Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-09-2024 09:30

General

  • Target

    2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe

  • Size

    239KB

  • MD5

    002356e241ed93062ea8cf0c80e250de

  • SHA1

    e81f528cd1f782c03943f48d9c8496c60ae3433f

  • SHA256

    2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d

  • SHA512

    dcdc74eb2307329fdc3d00c4848e890c6f10f79ebea475efd0991aaf6a2ad46afb26ada642ff46e00d7cae491341a05d8f6622aae8695273d55e5e34921ede93

  • SSDEEP

    6144:MnucMBiyeneCyknMgs2Mkv/MJ0Vdh1tQ:Jc4iye5nS2MkrVdz

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\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe
    "C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:556
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uufhhxao\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2124
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\htfkhnma.exe" C:\Windows\SysWOW64\uufhhxao\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4912
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create uufhhxao binPath= "C:\Windows\SysWOW64\uufhhxao\htfkhnma.exe /d\"C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4104
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description uufhhxao "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3984
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start uufhhxao
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4600
    • 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:4820
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 556 -s 784
      2⤵
      • Program crash
      PID:2352
  • C:\Windows\SysWOW64\uufhhxao\htfkhnma.exe
    C:\Windows\SysWOW64\uufhhxao\htfkhnma.exe /d"C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1632
    • 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:4404
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1632 -s 508
      2⤵
      • Program crash
      PID:5088
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 556 -ip 556
    1⤵
      PID:552
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 1632 -ip 1632
      1⤵
        PID:1168

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.1MB

        MD5

        2ffe6be920b4b30397d6f30c5e73ccaa

        SHA1

        bdd00c21a7e8e880f7acce77ca86148fbbc40ccb

        SHA256

        8854698e3b0d272dd3f638697e8c74602d6cc11b7b43864ac9d48427af24b749

        SHA512

        8e22d016ff7b1243eb43223a6d15b550c7b29998d28cf5ec0b5320644d3faa0f8a0683ab4268a4769a64ee7d58e6ace48476a6d0a9d52672db4e8a9f67e47711

      • memory/556-2-0x0000000002190000-0x00000000021A3000-memory.dmp

        Filesize

        76KB

      • memory/556-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/556-8-0x0000000002190000-0x00000000021A3000-memory.dmp

        Filesize

        76KB

      • memory/556-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/556-7-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB

      • memory/556-1-0x0000000000520000-0x0000000000620000-memory.dmp

        Filesize

        1024KB

      • memory/1632-19-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB

      • memory/1632-12-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB

      • memory/1632-11-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB

      • memory/1632-13-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB

      • memory/4404-46-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-39-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-16-0x00000000004E0000-0x00000000004F5000-memory.dmp

        Filesize

        84KB

      • memory/4404-53-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/4404-56-0x00000000025D0000-0x00000000025D7000-memory.dmp

        Filesize

        28KB

      • memory/4404-55-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/4404-51-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/4404-48-0x00000000019F0000-0x00000000019F5000-memory.dmp

        Filesize

        20KB

      • memory/4404-47-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-14-0x00000000004E0000-0x00000000004F5000-memory.dmp

        Filesize

        84KB

      • memory/4404-45-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-43-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-42-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-41-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-40-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-17-0x00000000004E0000-0x00000000004F5000-memory.dmp

        Filesize

        84KB

      • memory/4404-38-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-37-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-36-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-35-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-34-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-33-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-31-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-24-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/4404-44-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-32-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-22-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/4404-28-0x00000000019A0000-0x00000000019B0000-memory.dmp

        Filesize

        64KB

      • memory/4404-25-0x0000000001990000-0x0000000001996000-memory.dmp

        Filesize

        24KB