Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/11/2023, 09:19

General

  • Target

    446fec896bd9a5d0bffb8939a709229d70698d7b5b05676f624a8b7378ac512f.exe

  • Size

    256KB

  • MD5

    f9b13ef761c69618b2c99e1f4a2adaa1

  • SHA1

    77af673725cd8a50356b5cb4a0aba0a2cbc65be3

  • SHA256

    446fec896bd9a5d0bffb8939a709229d70698d7b5b05676f624a8b7378ac512f

  • SHA512

    7d78c5fe458e4b9fdaea5adb5fd298f68fb4857e8b31867a09640fe58f820b251645058a6366fc5a7b8f3e4d096ee24b4553f947b1cb51cdc48c4e7e20ee9415

  • SSDEEP

    6144:dclJj1ofwtR7piuA9qKhsv2Yl4vyqv/+nc3+K2Ho:qX1ofEdAi4Hv/och

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.

  • 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
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\446fec896bd9a5d0bffb8939a709229d70698d7b5b05676f624a8b7378ac512f.exe
    "C:\Users\Admin\AppData\Local\Temp\446fec896bd9a5d0bffb8939a709229d70698d7b5b05676f624a8b7378ac512f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2768
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pkchgxa\
      2⤵
        PID:1188
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ahgtbbjn.exe" C:\Windows\SysWOW64\pkchgxa\
        2⤵
          PID:3872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pkchgxa binPath= "C:\Windows\SysWOW64\pkchgxa\ahgtbbjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\446fec896bd9a5d0bffb8939a709229d70698d7b5b05676f624a8b7378ac512f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pkchgxa "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pkchgxa
          2⤵
          • Launches sc.exe
          PID:740
        • 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:4044
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2768 -s 1440
          2⤵
          • Program crash
          PID:4396
      • C:\Windows\SysWOW64\pkchgxa\ahgtbbjn.exe
        C:\Windows\SysWOW64\pkchgxa\ahgtbbjn.exe /d"C:\Users\Admin\AppData\Local\Temp\446fec896bd9a5d0bffb8939a709229d70698d7b5b05676f624a8b7378ac512f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4684
        • 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:4440
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4684 -s 512
          2⤵
          • Program crash
          PID:3980
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2768 -ip 2768
        1⤵
          PID:1748
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 4684 -ip 4684
          1⤵
            PID:2020

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  14.4MB

                  MD5

                  cdf58b4ed28ec6bc95aa5a7124d3c786

                  SHA1

                  a410b05567a96fc943b5f75602e0439d1faa04f2

                  SHA256

                  f6d3e72e6533c6e0061387e5208b67bc6c0c4465e7748a691c94d68cdcfdb028

                  SHA512

                  aeaf14674a69ce04cf2d871290d57bfed3fdff25612ff8d31e48bd64c1a38890608fa435d00c9c408141de5aa62fb1f91000a983fdda72893ccc9fa20206aacb

                • C:\Windows\SysWOW64\pkchgxa\ahgtbbjn.exe

                  Filesize

                  14.4MB

                  MD5

                  cdf58b4ed28ec6bc95aa5a7124d3c786

                  SHA1

                  a410b05567a96fc943b5f75602e0439d1faa04f2

                  SHA256

                  f6d3e72e6533c6e0061387e5208b67bc6c0c4465e7748a691c94d68cdcfdb028

                  SHA512

                  aeaf14674a69ce04cf2d871290d57bfed3fdff25612ff8d31e48bd64c1a38890608fa435d00c9c408141de5aa62fb1f91000a983fdda72893ccc9fa20206aacb

                • memory/2768-1-0x00000000009C0000-0x0000000000AC0000-memory.dmp

                  Filesize

                  1024KB

                • memory/2768-2-0x0000000000930000-0x0000000000943000-memory.dmp

                  Filesize

                  76KB

                • memory/2768-4-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2768-7-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2768-8-0x0000000000930000-0x0000000000943000-memory.dmp

                  Filesize

                  76KB

                • memory/4440-31-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-37-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-12-0x0000000000E00000-0x0000000000E15000-memory.dmp

                  Filesize

                  84KB

                • memory/4440-16-0x0000000000E00000-0x0000000000E15000-memory.dmp

                  Filesize

                  84KB

                • memory/4440-17-0x0000000000E00000-0x0000000000E15000-memory.dmp

                  Filesize

                  84KB

                • memory/4440-56-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

                  Filesize

                  28KB

                • memory/4440-20-0x0000000000E00000-0x0000000000E15000-memory.dmp

                  Filesize

                  84KB

                • memory/4440-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4440-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4440-25-0x00000000021A0000-0x00000000021A6000-memory.dmp

                  Filesize

                  24KB

                • memory/4440-28-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-32-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-34-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-55-0x0000000007A00000-0x0000000007E0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4440-35-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-33-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-36-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-52-0x0000000007A00000-0x0000000007E0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4440-38-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-39-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-40-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-41-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-42-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-43-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-44-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-45-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-47-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-46-0x00000000021B0000-0x00000000021C0000-memory.dmp

                  Filesize

                  64KB

                • memory/4440-48-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                  Filesize

                  20KB

                • memory/4440-51-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                  Filesize

                  20KB

                • memory/4684-11-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB

                • memory/4684-10-0x0000000000960000-0x0000000000A60000-memory.dmp

                  Filesize

                  1024KB

                • memory/4684-18-0x0000000000400000-0x00000000007CA000-memory.dmp

                  Filesize

                  3.8MB