2560
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hxrfyjhd\
      2⤵
        PID:1128
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ujbinlqi.exe" C:\Windows\SysWOW64\hxrfyjhd\
        2⤵
          PID:1996
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hxrfyjhd binPath= "C:\Windows\SysWOW64\hxrfyjhd\ujbinlqi.exe /d\"C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3700
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hxrfyjhd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hxrfyjhd
          2⤵
          • Launches sc.exe
          PID:888
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:1776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2560 -s 1256
          2⤵
          • Program crash
          PID:2368
      • C:\Windows\SysWOW64\hxrfyjhd\ujbinlqi.exe
        C:\Windows\SysWOW64\hxrfyjhd\ujbinlqi.exe /d"C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3924
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4152
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3924 -s 508
          2⤵
          • Program crash
          PID:3296
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2560 -ip 2560
        1⤵
          PID:3560
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 3924 -ip 3924
          1⤵
            PID:3468

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            14.0MB

            MD5

            7a4da0b26eabea06ed93a7ecf1c14b84

            SHA1

            a35d629466ab71ffc35890031916c8eced3af660

            SHA256

            365196b264d4de097b6de9d4d9cea0bb32fc58236db28f19e1d29d3aed0f7cbb

            SHA512

            b3cc4bab345c5efe8c6b05fb69a5b893097e242eee8758f7466e6bcdca93e3202ad969ee59f074a465d56dfeebb3a7ba680684a3d6722e9812248c940ce7b5bb

          • memory/2560-2-0x00000000021B0000-0x00000000021C3000-memory.dmp
            Filesize

            76KB

          • memory/2560-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2560-9-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2560-8-0x00000000021B0000-0x00000000021C3000-memory.dmp
            Filesize

            76KB

          • memory/2560-7-0x0000000000400000-0x0000000002084000-memory.dmp
            Filesize

            28.5MB

          • memory/2560-1-0x00000000021D0000-0x00000000022D0000-memory.dmp
            Filesize

            1024KB

          • memory/3924-15-0x0000000000400000-0x0000000002084000-memory.dmp
            Filesize

            28.5MB

          • memory/4152-42-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-37-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-13-0x0000000000A30000-0x0000000000A45000-memory.dmp
            Filesize

            84KB

          • memory/4152-17-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4152-52-0x0000000002DF0000-0x0000000002DF7000-memory.dmp
            Filesize

            28KB

          • memory/4152-48-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4152-47-0x0000000002DE0000-0x0000000002DE5000-memory.dmp
            Filesize

            20KB

          • memory/4152-44-0x0000000002DE0000-0x0000000002DE5000-memory.dmp
            Filesize

            20KB

          • memory/4152-43-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-51-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4152-11-0x0000000000A30000-0x0000000000A45000-memory.dmp
            Filesize

            84KB

          • memory/4152-41-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-40-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-39-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-38-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-14-0x0000000000A30000-0x0000000000A45000-memory.dmp
            Filesize

            84KB

          • memory/4152-36-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-35-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-34-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-33-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-32-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-31-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-30-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-29-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-28-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-27-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-24-0x0000000002B10000-0x0000000002B20000-memory.dmp
            Filesize

            64KB

          • memory/4152-21-0x0000000001FF0000-0x0000000001FF6000-memory.dmp
            Filesize

            24KB

          • memory/4152-20-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB