Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-09-2024 01:16

General

  • Target

    3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363.exe

  • Size

    397KB

  • MD5

    f403202fb853377ceb67200005ef95b8

  • SHA1

    1840e1495486209e92e5230cf1406f31a02699e7

  • SHA256

    3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363

  • SHA512

    13b130d6f2ac8be444e16d4b1116812179d5043912a7aa24bd0d566eeecf4447be09fd54266dc12ff1902569d048c93a2d0c827abc135b0159f8156c18f9bf7a

  • SSDEEP

    6144:7BYOcLH6/xNtFxaS3DpwmEIey0bGWEbje2bkln5eOy8:76Ocb6/r/xv2GWaeaklQT8

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\3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363.exe
    "C:\Users\Admin\AppData\Local\Temp\3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2608
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\quvbozsn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5048
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qxehwkdn.exe" C:\Windows\SysWOW64\quvbozsn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2088
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create quvbozsn binPath= "C:\Windows\SysWOW64\quvbozsn\qxehwkdn.exe /d\"C:\Users\Admin\AppData\Local\Temp\3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1892
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description quvbozsn "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3228
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start quvbozsn
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:828
    • 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:448
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2608 -s 1048
      2⤵
      • Program crash
      PID:2928
  • C:\Windows\SysWOW64\quvbozsn\qxehwkdn.exe
    C:\Windows\SysWOW64\quvbozsn\qxehwkdn.exe /d"C:\Users\Admin\AppData\Local\Temp\3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2972
    • 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:3016
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2972 -s 512
      2⤵
      • Program crash
      PID:1796
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2608 -ip 2608
    1⤵
      PID:1676
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 2972 -ip 2972
      1⤵
        PID:4132

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        13.1MB

        MD5

        0187d9e7e0760ef35b405ea2910a7602

        SHA1

        4b95cb8d60bf2ee90de3c4c20e7b143c3d72eaec

        SHA256

        00b448c415c985075ab5079fd7ed8a8d8ca0bd8a177eebd1fca354de38616fcd

        SHA512

        9087097d6a6f68d21dfbe16f07a59c010b680e215f836a9554fe48e66edec31919f961a6aa11c1b3a635f45e9c59c2465d40f17c20b7c2b8a78bed5612ef534d

      • memory/2608-2-0x0000000002620000-0x0000000002633000-memory.dmp

        Filesize

        76KB

      • memory/2608-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2608-8-0x0000000002620000-0x0000000002633000-memory.dmp

        Filesize

        76KB

      • memory/2608-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2608-7-0x0000000000400000-0x000000000247B000-memory.dmp

        Filesize

        32.5MB

      • memory/2608-1-0x00000000026A0000-0x00000000027A0000-memory.dmp

        Filesize

        1024KB

      • memory/2972-15-0x0000000000400000-0x000000000247B000-memory.dmp

        Filesize

        32.5MB

      • memory/3016-42-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-37-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-13-0x00000000005D0000-0x00000000005E5000-memory.dmp

        Filesize

        84KB

      • memory/3016-17-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/3016-52-0x00000000029D0000-0x00000000029D7000-memory.dmp

        Filesize

        28KB

      • memory/3016-51-0x0000000007400000-0x000000000780B000-memory.dmp

        Filesize

        4.0MB

      • memory/3016-48-0x0000000007400000-0x000000000780B000-memory.dmp

        Filesize

        4.0MB

      • memory/3016-47-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

        Filesize

        20KB

      • memory/3016-44-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

        Filesize

        20KB

      • memory/3016-43-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-11-0x00000000005D0000-0x00000000005E5000-memory.dmp

        Filesize

        84KB

      • memory/3016-41-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-40-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-39-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-38-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-14-0x00000000005D0000-0x00000000005E5000-memory.dmp

        Filesize

        84KB

      • memory/3016-36-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-35-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-34-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-33-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-32-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-31-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-30-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-29-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-28-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-27-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-24-0x0000000001BA0000-0x0000000001BB0000-memory.dmp

        Filesize

        64KB

      • memory/3016-21-0x0000000001B90000-0x0000000001B96000-memory.dmp

        Filesize

        24KB

      • memory/3016-20-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB