Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:34

General

  • Target

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe

  • Size

    227KB

  • MD5

    1010b86bd744c31ecef5f5aeae5ca6df

  • SHA1

    79dbaab22a85e8a0c3124d39423da1ca24c358e8

  • SHA256

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de

  • SHA512

    6823068623029c10aa0d833be8422b6d93663832d24298bd9811f7700bbc56dc5463fd75f12273e2168bac6784a16e735cc86cf0de8841e83c1befc75bdfd02d

  • SSDEEP

    3072:BG/VLLNVnlMoDjq0sg0lpb15L76ZhBUrIeGskK+KgPcf53whT5A/hTu:8Lh9ljdOlPB6tUrIK+zPcRaCpT

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) 1 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 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe
    "C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dhiqkqt\
      2⤵
        PID:1084
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cwworbfr.exe" C:\Windows\SysWOW64\dhiqkqt\
        2⤵
          PID:4208
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dhiqkqt binPath= "C:\Windows\SysWOW64\dhiqkqt\cwworbfr.exe /d\"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dhiqkqt "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4612
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dhiqkqt
          2⤵
          • Launches sc.exe
          PID:4080
        • 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:1728
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3648 -s 572
          2⤵
          • Program crash
          PID:2228
      • C:\Windows\SysWOW64\dhiqkqt\cwworbfr.exe
        C:\Windows\SysWOW64\dhiqkqt\cwworbfr.exe /d"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3804
        • 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:5116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3804 -s 516
          2⤵
          • Program crash
          PID:2360
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3804 -ip 3804
        1⤵
          PID:2388
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3648 -ip 3648
          1⤵
            PID:4008

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.6MB

            MD5

            52428e543003fb5ac2ae09220b2b8d70

            SHA1

            cc0b11dddf1c51b8b34ba73ec9bc274bad77ab90

            SHA256

            0ddda582758cf771087118d758eabe59553ae2fe6430d917ebe364de20cc9032

            SHA512

            3c78424c1c66efe2a00f7066610e6e9875fe81fc42a27582181dc825a85d42fcd8d232e463410f303100e17fa57c46c7055343aa41f5c29bb62fb5a12f62f338

          • memory/3648-1-0x0000000002CB0000-0x0000000002DB0000-memory.dmp

            Filesize

            1024KB

          • memory/3648-2-0x0000000002C80000-0x0000000002C93000-memory.dmp

            Filesize

            76KB

          • memory/3648-4-0x0000000000400000-0x0000000002B11000-memory.dmp

            Filesize

            39.1MB

          • memory/3648-16-0x0000000000400000-0x0000000002B11000-memory.dmp

            Filesize

            39.1MB

          • memory/3804-9-0x0000000002EA0000-0x0000000002EB3000-memory.dmp

            Filesize

            76KB

          • memory/3804-13-0x0000000000400000-0x0000000002B11000-memory.dmp

            Filesize

            39.1MB

          • memory/3804-15-0x0000000000400000-0x0000000002B11000-memory.dmp

            Filesize

            39.1MB

          • memory/3804-8-0x0000000002C30000-0x0000000002D30000-memory.dmp

            Filesize

            1024KB

          • memory/5116-10-0x00000000006B0000-0x00000000006C5000-memory.dmp

            Filesize

            84KB

          • memory/5116-14-0x00000000006B0000-0x00000000006C5000-memory.dmp

            Filesize

            84KB

          • memory/5116-17-0x00000000006B0000-0x00000000006C5000-memory.dmp

            Filesize

            84KB

          • memory/5116-18-0x00000000006B0000-0x00000000006C5000-memory.dmp

            Filesize

            84KB

          • memory/5116-20-0x00000000006B0000-0x00000000006C5000-memory.dmp

            Filesize

            84KB