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Analysis

  • max time kernel
    149s
  • max time network
    151s
  • 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, 15:42

General

  • Target

    8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe

  • Size

    423KB

  • MD5

    5e8fb462e0765bfb0df856d1f935eb2d

  • SHA1

    51eb283017b44ab8f0c3f8c5ce7e0d9662ebcafd

  • SHA256

    8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8

  • SHA512

    2a6696b5305ef2d3e8e2adf8f6a9f0d3d88e839e36e3cd38ad5254f3dcc157ce5618590bb1e5e5fa8f91460f18b6ed4c958a6aa8d4486a298e68cfc2be284e2d

  • SSDEEP

    6144:2atMBDDhWsqnwG4fA5BEivtQ9rqh+eUOrPotfV:2AMBDDhvqwG95BEi1iqh+UwD

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe
    "C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1700
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pcrocmnm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2372
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zczsjlfv.exe" C:\Windows\SysWOW64\pcrocmnm\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1632
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create pcrocmnm binPath= "C:\Windows\SysWOW64\pcrocmnm\zczsjlfv.exe /d\"C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1768
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description pcrocmnm "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4756
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start pcrocmnm
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1408
    • 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:4904
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1700 -s 1308
      2⤵
      • Program crash
      PID:444
  • C:\Windows\SysWOW64\pcrocmnm\zczsjlfv.exe
    C:\Windows\SysWOW64\pcrocmnm\zczsjlfv.exe /d"C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1836
    • 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:3176
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1836 -s 544
      2⤵
      • Program crash
      PID:916
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1700 -ip 1700
    1⤵
      PID:1272
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 1836 -ip 1836
      1⤵
        PID:3460

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        13.3MB

        MD5

        3546683a25adb7de0ae050bf9340fd3b

        SHA1

        4849e41ec9f28ea4ee11b8588acaf005255f87ed

        SHA256

        614556809c80df5d442997cda3f9fb9abb9a36bf35d3697389430b07e29b3ad8

        SHA512

        ebe332b1a29f43b0e840e262f90d861416e11f4a922ab8d4ca2ca1584c68dc64c4965d785dc86cbf619d22bc171b30e80b85e6af4c836f6dce8aef12aef5c550

      • memory/1700-2-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/1700-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1700-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1700-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/1700-8-0x0000000002440000-0x0000000002453000-memory.dmp

        Filesize

        76KB

      • memory/1700-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

        Filesize

        1024KB

      • memory/1836-14-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/1836-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/1836-13-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3176-55-0x0000000002DF0000-0x0000000002DF7000-memory.dmp

        Filesize

        28KB

      • memory/3176-43-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-17-0x0000000000C70000-0x0000000000C85000-memory.dmp

        Filesize

        84KB

      • memory/3176-52-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3176-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3176-27-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-24-0x0000000000DF0000-0x0000000000DF6000-memory.dmp

        Filesize

        24KB

      • memory/3176-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3176-12-0x0000000000C70000-0x0000000000C85000-memory.dmp

        Filesize

        84KB

      • memory/3176-54-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3176-50-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

        Filesize

        20KB

      • memory/3176-47-0x0000000002DE0000-0x0000000002DE5000-memory.dmp

        Filesize

        20KB

      • memory/3176-45-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-46-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-44-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-16-0x0000000000C70000-0x0000000000C85000-memory.dmp

        Filesize

        84KB

      • memory/3176-41-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-42-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-40-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-39-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-37-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-38-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-36-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-35-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-34-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-33-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-32-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-31-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB

      • memory/3176-30-0x0000000002C10000-0x0000000002C20000-memory.dmp

        Filesize

        64KB