Analysis

  • max time kernel
    146s
  • max time network
    150s
  • 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 14:49

General

  • Target

    04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe

  • Size

    233KB

  • MD5

    f81a2c93c44bfec11cdd55eb53dde5df

  • SHA1

    45cb3d7066113e86fff081e309265a797af0ef51

  • SHA256

    04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482

  • SHA512

    c9fc2a6239235aa0bf24e700665666c8500000bcc76dc8e26922f8cfc0f961949bf7fa04bf9877ea3254b9a5879752d1b3f75d945318c246770b507bc0b0199e

  • SSDEEP

    3072:LefNGJ/ceeYkb2BNog9oADOF4t0wC0NnpXIpKjVEqLDOO7n+MnIitmjXO9ZJwVQk:Le1GM+NobFm0wC0NpYpuVEqSFOTF

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe
    "C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1244
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rjpbahhl\
      2⤵
        PID:1912
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mykpmsrf.exe" C:\Windows\SysWOW64\rjpbahhl\
        2⤵
          PID:4060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rjpbahhl binPath= "C:\Windows\SysWOW64\rjpbahhl\mykpmsrf.exe /d\"C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:456
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rjpbahhl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2500
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rjpbahhl
          2⤵
          • Launches sc.exe
          PID:3696
        • 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:4504
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1244 -s 892
          2⤵
          • Program crash
          PID:536
      • C:\Windows\SysWOW64\rjpbahhl\mykpmsrf.exe
        C:\Windows\SysWOW64\rjpbahhl\mykpmsrf.exe /d"C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:868
        • 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:1396
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 868 -s 512
          2⤵
          • Program crash
          PID:4812
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 868 -ip 868
        1⤵
          PID:1300
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 1244 -ip 1244
          1⤵
            PID:3516

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            12.4MB

            MD5

            e08ecf9f4bcd02d0c8103fa6176549bf

            SHA1

            2442ea9d325e62dfadeaad2c6d96df2d2ade0c23

            SHA256

            33074d59f7fba14a652a431493a2785980221238fa6c28d1c74fc5ccaa5c1981

            SHA512

            c80024d1e5981765a181b6a5c3ecd3de99f920d503fcd53ef87590ccd2a2784d559902377b32255ad436a35ea39f63fac03a70d5d01387a40f33604f8a99679f

          • memory/868-8-0x00000000005C0000-0x00000000006C0000-memory.dmp
            Filesize

            1024KB

          • memory/868-11-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/868-10-0x00000000005A0000-0x00000000005B3000-memory.dmp
            Filesize

            76KB

          • memory/1244-16-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/1244-2-0x0000000002190000-0x00000000021A3000-memory.dmp
            Filesize

            76KB

          • memory/1244-4-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/1244-1-0x0000000000460000-0x0000000000560000-memory.dmp
            Filesize

            1024KB

          • memory/1396-33-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-36-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-17-0x00000000012D0000-0x00000000012E5000-memory.dmp
            Filesize

            84KB

          • memory/1396-18-0x00000000012D0000-0x00000000012E5000-memory.dmp
            Filesize

            84KB

          • memory/1396-20-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/1396-23-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/1396-24-0x0000000002780000-0x0000000002786000-memory.dmp
            Filesize

            24KB

          • memory/1396-27-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-32-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-34-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-9-0x00000000012D0000-0x00000000012E5000-memory.dmp
            Filesize

            84KB

          • memory/1396-35-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-31-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-30-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-37-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-14-0x00000000012D0000-0x00000000012E5000-memory.dmp
            Filesize

            84KB

          • memory/1396-39-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-41-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-47-0x00000000027E0000-0x00000000027E5000-memory.dmp
            Filesize

            20KB

          • memory/1396-46-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-45-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-51-0x0000000007F00000-0x000000000830B000-memory.dmp
            Filesize

            4.0MB

          • memory/1396-50-0x00000000027E0000-0x00000000027E5000-memory.dmp
            Filesize

            20KB

          • memory/1396-44-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-43-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-42-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-40-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-38-0x0000000002790000-0x00000000027A0000-memory.dmp
            Filesize

            64KB

          • memory/1396-54-0x0000000007F00000-0x000000000830B000-memory.dmp
            Filesize

            4.0MB

          • memory/1396-55-0x00000000027F0000-0x00000000027F7000-memory.dmp
            Filesize

            28KB

          • memory/1396-59-0x00000000012D0000-0x00000000012E5000-memory.dmp
            Filesize

            84KB