Analysis

  • max time kernel
    149s
  • max time network
    157s
  • 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 16:29

General

  • Target

    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe
    "C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3000
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\deyjmbzt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4792
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vcbowwei.exe" C:\Windows\SysWOW64\deyjmbzt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:788
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create deyjmbzt binPath= "C:\Windows\SysWOW64\deyjmbzt\vcbowwei.exe /d\"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2652
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description deyjmbzt "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3880
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start deyjmbzt
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4144
    • 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:572
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3000 -s 1100
      2⤵
      • Program crash
      PID:3440
  • C:\Windows\SysWOW64\deyjmbzt\vcbowwei.exe
    C:\Windows\SysWOW64\deyjmbzt\vcbowwei.exe /d"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3548
    • 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:3108
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3548 -s 576
      2⤵
      • Program crash
      PID:928
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3000 -ip 3000
    1⤵
      PID:4136
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 3548 -ip 3548
      1⤵
        PID:1544

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.9MB

        MD5

        01bb7db6fb951a7547b7c51003b8d59c

        SHA1

        f9dadcf65fac2c9dab054cdc214147830b5a8bfa

        SHA256

        c9a70c1251bbcc19485c6a15a66ab2179eefdb320b22143aa438ef31c9a14b48

        SHA512

        a828936ecb9c3cdb39b6508306f84a16a14a16be15460e7dbe66170bd73ab6353a5022c9a150a71cae92f0fc99cb653c70bc057fba91ed95210073eaa246a900

      • memory/3000-1-0x00000000007E0000-0x00000000008E0000-memory.dmp

        Filesize

        1024KB

      • memory/3000-2-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/3000-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3000-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3000-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3000-8-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/3108-45-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-41-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-15-0x0000000000920000-0x0000000000935000-memory.dmp

        Filesize

        84KB

      • memory/3108-13-0x0000000000920000-0x0000000000935000-memory.dmp

        Filesize

        84KB

      • memory/3108-16-0x0000000000920000-0x0000000000935000-memory.dmp

        Filesize

        84KB

      • memory/3108-53-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3108-36-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-49-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/3108-50-0x0000000007800000-0x0000000007C0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3108-54-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

        Filesize

        28KB

      • memory/3108-46-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

        Filesize

        20KB

      • memory/3108-23-0x0000000001F90000-0x0000000001F96000-memory.dmp

        Filesize

        24KB

      • memory/3108-44-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-43-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-42-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3108-40-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-39-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-38-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-37-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-35-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-34-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-33-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-31-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-32-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-30-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-29-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-27-0x0000000001FA0000-0x0000000001FB0000-memory.dmp

        Filesize

        64KB

      • memory/3108-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3548-12-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3548-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3548-17-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB