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Analysis

  • max time kernel
    148s
  • max time network
    160s
  • 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, 18:59

General

  • Target

    file.exe

  • Size

    225KB

  • MD5

    6546844f130e761aeb34029466409553

  • SHA1

    0aeb09a39e97d2526fe8ff8467129c8b48506fef

  • SHA256

    8d5bd2b247ca7d188c082e08e7a90034110482919e7b737b838c6dade6b4d644

  • SHA512

    1223795b2ec6a6410f943a21d4f8c03dc31792f3ea19407ed2cdbefa24b5373a2f9dd5b4103c71c065b19d7243733fab1390f6972eb15e2a32f56a98146b546e

  • SSDEEP

    3072:3X5VL2484h6kCiEjjPv1S9Q7QikIPXV9tEnYufioL26FzYxL5yMzuTy:n/Nh67iEjjkQMWbufs0eUMyT

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
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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:3788
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\flxzorpx\
      2⤵
        PID:4284
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jzvkfxvd.exe" C:\Windows\SysWOW64\flxzorpx\
        2⤵
          PID:3580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create flxzorpx binPath= "C:\Windows\SysWOW64\flxzorpx\jzvkfxvd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3848
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description flxzorpx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:428
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start flxzorpx
          2⤵
          • Launches sc.exe
          PID:4492
        • 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:4712
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3788 -s 1180
          2⤵
          • Program crash
          PID:4116
      • C:\Windows\SysWOW64\flxzorpx\jzvkfxvd.exe
        C:\Windows\SysWOW64\flxzorpx\jzvkfxvd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2092
        • 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:5060
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2092 -s 192
          2⤵
          • Program crash
          PID:4924
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3788 -ip 3788
        1⤵
          PID:1084
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2092 -ip 2092
          1⤵
            PID:2012

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.9MB

            MD5

            e9b8b19257664d1d99a2f8030e4bc16f

            SHA1

            2f386b42e157ff6f3413db57054a37702152b6a3

            SHA256

            e3861f71920e8c02db86b7cf34d22ab9939912f1e46d32b261c00ff5e847bbea

            SHA512

            565225a8e5d90654ef2c29dc1072e5470ef11d2c487cf6798fc57704e85b9b7b30d43e7b35bf44970fae0bc1d52209e4685ef007c4284e1b277e6f8ac795ab71

          • C:\Windows\SysWOW64\flxzorpx\jzvkfxvd.exe

            Filesize

            10.9MB

            MD5

            e9b8b19257664d1d99a2f8030e4bc16f

            SHA1

            2f386b42e157ff6f3413db57054a37702152b6a3

            SHA256

            e3861f71920e8c02db86b7cf34d22ab9939912f1e46d32b261c00ff5e847bbea

            SHA512

            565225a8e5d90654ef2c29dc1072e5470ef11d2c487cf6798fc57704e85b9b7b30d43e7b35bf44970fae0bc1d52209e4685ef007c4284e1b277e6f8ac795ab71

          • memory/2092-18-0x0000000000400000-0x00000000005B0000-memory.dmp

            Filesize

            1.7MB

          • memory/2092-11-0x0000000000890000-0x0000000000990000-memory.dmp

            Filesize

            1024KB

          • memory/2092-12-0x0000000000400000-0x00000000005B0000-memory.dmp

            Filesize

            1.7MB

          • memory/3788-2-0x00000000021B0000-0x00000000021C3000-memory.dmp

            Filesize

            76KB

          • memory/3788-3-0x0000000000400000-0x00000000005B0000-memory.dmp

            Filesize

            1.7MB

          • memory/3788-8-0x0000000000400000-0x00000000005B0000-memory.dmp

            Filesize

            1.7MB

          • memory/3788-10-0x00000000021B0000-0x00000000021C3000-memory.dmp

            Filesize

            76KB

          • memory/3788-1-0x0000000000600000-0x0000000000700000-memory.dmp

            Filesize

            1024KB

          • memory/5060-33-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-39-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-16-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

            Filesize

            84KB

          • memory/5060-20-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

            Filesize

            84KB

          • memory/5060-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/5060-24-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/5060-25-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

            Filesize

            24KB

          • memory/5060-28-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-31-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-32-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-13-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

            Filesize

            84KB

          • memory/5060-34-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-35-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-36-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-37-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-17-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

            Filesize

            84KB

          • memory/5060-38-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-41-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-42-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-40-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-43-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-45-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-44-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-47-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-46-0x0000000002380000-0x0000000002390000-memory.dmp

            Filesize

            64KB

          • memory/5060-48-0x00000000023D0000-0x00000000023D5000-memory.dmp

            Filesize

            20KB

          • memory/5060-51-0x00000000023D0000-0x00000000023D5000-memory.dmp

            Filesize

            20KB

          • memory/5060-52-0x0000000007C00000-0x000000000800B000-memory.dmp

            Filesize

            4.0MB

          • memory/5060-55-0x0000000007C00000-0x000000000800B000-memory.dmp

            Filesize

            4.0MB

          • memory/5060-56-0x00000000023E0000-0x00000000023E7000-memory.dmp

            Filesize

            28KB