Analysis

  • max time kernel
    144s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-05-2024 04:25

General

  • Target

    a6c7dd82eace106350d20d93956360e6.exe

  • Size

    178KB

  • MD5

    a6c7dd82eace106350d20d93956360e6

  • SHA1

    19c5ea0607b527e4c2b08a39583db38f503933e0

  • SHA256

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f

  • SHA512

    6e3d950e1a16103710985e9e0993f26ece5f7d67eadbd711941e826117d0d884624ddf166d3a70e25453518bb2f7d9a9c2dede25f6785dcb24d6031ba29c419e

  • SSDEEP

    1536:DAc76NGJEzLoCPMkXzxIGzA9aRmNjo/Phcnr6xMtxUtoIlESP5tA9bDQqpN+X:D7kXzxIGzA9aUo/PhcnVHUtoe5K9

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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe
    "C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2372
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dnebpppr\
      2⤵
        PID:3968
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vpphkuyk.exe" C:\Windows\SysWOW64\dnebpppr\
        2⤵
          PID:3568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dnebpppr binPath= "C:\Windows\SysWOW64\dnebpppr\vpphkuyk.exe /d\"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dnebpppr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1304
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dnebpppr
          2⤵
          • Launches sc.exe
          PID:2448
        • 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:4056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2372 -s 664
          2⤵
          • Program crash
          PID:4884
      • C:\Windows\SysWOW64\dnebpppr\vpphkuyk.exe
        C:\Windows\SysWOW64\dnebpppr\vpphkuyk.exe /d"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1556
        • 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:560
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1556 -s 532
          2⤵
          • Program crash
          PID:3836
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1556 -ip 1556
        1⤵
          PID:4924
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 2372 -ip 2372
          1⤵
            PID:3232

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.2MB

            MD5

            c6839008544bc46a02e54c79e3fc6436

            SHA1

            0bc3dade4b5de8ba37ccbb2cf2ef1ffe320b1ee8

            SHA256

            cb1df06d8cf9d132f6f4c407279d3107d670168807e2f8c0c88de2149e41a51c

            SHA512

            9c433986958ce23d098f00b499f103ee22a77a080f477a1491aed5c87b9fcf00d237428f963ad73cac1124164929bb8951df5540038cf2a49fb93485acca977b

          • memory/560-41-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-8-0x00000000009C0000-0x00000000009D5000-memory.dmp

            Filesize

            84KB

          • memory/560-42-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-18-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/560-38-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/560-21-0x0000000001F70000-0x0000000001F76000-memory.dmp

            Filesize

            24KB

          • memory/560-24-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-14-0x00000000009C0000-0x00000000009D5000-memory.dmp

            Filesize

            84KB

          • memory/560-15-0x00000000009C0000-0x00000000009D5000-memory.dmp

            Filesize

            84KB

          • memory/560-52-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

            Filesize

            28KB

          • memory/560-51-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/560-48-0x0000000007800000-0x0000000007C0B000-memory.dmp

            Filesize

            4.0MB

          • memory/560-47-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

            Filesize

            20KB

          • memory/560-44-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

            Filesize

            20KB

          • memory/560-43-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-27-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-40-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-28-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-39-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-37-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-36-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-35-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-34-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-33-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-32-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-31-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-30-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/560-29-0x0000000001F80000-0x0000000001F90000-memory.dmp

            Filesize

            64KB

          • memory/1556-10-0x0000000000400000-0x0000000002349000-memory.dmp

            Filesize

            31.3MB

          • memory/2372-3-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/2372-2-0x00000000024B0000-0x00000000024C3000-memory.dmp

            Filesize

            76KB

          • memory/2372-11-0x0000000000400000-0x0000000002349000-memory.dmp

            Filesize

            31.3MB

          • memory/2372-12-0x00000000024B0000-0x00000000024C3000-memory.dmp

            Filesize

            76KB

          • memory/2372-13-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/2372-1-0x0000000002520000-0x0000000002620000-memory.dmp

            Filesize

            1024KB