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Analysis

  • max time kernel
    167s
  • max time network
    180s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/10/2023, 09:19

General

  • Target

    file.exe

  • Size

    334KB

  • MD5

    326c87f0f560c113b40c81b5ce323446

  • SHA1

    89e1888d493b6bba3f419d93cc1ea5baead3ab99

  • SHA256

    551b111c31fac62a31b4621971488f645e4d24b709c1989a993f6c3a5b0091ee

  • SHA512

    e38705e915f7e3c4a18229856162782040e84e986e1ed67f282a28be2d9de7b4d988caf975125170c23c88133f90fb4e28fb39538aee3ebaab452dab54789060

  • SSDEEP

    3072:e0dFL6r3o6iqLCJTWqN/nqUQuGtQc6FHbTtMM0HIb4RINRC2No:lFLu3BiqLtqpn1RFxMM+Ib56

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 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.

  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ymmmcten\
      2⤵
        PID:1384
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqqnzlbz.exe" C:\Windows\SysWOW64\ymmmcten\
        2⤵
          PID:3704
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ymmmcten binPath= "C:\Windows\SysWOW64\ymmmcten\aqqnzlbz.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ymmmcten "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2568
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ymmmcten
          2⤵
          • Launches sc.exe
          PID:4352
        • 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:1196
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1916 -s 1036
          2⤵
          • Program crash
          PID:8
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 1916 -ip 1916
        1⤵
          PID:3320
        • C:\Windows\SysWOW64\ymmmcten\aqqnzlbz.exe
          C:\Windows\SysWOW64\ymmmcten\aqqnzlbz.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4992
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Drops file in System32 directory
            • Modifies data under HKEY_USERS
            PID:4680
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4992 -s 512
            2⤵
            • Program crash
            PID:2220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4992 -ip 4992
          1⤵
            PID:4880

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.9MB

            MD5

            0974ed70deb82a69e6e19d354f7b78d6

            SHA1

            719f16a51ac56f6fe9180599ed19d47e7e7d5a62

            SHA256

            957af998eefe90724db3eb59673936039f6edb8cc2763f524ab477de3f8a4628

            SHA512

            53fc39fc6979db5959f20b0dd9e1ada1ab6669047c4b5e98f29d84c31d6d687119314234860c2723a07988c3df660603a551ad2441ed6a8413235e341daef7bd

          • C:\Windows\SysWOW64\ymmmcten\aqqnzlbz.exe

            Filesize

            12.9MB

            MD5

            0974ed70deb82a69e6e19d354f7b78d6

            SHA1

            719f16a51ac56f6fe9180599ed19d47e7e7d5a62

            SHA256

            957af998eefe90724db3eb59673936039f6edb8cc2763f524ab477de3f8a4628

            SHA512

            53fc39fc6979db5959f20b0dd9e1ada1ab6669047c4b5e98f29d84c31d6d687119314234860c2723a07988c3df660603a551ad2441ed6a8413235e341daef7bd

          • memory/1916-20-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/1916-2-0x0000000002710000-0x0000000002723000-memory.dmp

            Filesize

            76KB

          • memory/1916-3-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/1916-5-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/1916-6-0x00000000027D0000-0x00000000028D0000-memory.dmp

            Filesize

            1024KB

          • memory/1916-7-0x0000000002710000-0x0000000002723000-memory.dmp

            Filesize

            76KB

          • memory/1916-8-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/1916-1-0x00000000027D0000-0x00000000028D0000-memory.dmp

            Filesize

            1024KB

          • memory/4680-48-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-42-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-19-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-15-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-62-0x00000000025D0000-0x00000000025D7000-memory.dmp

            Filesize

            28KB

          • memory/4680-23-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-24-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-26-0x0000000000190000-0x00000000001A5000-memory.dmp

            Filesize

            84KB

          • memory/4680-27-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/4680-30-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/4680-31-0x00000000003F0000-0x00000000003F6000-memory.dmp

            Filesize

            24KB

          • memory/4680-34-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-38-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-37-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-39-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-40-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-41-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-61-0x0000000007100000-0x000000000750B000-memory.dmp

            Filesize

            4.0MB

          • memory/4680-43-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-46-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-44-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-47-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-45-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-50-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-49-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-52-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-51-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-53-0x00000000017A0000-0x00000000017B0000-memory.dmp

            Filesize

            64KB

          • memory/4680-58-0x0000000007100000-0x000000000750B000-memory.dmp

            Filesize

            4.0MB

          • memory/4680-57-0x00000000017F0000-0x00000000017F5000-memory.dmp

            Filesize

            20KB

          • memory/4680-54-0x00000000017F0000-0x00000000017F5000-memory.dmp

            Filesize

            20KB

          • memory/4992-14-0x0000000002600000-0x0000000002700000-memory.dmp

            Filesize

            1024KB

          • memory/4992-16-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB

          • memory/4992-21-0x0000000000400000-0x00000000025A6000-memory.dmp

            Filesize

            33.6MB