Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20240220-en
  • resource tags

    arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 14:14

General

  • Target

    9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe

  • Size

    233KB

  • MD5

    e1fd44ce08b0383dc59e732bb0b1f2d9

  • SHA1

    70dc0dba88f5b4d02f554627ec8fce32b9237fcc

  • SHA256

    9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1

  • SHA512

    7db8ae6bbead6c8603fda377b70cf05f793a795ca29cef50a97c6df148c4ecf5677880177016d7e65e51b204bbeed22b07e31f9d021305ea7a350b7130121d0d

  • SSDEEP

    3072:TcYelBc/ctFykDqPogVwsvhQNW3k1QxCJ18YcRfIBvd4rm5qe4EY3jXO9ZJwVQk:TcdBJ+PojEk1QEJq1FIBv74E2OTF

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 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).

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe
    "C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2968
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\crsmboez\
      2⤵
        PID:3000
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bnzebhgu.exe" C:\Windows\SysWOW64\crsmboez\
        2⤵
          PID:2432
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create crsmboez binPath= "C:\Windows\SysWOW64\crsmboez\bnzebhgu.exe /d\"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2468
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description crsmboez "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2464
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start crsmboez
          2⤵
          • Launches sc.exe
          PID:2612
        • 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
          PID:2336
      • C:\Windows\SysWOW64\crsmboez\bnzebhgu.exe
        C:\Windows\SysWOW64\crsmboez\bnzebhgu.exe /d"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2500
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2428

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Privilege Escalation

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Defense Evasion

      Impair Defenses

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\bnzebhgu.exe
        Filesize

        10.6MB

        MD5

        c2754ca227547485e39d2af7b071623c

        SHA1

        8ff67c097428520088b2fc3d28a521f58a6a5d33

        SHA256

        43b809ccb3f13092272969e5977333691c793a389843d1e80ca747aea14faacf

        SHA512

        f4e17e10f12ad2ccf0110177835455eccf002011852321b2ae70d0d7ffdaaf1b3cba4f15099bf32409a370515787d55069d0b25c87fe5704e35418c24159fbe4

      • memory/2428-48-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-39-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2428-57-0x00000000001A0000-0x00000000001A7000-memory.dmp
        Filesize

        28KB

      • memory/2428-56-0x0000000005980000-0x0000000005D8B000-memory.dmp
        Filesize

        4.0MB

      • memory/2428-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2428-49-0x0000000000190000-0x0000000000195000-memory.dmp
        Filesize

        20KB

      • memory/2428-13-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2428-53-0x0000000005980000-0x0000000005D8B000-memory.dmp
        Filesize

        4.0MB

      • memory/2428-17-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2428-32-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2428-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2428-22-0x0000000001A00000-0x0000000001C0F000-memory.dmp
        Filesize

        2.1MB

      • memory/2428-25-0x0000000001A00000-0x0000000001C0F000-memory.dmp
        Filesize

        2.1MB

      • memory/2428-26-0x0000000000110000-0x0000000000116000-memory.dmp
        Filesize

        24KB

      • memory/2428-29-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-47-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-10-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2428-33-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-52-0x0000000000190000-0x0000000000195000-memory.dmp
        Filesize

        20KB

      • memory/2428-46-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-45-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-44-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-43-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-42-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-41-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-40-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-34-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-38-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-37-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-36-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2428-35-0x0000000000170000-0x0000000000180000-memory.dmp
        Filesize

        64KB

      • memory/2500-14-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2500-9-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2500-8-0x00000000008A0000-0x00000000009A0000-memory.dmp
        Filesize

        1024KB

      • memory/2968-1-0x0000000000560000-0x0000000000660000-memory.dmp
        Filesize

        1024KB

      • memory/2968-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2968-18-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2968-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB