Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-10-2024 14:24

General

  • Target

    R4UBC5O.exe

  • Size

    208KB

  • MD5

    40f7ef5677b0ab00743c0a66b2d9c96a

  • SHA1

    a3b64e7d2731a21d9b574ab3f3a804474d5ce3ff

  • SHA256

    eb841ffe2d0c66d018d4d53b6a787a61c405c28def7bed3274814dddf793ae4a

  • SHA512

    9d8fd1de044f8bb399d6b6003abb573ecf00bfc270fa4d2c19f1d97d3dbc040557acf838e4673d5b859817aa9e76d008a5ac999320ee2b0ded409fe7de624689

  • SSDEEP

    3072:wZ4mW1Q1X5y/62wLAebhfcZsPj9w1RBeg8+/yGNV:i4ZA5862w79kZYkRBeA

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
  • 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\R4UBC5O.exe
    "C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4176
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\efzhfdrd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4556
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wdcpxxfj.exe" C:\Windows\SysWOW64\efzhfdrd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1876
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create efzhfdrd binPath= "C:\Windows\SysWOW64\efzhfdrd\wdcpxxfj.exe /d\"C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1556
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description efzhfdrd "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1676
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start efzhfdrd
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3028
    • 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:1008
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4176 -s 1044
      2⤵
      • Program crash
      PID:4704
  • C:\Windows\SysWOW64\efzhfdrd\wdcpxxfj.exe
    C:\Windows\SysWOW64\efzhfdrd\wdcpxxfj.exe /d"C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4916
    • 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:1600
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4916 -s 516
      2⤵
      • Program crash
      PID:2444
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4176 -ip 4176
    1⤵
      PID:2520
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 4916 -ip 4916
      1⤵
        PID:3544

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.6MB

        MD5

        e1aac92d883de2ed98d3be98a86b2f2d

        SHA1

        3c0a6ba7823d72809aefcb2a8cba22a8e629215a

        SHA256

        8c4f7b6ce078c11a8986f6e9f43fdd1098e9bb973ddbbd2e64f523670b89843e

        SHA512

        ec1217eb17d85ea29b8de6518104df3ef0509d3452ca7f1e90ba402b34ad8c031bf7ab8b92d215c93538c85a0ac8a7dc98cf498a77dc33ed1ef275c430660d88

      • memory/1600-46-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-32-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-55-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/1600-47-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-28-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-24-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1600-31-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-33-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-34-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-14-0x0000000000610000-0x0000000000625000-memory.dmp

        Filesize

        84KB

      • memory/1600-16-0x0000000000610000-0x0000000000625000-memory.dmp

        Filesize

        84KB

      • memory/1600-17-0x0000000000610000-0x0000000000625000-memory.dmp

        Filesize

        84KB

      • memory/1600-35-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-45-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-56-0x00000000027D0000-0x00000000027D7000-memory.dmp

        Filesize

        28KB

      • memory/1600-52-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/1600-51-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/1600-48-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/1600-25-0x0000000000DF0000-0x0000000000DF6000-memory.dmp

        Filesize

        24KB

      • memory/1600-36-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-22-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1600-44-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-43-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-42-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-41-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-40-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-39-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-38-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/1600-37-0x00000000019E0000-0x00000000019F0000-memory.dmp

        Filesize

        64KB

      • memory/4176-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4176-1-0x0000000000550000-0x0000000000650000-memory.dmp

        Filesize

        1024KB

      • memory/4176-8-0x00000000021C0000-0x00000000021D3000-memory.dmp

        Filesize

        76KB

      • memory/4176-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4176-7-0x0000000000400000-0x0000000000473000-memory.dmp

        Filesize

        460KB

      • memory/4176-2-0x00000000021C0000-0x00000000021D3000-memory.dmp

        Filesize

        76KB

      • memory/4916-19-0x0000000000400000-0x0000000000473000-memory.dmp

        Filesize

        460KB

      • memory/4916-13-0x0000000000400000-0x0000000000473000-memory.dmp

        Filesize

        460KB

      • memory/4916-11-0x0000000000400000-0x0000000000473000-memory.dmp

        Filesize

        460KB

      • memory/4916-12-0x0000000000400000-0x0000000000473000-memory.dmp

        Filesize

        460KB