Analysis

  • max time kernel
    148s
  • max time network
    159s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    02-09-2024 14:46

General

  • Target

    bEsOrli29K.exe

  • Size

    213KB

  • MD5

    a3247152e18ba6e88311f082a86515d3

  • SHA1

    80da2f14bb17f2d3ff1df6faf25622ebb8cf00c8

  • SHA256

    02c6f9163a5d988cee3ab12c11e03b18329c26d6b4863004f943133654693e97

  • SHA512

    b09fc49d7126b37c37f499be522c4b57e7538d2f64600bd789c93d90a315a023f0fbed9466c6069a38bb8c80bc9a6b250fcaec03b59ecfb3a40754c235c3e6d8

  • SSDEEP

    3072:AOFL8HN3BB33u/iMUk6efofpWqX2hnesi5kb:tLqN3Bt36iM/ofpKhn9

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\bEsOrli29K.exe
    "C:\Users\Admin\AppData\Local\Temp\bEsOrli29K.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3684
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oqzplahg\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4300
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zppmykay.exe" C:\Windows\SysWOW64\oqzplahg\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4460
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create oqzplahg binPath= "C:\Windows\SysWOW64\oqzplahg\zppmykay.exe /d\"C:\Users\Admin\AppData\Local\Temp\bEsOrli29K.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4308
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description oqzplahg "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1536
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start oqzplahg
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1680
    • 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:2476
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3684 -s 1280
      2⤵
      • Program crash
      PID:3008
  • C:\Windows\SysWOW64\oqzplahg\zppmykay.exe
    C:\Windows\SysWOW64\oqzplahg\zppmykay.exe /d"C:\Users\Admin\AppData\Local\Temp\bEsOrli29K.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3708
    • 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:3476
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3708 -s 564
      2⤵
      • Program crash
      PID:2540
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 3684 -ip 3684
    1⤵
      PID:3720
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3708 -ip 3708
      1⤵
        PID:3124

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        12.9MB

        MD5

        3a8b90799aa464a4edd662802cca1fc0

        SHA1

        22046903b790b73b69c8e96298f308f7c0d83a24

        SHA256

        283d5cac79a89ef8d12e64817d2cd0486b3c615dc39ea28a34f336575505b202

        SHA512

        d1724e2b816334f29f93aca8ce8fa642da6e4cd164078701877f755b9c589d32bc0c3b17c6a686a56d49f8d9c1981e0c2185a15d98558ef0459a9f27f66f13b9

      • memory/3476-38-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-40-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-15-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/3476-37-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-17-0x0000000002E00000-0x000000000300F000-memory.dmp

        Filesize

        2.1MB

      • memory/3476-11-0x0000000000F80000-0x0000000000F95000-memory.dmp

        Filesize

        84KB

      • memory/3476-10-0x0000000000F80000-0x0000000000F95000-memory.dmp

        Filesize

        84KB

      • memory/3476-36-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-26-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-44-0x00000000033E0000-0x00000000033E5000-memory.dmp

        Filesize

        20KB

      • memory/3476-49-0x00000000033F0000-0x00000000033F7000-memory.dmp

        Filesize

        28KB

      • memory/3476-48-0x0000000007E00000-0x000000000820B000-memory.dmp

        Filesize

        4.0MB

      • memory/3476-45-0x0000000007E00000-0x000000000820B000-memory.dmp

        Filesize

        4.0MB

      • memory/3476-35-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-39-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-18-0x00000000013F0000-0x00000000013F6000-memory.dmp

        Filesize

        24KB

      • memory/3476-8-0x0000000000F80000-0x0000000000F95000-memory.dmp

        Filesize

        84KB

      • memory/3476-21-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-41-0x00000000033E0000-0x00000000033E5000-memory.dmp

        Filesize

        20KB

      • memory/3476-34-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-33-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-32-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-31-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-30-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-29-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-28-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-27-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-25-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3476-24-0x0000000003110000-0x0000000003120000-memory.dmp

        Filesize

        64KB

      • memory/3684-5-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB

      • memory/3684-1-0x00007FFD8C6C0000-0x00007FFD8C8C9000-memory.dmp

        Filesize

        2.0MB

      • memory/3684-6-0x00007FFD8C6C0000-0x00007FFD8C8C9000-memory.dmp

        Filesize

        2.0MB

      • memory/3708-12-0x0000000000400000-0x0000000000448000-memory.dmp

        Filesize

        288KB