Analysis

  • max time kernel
    45s
  • max time network
    48s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 07:21

General

  • Target

    vbojcjwr.exe

  • Size

    14.6MB

  • MD5

    0b6833eac88372fe36ddb7217eca8b41

  • SHA1

    240c3b81c19be5b09d140bbd9a35060f4a7a7573

  • SHA256

    4a5face1152fe18fd167e2f785857e0e4266997ff8d74285fa920bcb83523ca8

  • SHA512

    2d60e25ba50d496b3f359deb713e2c206edbffb6bd2233729ad0bba87cb247ba5bb6a3c0f6d3a6f5bcde3b58e3c58259490c62bff14769efff6f77280069519b

  • SSDEEP

    6144:qw0VDy74AW/47pwSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSn:qw0VD7AW/49

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 1 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 2 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\vbojcjwr.exe
    "C:\Users\Admin\AppData\Local\Temp\vbojcjwr.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4004
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kvfihnwa\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1840
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\syqfkdu.exe" C:\Windows\SysWOW64\kvfihnwa\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4112
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kvfihnwa binPath= "C:\Windows\SysWOW64\kvfihnwa\syqfkdu.exe /d\"C:\Users\Admin\AppData\Local\Temp\vbojcjwr.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4304
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kvfihnwa "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:736
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kvfihnwa
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2820
    • 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:2568
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4004 -s 1308
      2⤵
      • Program crash
      PID:1428
  • C:\Windows\SysWOW64\kvfihnwa\syqfkdu.exe
    C:\Windows\SysWOW64\kvfihnwa\syqfkdu.exe /d"C:\Users\Admin\AppData\Local\Temp\vbojcjwr.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4880
    • 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:4440
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4880 -s 516
      2⤵
      • Program crash
      PID:680
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4004 -ip 4004
    1⤵
      PID:1760
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4880 -ip 4880
      1⤵
        PID:4700

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.1MB

        MD5

        94711e204022fa34c4c57ae8079682c0

        SHA1

        fe18f18b725ec9fb4f8e7cd747cfe5e2f2343ae1

        SHA256

        693e327601fe6c76e8ded1021f09f651ac96eeb9d966f477da8f25a995cf4fbe

        SHA512

        5e133a021fe6e6c40f6e1c9e05fc3d350ede0525f51f61c2efbe6d89a8423a903c647399fad988cca8e281c2d3b54d77ba53d5378ccb374dcd41b8f391891f4a

      • memory/4004-15-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4004-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4004-2-0x00000000021A0000-0x00000000021B3000-memory.dmp

        Filesize

        76KB

      • memory/4004-14-0x00000000021A0000-0x00000000021B3000-memory.dmp

        Filesize

        76KB

      • memory/4004-1-0x00000000005F0000-0x00000000006F0000-memory.dmp

        Filesize

        1024KB

      • memory/4004-13-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/4440-11-0x0000000000B70000-0x0000000000B85000-memory.dmp

        Filesize

        84KB

      • memory/4440-18-0x0000000000B70000-0x0000000000B85000-memory.dmp

        Filesize

        84KB

      • memory/4440-19-0x0000000000B70000-0x0000000000B85000-memory.dmp

        Filesize

        84KB

      • memory/4880-9-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/4880-8-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/4880-10-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/4880-17-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB