Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    04-09-2024 13:03

General

  • Target

    6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe

  • Size

    214KB

  • MD5

    8b9be712ba5f26a1f6369833d52193fb

  • SHA1

    187b0a0888114923e4f611ed90402d7bf0e21733

  • SHA256

    6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f

  • SHA512

    33c457fab7b2910452de37d2a263d46b2391bb4b34b0c37793b6f5875180e92cb2caebfb2ab08e72393b0230407505c94eef6b41040c1500b2b4393fb3b58d08

  • SSDEEP

    3072:YASCGfSRnbJBJ0IQALHFv0raVXyPg9a+lfB0pyTbQ:0fSRnbJBJTLlr04C6

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\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe
    "C:\Users\Admin\AppData\Local\Temp\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1904
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gyzgefku\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5008
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lfkidgdf.exe" C:\Windows\SysWOW64\gyzgefku\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1696
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create gyzgefku binPath= "C:\Windows\SysWOW64\gyzgefku\lfkidgdf.exe /d\"C:\Users\Admin\AppData\Local\Temp\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5028
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description gyzgefku "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3740
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start gyzgefku
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1100
    • 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:840
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1904 -s 1100
      2⤵
      • Program crash
      PID:1548
  • C:\Windows\SysWOW64\gyzgefku\lfkidgdf.exe
    C:\Windows\SysWOW64\gyzgefku\lfkidgdf.exe /d"C:\Users\Admin\AppData\Local\Temp\6b880d602f77fc4061a3f6b0a7619e9a8899d9e61eeeea4460eec1d900aeb66f.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2508
    • 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:2328
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2508 -s 556
      2⤵
      • Program crash
      PID:988
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 1904 -ip 1904
    1⤵
      PID:4940
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2508 -ip 2508
      1⤵
        PID:1688

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.8MB

        MD5

        c236d2218a862ee0231f40a380f9ea36

        SHA1

        229d986b224ce0d208e8e0e44bf595446baf9836

        SHA256

        889a577df6f9885d397cf842ee8dc8042664f77b17ad6a2099875ac469f5377d

        SHA512

        cbd70be8d8e06650cb86b3d8ab49aaf8eab868253b6e9426b6f2c5d9e5d3dcfe0efb198b471365e4556e52a05a24f6452578b70e661836f8989df2f9256688ce

      • memory/1904-2-0x00000000022A0000-0x00000000022B3000-memory.dmp

        Filesize

        76KB

      • memory/1904-1-0x00000000006C0000-0x00000000007C0000-memory.dmp

        Filesize

        1024KB

      • memory/1904-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1904-7-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB

      • memory/1904-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1904-8-0x00000000022A0000-0x00000000022B3000-memory.dmp

        Filesize

        76KB

      • memory/2328-41-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-37-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-14-0x00000000004F0000-0x0000000000505000-memory.dmp

        Filesize

        84KB

      • memory/2328-52-0x00000000019E0000-0x00000000019E7000-memory.dmp

        Filesize

        28KB

      • memory/2328-18-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2328-48-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/2328-51-0x0000000007200000-0x000000000760B000-memory.dmp

        Filesize

        4.0MB

      • memory/2328-47-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/2328-44-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/2328-43-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-42-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-11-0x00000000004F0000-0x0000000000505000-memory.dmp

        Filesize

        84KB

      • memory/2328-40-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-39-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-38-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-13-0x00000000004F0000-0x0000000000505000-memory.dmp

        Filesize

        84KB

      • memory/2328-36-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-35-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-34-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-33-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-32-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-31-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-30-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-29-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-28-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-27-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-24-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2328-21-0x0000000001970000-0x0000000001976000-memory.dmp

        Filesize

        24KB

      • memory/2328-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2508-15-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB