Analysis

  • max time kernel
    119s
  • max time network
    119s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-10-2024 02:31

General

  • Target

    c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe

  • Size

    291KB

  • MD5

    2142c9af71f9457bde9b686bb5026b40

  • SHA1

    945388f0679942e5d7e09002c196e7f6221bc138

  • SHA256

    c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69d

  • SHA512

    5518e3a0c4ecc3be651daf6c2e90e7d00820a5eabc1ed5659cbd3ef6037df2a56c8c098d319f4ba5cc803f197731023b731a26758271f4a3f746083102b166ba

  • SSDEEP

    6144:TBkkWqRq2Xlt7GqD7hetXXPgPmU7J0jw:SV2XlEc7h+P8mU7J3

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.

  • Tofsee family
  • 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
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe
    "C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2108
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lgjtevfh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3952
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\trbceadj.exe" C:\Windows\SysWOW64\lgjtevfh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1548
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create lgjtevfh binPath= "C:\Windows\SysWOW64\lgjtevfh\trbceadj.exe /d\"C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2228
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description lgjtevfh "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4364
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start lgjtevfh
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:540
    • 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:3860
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2108 -s 580
      2⤵
      • Program crash
      PID:2616
  • C:\Windows\SysWOW64\lgjtevfh\trbceadj.exe
    C:\Windows\SysWOW64\lgjtevfh\trbceadj.exe /d"C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1040
    • 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:1788
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1040 -s 532
      2⤵
      • Program crash
      PID:4848
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 2108 -ip 2108
    1⤵
      PID:2700
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1040 -ip 1040
      1⤵
        PID:1872

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.7MB

        MD5

        9d8a78fd37215b25df553c71ae4d766c

        SHA1

        0a3df38fcf46a1d36156bad0954fa24cd66b3f6d

        SHA256

        dd270a55425b88c9d017c081d77de31e1056106fe1a3c1f5a8618ed64eadb266

        SHA512

        f443dd4480193025934dfcdb537f2fcbbd60c6890e659a4f2de903ce4e5cb5161c375ac480e444725e4fe17788d4ff0aaa5b4477a38211aca7cb0594cae793db

      • memory/1040-15-0x0000000000400000-0x0000000002462000-memory.dmp

        Filesize

        32.4MB

      • memory/1788-41-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-31-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-21-0x00000000019A0000-0x00000000019A6000-memory.dmp

        Filesize

        24KB

      • memory/1788-40-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-18-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1788-39-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-13-0x0000000000600000-0x0000000000615000-memory.dmp

        Filesize

        84KB

      • memory/1788-14-0x0000000000600000-0x0000000000615000-memory.dmp

        Filesize

        84KB

      • memory/1788-51-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/1788-37-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-52-0x00000000027E0000-0x00000000027E7000-memory.dmp

        Filesize

        28KB

      • memory/1788-48-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/1788-47-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/1788-44-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/1788-43-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-42-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-24-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1788-11-0x0000000000600000-0x0000000000615000-memory.dmp

        Filesize

        84KB

      • memory/1788-38-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-36-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-35-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-33-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-34-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-32-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-27-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-30-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-29-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1788-28-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/2108-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2108-8-0x00000000041C0000-0x00000000041D3000-memory.dmp

        Filesize

        76KB

      • memory/2108-2-0x00000000041C0000-0x00000000041D3000-memory.dmp

        Filesize

        76KB

      • memory/2108-7-0x0000000000400000-0x0000000002462000-memory.dmp

        Filesize

        32.4MB

      • memory/2108-1-0x0000000002620000-0x0000000002720000-memory.dmp

        Filesize

        1024KB

      • memory/2108-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB