Analysis

  • max time kernel
    149s
  • max time network
    152s
  • 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 14:50

General

  • Target

    3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe

  • Size

    203KB

  • MD5

    e80ed6ccb333b7fc33ffc98bca43b57d

  • SHA1

    170281a608fe94eee06a9f45466f6a47bd2272e3

  • SHA256

    3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3

  • SHA512

    3209c004cebb1e2f544f7d8457175a62da8a225bc08bcbb051c240eddc610ca8e1ddfe7f6d758d2e09517030afad689b6805fc2b8b801a1f182c04369191a30d

  • SSDEEP

    3072:eafjdfYraZJXENc8uCXJiXK1K2LEpzUCV+PaIh9bwdANblLNBNKRrxbU+cmH:eafjqQ15OCyLLkCVkxbDco

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
  • 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\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe
    "C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1204
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ffyznpke\
      2⤵
        PID:5108
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gvnuzxcu.exe" C:\Windows\SysWOW64\ffyznpke\
        2⤵
          PID:3160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ffyznpke binPath= "C:\Windows\SysWOW64\ffyznpke\gvnuzxcu.exe /d\"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ffyznpke "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ffyznpke
          2⤵
          • Launches sc.exe
          PID:4924
        • 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:4332
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1204 -s 1240
          2⤵
          • Program crash
          PID:4888
      • C:\Windows\SysWOW64\ffyznpke\gvnuzxcu.exe
        C:\Windows\SysWOW64\ffyznpke\gvnuzxcu.exe /d"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1536
        • 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:3008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1536 -s 544
          2⤵
          • Program crash
          PID:4600
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1536 -ip 1536
        1⤵
          PID:4072
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 1204 -ip 1204
          1⤵
            PID:3120

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.9MB

            MD5

            c6c08135f36ae9470ea47b9a106cd342

            SHA1

            56e74974d6b6d9573bb77588d4a9937f80f716cd

            SHA256

            ba7339b355ede3df2445d687e228e2e400cb324d23c80e71448930e2bee708d4

            SHA512

            85795a12956812fd301f318013b6a67d6e98fb39ba2b4ab920c9a148560147d521fe31560c2107533a05f42aac15cb38d9df9637cf296acb10a9a45ad44fea7a

          • memory/1204-16-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/1204-2-0x00000000005E0000-0x00000000005F3000-memory.dmp

            Filesize

            76KB

          • memory/1204-3-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/1204-1-0x0000000000620000-0x0000000000720000-memory.dmp

            Filesize

            1024KB

          • memory/1536-8-0x00000000004A0000-0x00000000005A0000-memory.dmp

            Filesize

            1024KB

          • memory/1536-12-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/1536-10-0x0000000000D10000-0x0000000000D23000-memory.dmp

            Filesize

            76KB

          • memory/3008-37-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-51-0x0000000007540000-0x000000000794B000-memory.dmp

            Filesize

            4.0MB

          • memory/3008-17-0x0000000000110000-0x0000000000125000-memory.dmp

            Filesize

            84KB

          • memory/3008-18-0x0000000000110000-0x0000000000125000-memory.dmp

            Filesize

            84KB

          • memory/3008-20-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/3008-23-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/3008-24-0x00000000007F0000-0x00000000007F6000-memory.dmp

            Filesize

            24KB

          • memory/3008-27-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-35-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-38-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-9-0x0000000000110000-0x0000000000125000-memory.dmp

            Filesize

            84KB

          • memory/3008-46-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-44-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-43-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-50-0x0000000002720000-0x0000000002725000-memory.dmp

            Filesize

            20KB

          • memory/3008-14-0x0000000000110000-0x0000000000125000-memory.dmp

            Filesize

            84KB

          • memory/3008-47-0x0000000002720000-0x0000000002725000-memory.dmp

            Filesize

            20KB

          • memory/3008-42-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-41-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-40-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-54-0x0000000007540000-0x000000000794B000-memory.dmp

            Filesize

            4.0MB

          • memory/3008-39-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-36-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-45-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-34-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-33-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-32-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-31-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-30-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/3008-55-0x00000000029F0000-0x00000000029F7000-memory.dmp

            Filesize

            28KB

          • memory/3008-59-0x0000000000110000-0x0000000000125000-memory.dmp

            Filesize

            84KB