Analysis

  • max time kernel
    150s
  • 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 13:32

General

  • Target

    c9ba75c3c2b17dd64211ae2d9859ced46f797f4f25d867c63c813462a857b524.exe

  • Size

    203KB

  • MD5

    90d047019c018e2188352f9aeee97192

  • SHA1

    e0d7eee14e19ddb119760d4e15e387f285d82076

  • SHA256

    c9ba75c3c2b17dd64211ae2d9859ced46f797f4f25d867c63c813462a857b524

  • SHA512

    4aa2fa4f364a398cb763cbd317ea91dbac17e9e5ed44e5ebe09ba16e62cedb588d98ad807adb84127b00c757bcfef31f229aed5294a71ce682ef494da558b5a7

  • SSDEEP

    3072:DkIfnM3Jq/AmlEkJiAj1K/2sv1p6Ti/ZVqJnctmLoQCCRLQ+cmk:DkIzXlEh5VqKtm8CXcL

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c9ba75c3c2b17dd64211ae2d9859ced46f797f4f25d867c63c813462a857b524.exe
    "C:\Users\Admin\AppData\Local\Temp\c9ba75c3c2b17dd64211ae2d9859ced46f797f4f25d867c63c813462a857b524.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3556
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jyihsvsh\
      2⤵
        PID:4296
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bvvnqaeq.exe" C:\Windows\SysWOW64\jyihsvsh\
        2⤵
          PID:2752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jyihsvsh binPath= "C:\Windows\SysWOW64\jyihsvsh\bvvnqaeq.exe /d\"C:\Users\Admin\AppData\Local\Temp\c9ba75c3c2b17dd64211ae2d9859ced46f797f4f25d867c63c813462a857b524.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jyihsvsh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jyihsvsh
          2⤵
          • Launches sc.exe
          PID:2704
        • 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:1944
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3556 -s 1044
          2⤵
          • Program crash
          PID:4920
      • C:\Windows\SysWOW64\jyihsvsh\bvvnqaeq.exe
        C:\Windows\SysWOW64\jyihsvsh\bvvnqaeq.exe /d"C:\Users\Admin\AppData\Local\Temp\c9ba75c3c2b17dd64211ae2d9859ced46f797f4f25d867c63c813462a857b524.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2068
        • 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:3636
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2068 -s 508
          2⤵
          • Program crash
          PID:4184
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2068 -ip 2068
        1⤵
          PID:5044
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3556 -ip 3556
          1⤵
            PID:4504

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            13.8MB

            MD5

            c70438afbe7d6e8aaf993e0ee62b6e9c

            SHA1

            2a71f31d9db345bc0ff31782fc1bd629cd698d4d

            SHA256

            c1e0a735d2a0d85439684ff79b57c69869a0257ac384b3cce7c24da3a7bcaa82

            SHA512

            7c0030fe80e6b1df7accdeb55060a09ff5401525999c1e3f5897dd8e15ec13cfd12e9ec5bc02f1ac09e36b09235283292c2554d32aab5601bed52b7df7313e8c

          • memory/2068-15-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/2068-8-0x0000000000590000-0x0000000000690000-memory.dmp

            Filesize

            1024KB

          • memory/2068-11-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/2068-9-0x00000000004C0000-0x00000000004D3000-memory.dmp

            Filesize

            76KB

          • memory/3556-2-0x00000000005A0000-0x00000000005B3000-memory.dmp

            Filesize

            76KB

          • memory/3556-3-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/3556-1-0x00000000005F0000-0x00000000006F0000-memory.dmp

            Filesize

            1024KB

          • memory/3556-16-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/3636-46-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-54-0x0000000007300000-0x000000000770B000-memory.dmp

            Filesize

            4.0MB

          • memory/3636-17-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB

          • memory/3636-18-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB

          • memory/3636-20-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/3636-23-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/3636-24-0x00000000009E0000-0x00000000009E6000-memory.dmp

            Filesize

            24KB

          • memory/3636-27-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-47-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

            Filesize

            20KB

          • memory/3636-50-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

            Filesize

            20KB

          • memory/3636-51-0x0000000007300000-0x000000000770B000-memory.dmp

            Filesize

            4.0MB

          • memory/3636-10-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB

          • memory/3636-45-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-44-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-43-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-14-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB

          • memory/3636-55-0x0000000001BE0000-0x0000000001BE7000-memory.dmp

            Filesize

            28KB

          • memory/3636-42-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-41-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-40-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-39-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-38-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-37-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-36-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-35-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-34-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-33-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-32-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-31-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-30-0x0000000001BC0000-0x0000000001BD0000-memory.dmp

            Filesize

            64KB

          • memory/3636-59-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB