Analysis

  • max time kernel
    150s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:34

General

  • Target

    58892f621a5b05339536004b2102cac88ea63b2148b784ea7a4745c27633444b.exe

  • Size

    244KB

  • MD5

    9e93e282ed9483fa5278557953accc51

  • SHA1

    48f5f7ab95997f0482c1f5259e8e4ca7d96df2b8

  • SHA256

    58892f621a5b05339536004b2102cac88ea63b2148b784ea7a4745c27633444b

  • SHA512

    bbe4ec3158e98d9fdba29694f355fb13cb5a7232599db0c14abb0bcf70a1921e9e0c590e9c2c9182b900d3c4b29e361397ab9eb14f9570de6dfcceb27a1965b2

  • SSDEEP

    3072:s/5SqeWVD3RRzOpABGPwgOnNnSU59mTYlCroDan0/3gmvfg3kwjwC/b:ABJ3XO6cYgOnNnP59mUBa0lfJe/

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) 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\58892f621a5b05339536004b2102cac88ea63b2148b784ea7a4745c27633444b.exe
    "C:\Users\Admin\AppData\Local\Temp\58892f621a5b05339536004b2102cac88ea63b2148b784ea7a4745c27633444b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2888
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\juhdukzz\
      2⤵
        PID:4112
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wuefhdgm.exe" C:\Windows\SysWOW64\juhdukzz\
        2⤵
          PID:2520
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create juhdukzz binPath= "C:\Windows\SysWOW64\juhdukzz\wuefhdgm.exe /d\"C:\Users\Admin\AppData\Local\Temp\58892f621a5b05339536004b2102cac88ea63b2148b784ea7a4745c27633444b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description juhdukzz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4256
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start juhdukzz
          2⤵
          • Launches sc.exe
          PID:1872
        • 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:4972
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2888 -s 1236
          2⤵
          • Program crash
          PID:4776
      • C:\Windows\SysWOW64\juhdukzz\wuefhdgm.exe
        C:\Windows\SysWOW64\juhdukzz\wuefhdgm.exe /d"C:\Users\Admin\AppData\Local\Temp\58892f621a5b05339536004b2102cac88ea63b2148b784ea7a4745c27633444b.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2804
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2132
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2804 -s 512
          2⤵
          • Program crash
          PID:1560
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2888 -ip 2888
        1⤵
          PID:1068
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2804 -ip 2804
          1⤵
            PID:768

          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

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            12.1MB

            MD5

            8ab8cf3647f189dd5bc0c256fa8784db

            SHA1

            e0b0a7a12ce248cfe7b72c6f22c30634effa406d

            SHA256

            7f2510cf4b68b681730e3da0c5ae70b7cc454ea42e848c8b86d248ac1c8cd88f

            SHA512

            1e8ede37c6cd08b0546c6fc69694a7009a369d4f00a51d5820cb1ee1be6999b9d9b0e738cf02ef7b5d354af272a5da05ea306fa956a1ebc3c798449db1a4fce0

          • memory/2132-36-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-47-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-56-0x0000000002BE0000-0x0000000002BE7000-memory.dmp
            Filesize

            28KB

          • memory/2132-31-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-33-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-34-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-43-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-12-0x00000000008F0000-0x0000000000905000-memory.dmp
            Filesize

            84KB

          • memory/2132-15-0x00000000008F0000-0x0000000000905000-memory.dmp
            Filesize

            84KB

          • memory/2132-16-0x00000000008F0000-0x0000000000905000-memory.dmp
            Filesize

            84KB

          • memory/2132-45-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-18-0x00000000008F0000-0x0000000000905000-memory.dmp
            Filesize

            84KB

          • memory/2132-20-0x00000000008F0000-0x0000000000905000-memory.dmp
            Filesize

            84KB

          • memory/2132-35-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-24-0x0000000002700000-0x000000000290F000-memory.dmp
            Filesize

            2.1MB

          • memory/2132-25-0x0000000001BE0000-0x0000000001BE6000-memory.dmp
            Filesize

            24KB

          • memory/2132-28-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-32-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-55-0x0000000007740000-0x0000000007B4B000-memory.dmp
            Filesize

            4.0MB

          • memory/2132-44-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-21-0x0000000002700000-0x000000000290F000-memory.dmp
            Filesize

            2.1MB

          • memory/2132-39-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-38-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-41-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-40-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-42-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-37-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-48-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
            Filesize

            20KB

          • memory/2132-46-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2132-51-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
            Filesize

            20KB

          • memory/2132-52-0x0000000007740000-0x0000000007B4B000-memory.dmp
            Filesize

            4.0MB

          • memory/2804-17-0x0000000000400000-0x00000000007C6000-memory.dmp
            Filesize

            3.8MB

          • memory/2804-11-0x0000000000400000-0x00000000007C6000-memory.dmp
            Filesize

            3.8MB

          • memory/2804-10-0x00000000009D0000-0x0000000000AD0000-memory.dmp
            Filesize

            1024KB

          • memory/2888-4-0x0000000000400000-0x00000000007C6000-memory.dmp
            Filesize

            3.8MB

          • memory/2888-1-0x0000000000990000-0x0000000000A90000-memory.dmp
            Filesize

            1024KB

          • memory/2888-8-0x0000000000970000-0x0000000000983000-memory.dmp
            Filesize

            76KB

          • memory/2888-7-0x0000000000400000-0x00000000007C6000-memory.dmp
            Filesize

            3.8MB

          • memory/2888-2-0x0000000000970000-0x0000000000983000-memory.dmp
            Filesize

            76KB