Analysis

  • max time kernel
    145s
  • max time network
    147s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    03-09-2024 16:45

General

  • Target

    UUJycuNA6D.exe

  • Size

    423KB

  • MD5

    b2e864c2f8f6e243822a5c133bb41061

  • SHA1

    5571df4cdc5b65cdc315c95ee52344dda7f12b20

  • SHA256

    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2

  • SHA512

    32a6087702abe92daab3e2c194b07006f5b9d3cdf48c692d23775f0d75e2941882920767148564ac7fedc417beadb1ae75734f240d07bec30eb262ae4f534e73

  • SSDEEP

    6144:qc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:q1OZDisvwdaxO0PuG1R4CWs

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
  • 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).

  • 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
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe
    "C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4228
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\crtccdzb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4800
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mpmfwysi.exe" C:\Windows\SysWOW64\crtccdzb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1888
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create crtccdzb binPath= "C:\Windows\SysWOW64\crtccdzb\mpmfwysi.exe /d\"C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2552
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description crtccdzb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1752
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start crtccdzb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:72
    • 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
      • System Location Discovery: System Language Discovery
      PID:1396
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4228 -s 1096
      2⤵
      • Program crash
      PID:2952
  • C:\Windows\SysWOW64\crtccdzb\mpmfwysi.exe
    C:\Windows\SysWOW64\crtccdzb\mpmfwysi.exe /d"C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:932
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3776
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 932 -s 576
      2⤵
      • Program crash
      PID:1248
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4228 -ip 4228
    1⤵
      PID:4860
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 932 -ip 932
      1⤵
        PID:1484

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        11.1MB

        MD5

        b0bad557872e328489366b11673d2cbc

        SHA1

        b0b931004fb3108d10a0249ebbfa6c8a88e8f292

        SHA256

        87e3b01668f7f0c1683ca2a4dc8bc57f5282dc4940b655c5e2c645506be746cd

        SHA512

        7df9dff086c64a61f0dfb3e40ee22fc1fbf3a8f1c4869aad448ed752af18030813d9902bf3cfadb5bed09e22a789714efaab29965b61b1efd1909626c64df34c

      • memory/932-10-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/932-8-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/932-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3776-38-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-44-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-46-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3776-24-0x00000000013F0000-0x00000000013F6000-memory.dmp

        Filesize

        24KB

      • memory/3776-30-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-31-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-17-0x0000000000D40000-0x0000000000D55000-memory.dmp

        Filesize

        84KB

      • memory/3776-18-0x0000000000D40000-0x0000000000D55000-memory.dmp

        Filesize

        84KB

      • memory/3776-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3776-27-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-55-0x00000000023E0000-0x00000000023E7000-memory.dmp

        Filesize

        28KB

      • memory/3776-54-0x0000000007C00000-0x000000000800B000-memory.dmp

        Filesize

        4.0MB

      • memory/3776-51-0x0000000007C00000-0x000000000800B000-memory.dmp

        Filesize

        4.0MB

      • memory/3776-50-0x00000000023D0000-0x00000000023D5000-memory.dmp

        Filesize

        20KB

      • memory/3776-47-0x00000000023D0000-0x00000000023D5000-memory.dmp

        Filesize

        20KB

      • memory/3776-45-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-9-0x0000000000D40000-0x0000000000D55000-memory.dmp

        Filesize

        84KB

      • memory/3776-43-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-42-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-41-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-40-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-39-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-32-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-37-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-36-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-35-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-34-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/3776-33-0x00000000023C0000-0x00000000023D0000-memory.dmp

        Filesize

        64KB

      • memory/4228-1-0x00000000007E0000-0x00000000008E0000-memory.dmp

        Filesize

        1024KB

      • memory/4228-2-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/4228-14-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/4228-15-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4228-13-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4228-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB