Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-11-2023 03:18

General

  • Target

    f8c2e197d36f46b8189a0e58d3afeabe154d523f406ac760a2b1797ca6ba1199.exe

  • Size

    253KB

  • MD5

    cc2a72f82d92baff8f3f98da48101ab4

  • SHA1

    e2377c18ce0858f84b50ac9317de81f15c196b8c

  • SHA256

    f8c2e197d36f46b8189a0e58d3afeabe154d523f406ac760a2b1797ca6ba1199

  • SHA512

    369ae41f47dbb81fd7a0afb2504aadf2713b887a6c424c63a5cb7b7ceda28cae1eef4fa1c005fa33cde8ec0c93d51f8cfb25aaa0ec0039cc2277b9160e491e7f

  • SSDEEP

    3072:HFRhzXDDoLnJJDCEtGKL+5mDyHZMctBDnuUY7yHjP4q5XWtlV1f:lRhzXPoLnvDPtGE6gyHdtfYmHj3WpV

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\f8c2e197d36f46b8189a0e58d3afeabe154d523f406ac760a2b1797ca6ba1199.exe
    "C:\Users\Admin\AppData\Local\Temp\f8c2e197d36f46b8189a0e58d3afeabe154d523f406ac760a2b1797ca6ba1199.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2984
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\isevpcdv\
      2⤵
        PID:3176
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fmlyggos.exe" C:\Windows\SysWOW64\isevpcdv\
        2⤵
          PID:5064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create isevpcdv binPath= "C:\Windows\SysWOW64\isevpcdv\fmlyggos.exe /d\"C:\Users\Admin\AppData\Local\Temp\f8c2e197d36f46b8189a0e58d3afeabe154d523f406ac760a2b1797ca6ba1199.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4240
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description isevpcdv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:636
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start isevpcdv
          2⤵
          • Launches sc.exe
          PID:2940
        • 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:4396
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2984 -s 1192
          2⤵
          • Program crash
          PID:1632
      • C:\Windows\SysWOW64\isevpcdv\fmlyggos.exe
        C:\Windows\SysWOW64\isevpcdv\fmlyggos.exe /d"C:\Users\Admin\AppData\Local\Temp\f8c2e197d36f46b8189a0e58d3afeabe154d523f406ac760a2b1797ca6ba1199.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4572
        • 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:4212
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4572 -s 524
          2⤵
          • Program crash
          PID:2492
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2984 -ip 2984
        1⤵
          PID:1940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 4572 -ip 4572
          1⤵
            PID:1696

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.2MB

            MD5

            5cbd9377aca32155425367cd3f669f84

            SHA1

            a99d65e2d08f4b3fc7951c9598e6c3e4f1ac14e1

            SHA256

            06f2114b15bcc3d79466a2f15239384691715ba5c660cb453c3c8e3516ad5792

            SHA512

            4ecdf36e3682b140110e5411ad77772da7c91cf5380d9a30bbd5df2ff29509b13a1ebae95e07861e6d43851446c269384d94dee9b64762587c4370998c61ad9d

          • C:\Windows\SysWOW64\isevpcdv\fmlyggos.exe

            Filesize

            10.2MB

            MD5

            5cbd9377aca32155425367cd3f669f84

            SHA1

            a99d65e2d08f4b3fc7951c9598e6c3e4f1ac14e1

            SHA256

            06f2114b15bcc3d79466a2f15239384691715ba5c660cb453c3c8e3516ad5792

            SHA512

            4ecdf36e3682b140110e5411ad77772da7c91cf5380d9a30bbd5df2ff29509b13a1ebae95e07861e6d43851446c269384d94dee9b64762587c4370998c61ad9d

          • memory/2984-15-0x0000000000400000-0x00000000004F3000-memory.dmp

            Filesize

            972KB

          • memory/2984-2-0x0000000002240000-0x0000000002253000-memory.dmp

            Filesize

            76KB

          • memory/2984-3-0x0000000000400000-0x00000000004F3000-memory.dmp

            Filesize

            972KB

          • memory/2984-1-0x0000000000870000-0x0000000000970000-memory.dmp

            Filesize

            1024KB

          • memory/4212-33-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-35-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-11-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

            Filesize

            84KB

          • memory/4212-14-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

            Filesize

            84KB

          • memory/4212-56-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

            Filesize

            28KB

          • memory/4212-55-0x0000000007700000-0x0000000007B0B000-memory.dmp

            Filesize

            4.0MB

          • memory/4212-17-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

            Filesize

            84KB

          • memory/4212-18-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

            Filesize

            84KB

          • memory/4212-20-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

            Filesize

            84KB

          • memory/4212-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/4212-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/4212-25-0x0000000001FA0000-0x0000000001FA6000-memory.dmp

            Filesize

            24KB

          • memory/4212-28-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-32-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-52-0x0000000007700000-0x0000000007B0B000-memory.dmp

            Filesize

            4.0MB

          • memory/4212-34-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-31-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-51-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

            Filesize

            20KB

          • memory/4212-36-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-37-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-40-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-41-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-44-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-43-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-42-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-39-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-38-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-45-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-46-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-47-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

            Filesize

            64KB

          • memory/4212-48-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

            Filesize

            20KB

          • memory/4572-10-0x0000000000400000-0x00000000004F3000-memory.dmp

            Filesize

            972KB

          • memory/4572-9-0x0000000000DC0000-0x0000000000DD3000-memory.dmp

            Filesize

            76KB

          • memory/4572-16-0x0000000000400000-0x00000000004F3000-memory.dmp

            Filesize

            972KB

          • memory/4572-8-0x0000000000720000-0x0000000000820000-memory.dmp

            Filesize

            1024KB