Resubmissions

13-09-2024 08:50

240913-krlpravbkn 10

12-09-2024 22:11

240912-14fl9syckf 10

Analysis

  • max time kernel
    118s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-09-2024 22:11

General

  • Target

    0fcd127ebda0d435dda364e977a26120N.exe

  • Size

    239KB

  • MD5

    0fcd127ebda0d435dda364e977a26120

  • SHA1

    37bbb15e2fe577db5023729e15924a61f30f63d7

  • SHA256

    63296be0fc8cedc36f814d05171e0cddf9186afa45ead6ec8632b7cbe4b06ccc

  • SHA512

    6afe29ec24c7e0ed32cb7515fd0db80bc63b0acdefa7cda0795636ac447792985e539986d932d3373e2ad765ae9edb47e1448b1d61806b116d75598b62b9f99c

  • SSDEEP

    3072:4Sa80fS61LJhEirDAo8IQAmiT1norJz6d4kkCbFCWs/x+/Q:+fS61LJhEE5QA5iJa4E/Q

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\0fcd127ebda0d435dda364e977a26120N.exe
    "C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1996
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ccaetlga\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1472
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zxhikgjp.exe" C:\Windows\SysWOW64\ccaetlga\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3992
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ccaetlga binPath= "C:\Windows\SysWOW64\ccaetlga\zxhikgjp.exe /d\"C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1704
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ccaetlga "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2412
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ccaetlga
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3964
    • 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:3132
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1996 -s 1044
      2⤵
      • Program crash
      PID:4944
  • C:\Windows\SysWOW64\ccaetlga\zxhikgjp.exe
    C:\Windows\SysWOW64\ccaetlga\zxhikgjp.exe /d"C:\Users\Admin\AppData\Local\Temp\0fcd127ebda0d435dda364e977a26120N.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4620
    • 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:3492
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4620 -s 516
      2⤵
      • Program crash
      PID:3800
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 1996 -ip 1996
    1⤵
      PID:3456
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 4620 -ip 4620
      1⤵
        PID:4140

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.5MB

        MD5

        125c65c95bd269b519b33bd8ee384de8

        SHA1

        fd126c7e16913156551f78d2ea3d965f71df5701

        SHA256

        99602a29cf6e9e828117d5291fff518af39e483dc901fb5f7a3767c6ff0c9561

        SHA512

        923fc6b619e7e9564d6c43c54d979f161d680f501748a839fd9e78d04bcdb0cc4a3868fdb1b1a57e2a158b3447089865d4dd58d7d4a6cd9c1833ee05046df4c5

      • memory/1996-1-0x0000000002C60000-0x0000000002D60000-memory.dmp

        Filesize

        1024KB

      • memory/1996-2-0x0000000002C20000-0x0000000002C33000-memory.dmp

        Filesize

        76KB

      • memory/1996-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1996-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1996-8-0x0000000002C20000-0x0000000002C33000-memory.dmp

        Filesize

        76KB

      • memory/1996-7-0x0000000000400000-0x0000000002B5C000-memory.dmp

        Filesize

        39.4MB

      • memory/3492-28-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-20-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/3492-14-0x00000000005D0000-0x00000000005E5000-memory.dmp

        Filesize

        84KB

      • memory/3492-36-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-35-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-34-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-33-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-32-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-31-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-30-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-29-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-11-0x00000000005D0000-0x00000000005E5000-memory.dmp

        Filesize

        84KB

      • memory/3492-27-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-24-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-21-0x00000000009F0000-0x00000000009F6000-memory.dmp

        Filesize

        24KB

      • memory/3492-13-0x00000000005D0000-0x00000000005E5000-memory.dmp

        Filesize

        84KB

      • memory/3492-52-0x0000000001BF0000-0x0000000001BF7000-memory.dmp

        Filesize

        28KB

      • memory/3492-37-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-18-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/3492-51-0x0000000007400000-0x000000000780B000-memory.dmp

        Filesize

        4.0MB

      • memory/3492-48-0x0000000007400000-0x000000000780B000-memory.dmp

        Filesize

        4.0MB

      • memory/3492-47-0x0000000001BE0000-0x0000000001BE5000-memory.dmp

        Filesize

        20KB

      • memory/3492-44-0x0000000001BE0000-0x0000000001BE5000-memory.dmp

        Filesize

        20KB

      • memory/3492-43-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-42-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-41-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-40-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-39-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/3492-38-0x0000000000DF0000-0x0000000000E00000-memory.dmp

        Filesize

        64KB

      • memory/4620-15-0x0000000000400000-0x0000000002B5C000-memory.dmp

        Filesize

        39.4MB