Analysis

  • max time kernel
    208s
  • max time network
    228s
  • 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 13:33

General

  • Target

    fd79a1b3b18fca2696c2c58f290a4dadb97e3cdcd6e98d14a63ac3f4a1f2e351.exe

  • Size

    288KB

  • MD5

    8bcf8cc2c1f767e639cfd2de9ad3d548

  • SHA1

    bb80c8229723373216bac840f0604402f594bd89

  • SHA256

    fd79a1b3b18fca2696c2c58f290a4dadb97e3cdcd6e98d14a63ac3f4a1f2e351

  • SHA512

    d890e14d6b46f6a1da5f95acf24f5c9f2da575191c7dbfd15f634715dd612847844d59f3191585ec53c147182bf6d5a8f556ff6bb971cf2c3aab90c63d8ca156

  • SSDEEP

    6144:xecopGFVVZLpU7ZKeo24OazMN/6TMybRXMA:x+pGFfZlU7tokD69bph

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 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\fd79a1b3b18fca2696c2c58f290a4dadb97e3cdcd6e98d14a63ac3f4a1f2e351.exe
    "C:\Users\Admin\AppData\Local\Temp\fd79a1b3b18fca2696c2c58f290a4dadb97e3cdcd6e98d14a63ac3f4a1f2e351.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1780
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cclerher\
      2⤵
        PID:1216
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dgzkktuu.exe" C:\Windows\SysWOW64\cclerher\
        2⤵
          PID:2348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cclerher binPath= "C:\Windows\SysWOW64\cclerher\dgzkktuu.exe /d\"C:\Users\Admin\AppData\Local\Temp\fd79a1b3b18fca2696c2c58f290a4dadb97e3cdcd6e98d14a63ac3f4a1f2e351.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:208
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cclerher "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cclerher
          2⤵
          • Launches sc.exe
          PID:1132
        • 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:4736
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1780 -s 1336
          2⤵
          • Program crash
          PID:3412
      • C:\Windows\SysWOW64\cclerher\dgzkktuu.exe
        C:\Windows\SysWOW64\cclerher\dgzkktuu.exe /d"C:\Users\Admin\AppData\Local\Temp\fd79a1b3b18fca2696c2c58f290a4dadb97e3cdcd6e98d14a63ac3f4a1f2e351.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1956
        • 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:3696
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1956 -s 512
          2⤵
          • Program crash
          PID:3816
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1780 -ip 1780
        1⤵
          PID:1664
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 1956 -ip 1956
          1⤵
            PID:3172

          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\dgzkktuu.exe
            Filesize

            10.7MB

            MD5

            20ec13d702a03b3a4ba19adf810f4b1b

            SHA1

            b95dd6fada1f60abbc45b3147383d86beaac38d2

            SHA256

            b4162e5a2a51647c1f8278a06ef76addfbe0a7c3acdd6b3d6aed83dba20ae0ff

            SHA512

            6821315a0ed2086ae88bd83760698952545102d136f246f5ef80f56f2db1546949db1888f37c4e422df7a0864f6da85767174204dc259e5d1e07c7e90212f5b1

          • memory/1780-2-0x00000000005F0000-0x0000000000603000-memory.dmp
            Filesize

            76KB

          • memory/1780-4-0x0000000000400000-0x0000000000450000-memory.dmp
            Filesize

            320KB

          • memory/1780-6-0x0000000000400000-0x0000000000450000-memory.dmp
            Filesize

            320KB

          • memory/1780-9-0x0000000000400000-0x0000000000450000-memory.dmp
            Filesize

            320KB

          • memory/1780-1-0x0000000000630000-0x0000000000730000-memory.dmp
            Filesize

            1024KB

          • memory/1956-18-0x0000000000400000-0x0000000000450000-memory.dmp
            Filesize

            320KB

          • memory/1956-11-0x00000000005A0000-0x00000000005B3000-memory.dmp
            Filesize

            76KB

          • memory/1956-10-0x00000000006D0000-0x00000000007D0000-memory.dmp
            Filesize

            1024KB

          • memory/1956-12-0x0000000000400000-0x0000000000450000-memory.dmp
            Filesize

            320KB

          • memory/3696-34-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-40-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-19-0x0000000000B70000-0x0000000000B85000-memory.dmp
            Filesize

            84KB

          • memory/3696-20-0x0000000000B70000-0x0000000000B85000-memory.dmp
            Filesize

            84KB

          • memory/3696-21-0x0000000000B70000-0x0000000000B85000-memory.dmp
            Filesize

            84KB

          • memory/3696-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3696-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3696-27-0x00000000023A0000-0x00000000023A6000-memory.dmp
            Filesize

            24KB

          • memory/3696-30-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-33-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-13-0x0000000000B70000-0x0000000000B85000-memory.dmp
            Filesize

            84KB

          • memory/3696-35-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-36-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-37-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-38-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-17-0x0000000000B70000-0x0000000000B85000-memory.dmp
            Filesize

            84KB

          • memory/3696-39-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-41-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-42-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-43-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-45-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-44-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-47-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-46-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-48-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-49-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/3696-50-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/3696-53-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/3696-54-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/3696-57-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/3696-58-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB