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
    03-09-2024 16:57

General

  • Target

    ybyrikeu.exe

  • Size

    14.6MB

  • MD5

    ca17b0424f909bdc349dc3d80afe6e7f

  • SHA1

    e158fea33819fdbb6c106c1b0a53bff446008c54

  • SHA256

    83dc7a944be536ebd5cdda86381f84235930e36be9fea78504e0a997763ace58

  • SHA512

    f2d7c03b64e2ee0ca64d1b5dc57c2bd4eb44d9b77c9e4e4cce7a6672648b6676f9f78ba5bac79733aa5cdbeb0d6bfbe5064581fd3bf4d8dc5c9b73c795b67906

  • SSDEEP

    6144:kc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:k1OZDisvwdaxO0PuG1R4CWs

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\ybyrikeu.exe
    "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4724
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\usfcgnio\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1092
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bvaytwtv.exe" C:\Windows\SysWOW64\usfcgnio\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2476
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create usfcgnio binPath= "C:\Windows\SysWOW64\usfcgnio\bvaytwtv.exe /d\"C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5068
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description usfcgnio "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3844
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start usfcgnio
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1644
    • 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:2108
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4724 -s 1100
      2⤵
      • Program crash
      PID:5004
  • C:\Windows\SysWOW64\usfcgnio\bvaytwtv.exe
    C:\Windows\SysWOW64\usfcgnio\bvaytwtv.exe /d"C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2772
    • 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:1548
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2772 -s 540
      2⤵
      • Program crash
      PID:2416
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4724 -ip 4724
    1⤵
      PID:944
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2772 -ip 2772
      1⤵
        PID:3712

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        13.2MB

        MD5

        e57a5315db5b3da0b971e2204829cdf3

        SHA1

        254167052622579b0b66b8ebf34b96a440f6133d

        SHA256

        f3c90301c22862add8e9c59e4204d3e7bb309507ec8199db4a8791561d8c0534

        SHA512

        2842d99eef72ef2b418392978ab859c073d8ddea678dfd55ba2edfac45de137badcd1f81a923796082f65e4401c9b29f54271b3fc0a24133cbe4f3cd797c862b

      • memory/1548-47-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/1548-24-0x0000000002730000-0x0000000002736000-memory.dmp

        Filesize

        24KB

      • memory/1548-23-0x0000000003000000-0x000000000320F000-memory.dmp

        Filesize

        2.1MB

      • memory/1548-45-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-27-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-30-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-31-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-13-0x00000000012C0000-0x00000000012D5000-memory.dmp

        Filesize

        84KB

      • memory/1548-46-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-32-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-16-0x00000000012C0000-0x00000000012D5000-memory.dmp

        Filesize

        84KB

      • memory/1548-33-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-20-0x0000000003000000-0x000000000320F000-memory.dmp

        Filesize

        2.1MB

      • memory/1548-55-0x00000000027E0000-0x00000000027E7000-memory.dmp

        Filesize

        28KB

      • memory/1548-54-0x0000000007F80000-0x000000000838B000-memory.dmp

        Filesize

        4.0MB

      • memory/1548-51-0x0000000007F80000-0x000000000838B000-memory.dmp

        Filesize

        4.0MB

      • memory/1548-50-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/1548-34-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-15-0x00000000012C0000-0x00000000012D5000-memory.dmp

        Filesize

        84KB

      • memory/1548-35-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-39-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-43-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-42-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-41-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-40-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-44-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-38-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-37-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/1548-36-0x0000000002740000-0x0000000002750000-memory.dmp

        Filesize

        64KB

      • memory/2772-18-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/2772-12-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/2772-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4724-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4724-1-0x0000000000890000-0x0000000000990000-memory.dmp

        Filesize

        1024KB

      • memory/4724-8-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4724-10-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4724-9-0x0000000000870000-0x0000000000883000-memory.dmp

        Filesize

        76KB

      • memory/4724-2-0x0000000000870000-0x0000000000883000-memory.dmp

        Filesize

        76KB