Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-07-2024 16:20

General

  • Target

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe

  • Size

    164KB

  • MD5

    c20fa0ab6b79f5d972c8ce22fa9c52b1

  • SHA1

    a4684e4d865d543a2a498f034af4c9d2c1b6261a

  • SHA256

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a

  • SHA512

    3ace193785b00978e06d8dc5a7db3872a7e719c2c8b2b2da07ffcdbe3f9a1188962f974b9d2fb1ed4c0e0f93cf33b575ca5d2b27019dab301bb1e21a181e5a94

  • SSDEEP

    3072:++/LImiO24Vvt0JiGcFaw/5uCvZMt/2PE9w:3/LIP63GcRasP

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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe
    "C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2160
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\waavwkzo\
      2⤵
        PID:368
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rhdsnfdl.exe" C:\Windows\SysWOW64\waavwkzo\
        2⤵
          PID:3380
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create waavwkzo binPath= "C:\Windows\SysWOW64\waavwkzo\rhdsnfdl.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4052
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description waavwkzo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4440
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start waavwkzo
          2⤵
          • Launches sc.exe
          PID:4136
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:2316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2160 -s 588
          2⤵
          • Program crash
          PID:4300
      • C:\Windows\SysWOW64\waavwkzo\rhdsnfdl.exe
        C:\Windows\SysWOW64\waavwkzo\rhdsnfdl.exe /d"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3968
        • 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:544
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3968 -s 272
          2⤵
          • Program crash
          PID:4616
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2160 -ip 2160
        1⤵
          PID:3880
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3968 -ip 3968
          1⤵
            PID:2916

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            13.2MB

            MD5

            6d1d255918a6c8a095b5821dd0f3b2eb

            SHA1

            018beed3d8b8aa42354eff99f2320c8cfae07408

            SHA256

            2e215cac72cffc5522645fac61a734b8b1be0d5c98163775b7326ce437d85232

            SHA512

            25c2e88b052fd3e8a0cdd7c44a0277f8cf29b52003a5f6aa3d48d234a5994901feec1fe9c1dabbfb39ad24e4d046157a14ca7404c39e06e2124d1c9ab0bba0db

          • memory/544-46-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/544-22-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/544-23-0x0000000002360000-0x0000000002366000-memory.dmp
            Filesize

            24KB

          • memory/544-44-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-26-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-29-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-30-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-31-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-45-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-15-0x0000000000CA0000-0x0000000000CB5000-memory.dmp
            Filesize

            84KB

          • memory/544-16-0x0000000000CA0000-0x0000000000CB5000-memory.dmp
            Filesize

            84KB

          • memory/544-32-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/544-54-0x0000000002FE0000-0x0000000002FE7000-memory.dmp
            Filesize

            28KB

          • memory/544-53-0x0000000007A80000-0x0000000007E8B000-memory.dmp
            Filesize

            4.0MB

          • memory/544-50-0x0000000007A80000-0x0000000007E8B000-memory.dmp
            Filesize

            4.0MB

          • memory/544-49-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/544-33-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-13-0x0000000000CA0000-0x0000000000CB5000-memory.dmp
            Filesize

            84KB

          • memory/544-34-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-38-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-42-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-41-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-40-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-39-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-43-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-37-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-36-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/544-35-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/2160-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2160-1-0x00000000006B0000-0x00000000007B0000-memory.dmp
            Filesize

            1024KB

          • memory/2160-8-0x0000000000630000-0x0000000000643000-memory.dmp
            Filesize

            76KB

          • memory/2160-9-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2160-7-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/2160-2-0x0000000000630000-0x0000000000643000-memory.dmp
            Filesize

            76KB

          • memory/3968-17-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/3968-11-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/3968-12-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB