Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19-07-2024 21:04

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 6 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:3084
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vynfnhkm\
      2⤵
        PID:1076
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jhwexnie.exe" C:\Windows\SysWOW64\vynfnhkm\
        2⤵
          PID:1792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vynfnhkm binPath= "C:\Windows\SysWOW64\vynfnhkm\jhwexnie.exe /d\"C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vynfnhkm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vynfnhkm
          2⤵
          • Launches sc.exe
          PID:3796
        • 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:4824
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3084 -s 1148
          2⤵
          • Program crash
          PID:3272
      • C:\Windows\SysWOW64\vynfnhkm\jhwexnie.exe
        C:\Windows\SysWOW64\vynfnhkm\jhwexnie.exe /d"C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3496
        • 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:4512
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3496 -s 532
          2⤵
          • Program crash
          PID:2836
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 3084 -ip 3084
        1⤵
          PID:2484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 3496 -ip 3496
          1⤵
            PID:2820

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            12.0MB

            MD5

            d99c0d917dcbd2a36200530c5c2e6993

            SHA1

            11c555b026a407be774abb7fafa8b7b6f72f33d8

            SHA256

            b8726b02d0d66264b3b31907bc6d4ad8b208a693c0580859dfe4512497ab5a89

            SHA512

            5308eca7fa32e05664698f2a3841bb86aa16887bfc16c524ad62ef74e513da89f744b0becece1aa0ef0624884d6f2d255807a0086238756789c8ed5bfb4f404e

          • memory/3084-2-0x0000000003DD0000-0x0000000003DE3000-memory.dmp
            Filesize

            76KB

          • memory/3084-3-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3084-9-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3084-8-0x0000000003DD0000-0x0000000003DE3000-memory.dmp
            Filesize

            76KB

          • memory/3084-7-0x0000000000400000-0x0000000002084000-memory.dmp
            Filesize

            28.5MB

          • memory/3084-1-0x0000000002220000-0x0000000002320000-memory.dmp
            Filesize

            1024KB

          • memory/3496-15-0x0000000000400000-0x0000000002084000-memory.dmp
            Filesize

            28.5MB

          • memory/4512-42-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-36-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-14-0x0000000000F80000-0x0000000000F95000-memory.dmp
            Filesize

            84KB

          • memory/4512-21-0x0000000002530000-0x0000000002536000-memory.dmp
            Filesize

            24KB

          • memory/4512-48-0x0000000007D80000-0x000000000818B000-memory.dmp
            Filesize

            4.0MB

          • memory/4512-52-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/4512-51-0x0000000007D80000-0x000000000818B000-memory.dmp
            Filesize

            4.0MB

          • memory/4512-47-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/4512-44-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/4512-43-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-13-0x0000000000F80000-0x0000000000F95000-memory.dmp
            Filesize

            84KB

          • memory/4512-41-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-40-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-38-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-37-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-11-0x0000000000F80000-0x0000000000F95000-memory.dmp
            Filesize

            84KB

          • memory/4512-35-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-34-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-33-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-32-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-31-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-30-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-29-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-27-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-24-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4512-18-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4512-39-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB

          • memory/4512-28-0x0000000002540000-0x0000000002550000-memory.dmp
            Filesize

            64KB