Analysis

  • max time kernel
    147s
  • max time network
    154s
  • 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 14:49

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.

  • 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\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe
    "C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3584
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ygczlyzx\
      2⤵
        PID:1580
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ichfadac.exe" C:\Windows\SysWOW64\ygczlyzx\
        2⤵
          PID:3964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ygczlyzx binPath= "C:\Windows\SysWOW64\ygczlyzx\ichfadac.exe /d\"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4080
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ygczlyzx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ygczlyzx
          2⤵
          • Launches sc.exe
          PID:5040
        • 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:3828
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3584 -s 1044
          2⤵
          • Program crash
          PID:1592
      • C:\Windows\SysWOW64\ygczlyzx\ichfadac.exe
        C:\Windows\SysWOW64\ygczlyzx\ichfadac.exe /d"C:\Users\Admin\AppData\Local\Temp\9dc0085f64473ca82753f59552bae76c64b5165e72899d727cd18f4d1afbd9d1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4904
        • 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:4012
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4904 -s 512
          2⤵
          • Program crash
          PID:2276
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4904 -ip 4904
        1⤵
          PID:556
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3584 -ip 3584
          1⤵
            PID:4024

          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\ichfadac.exe
            Filesize

            10.0MB

            MD5

            59c7e0ac20f109db13b6d73112462876

            SHA1

            d89d3b1db0c62ed1a161468a7962bb992fd95b05

            SHA256

            2e2fc3c25ae1706c4bcdeb3ae0bc1f9fdb275ad1f9f9d1b2764996addac53073

            SHA512

            7f69bfacdbc4422837c33460ffac6b3fb17924299b99af37dad939fc3e4b38fc1b1383a4c97ad36a98fc6578e4cf9e2df8a8d23c4a1bb4cac087b81a8485b45c

          • memory/3584-16-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3584-2-0x00000000006D0000-0x00000000006E3000-memory.dmp
            Filesize

            76KB

          • memory/3584-3-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3584-1-0x0000000000740000-0x0000000000840000-memory.dmp
            Filesize

            1024KB

          • memory/4012-33-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-35-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-10-0x0000000000E80000-0x0000000000E95000-memory.dmp
            Filesize

            84KB

          • memory/4012-14-0x0000000000E80000-0x0000000000E95000-memory.dmp
            Filesize

            84KB

          • memory/4012-59-0x0000000000E80000-0x0000000000E95000-memory.dmp
            Filesize

            84KB

          • memory/4012-55-0x0000000002FF0000-0x0000000002FF7000-memory.dmp
            Filesize

            28KB

          • memory/4012-17-0x0000000000E80000-0x0000000000E95000-memory.dmp
            Filesize

            84KB

          • memory/4012-18-0x0000000000E80000-0x0000000000E95000-memory.dmp
            Filesize

            84KB

          • memory/4012-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4012-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4012-24-0x00000000021F0000-0x00000000021F6000-memory.dmp
            Filesize

            24KB

          • memory/4012-27-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-30-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-31-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-32-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-54-0x0000000007A40000-0x0000000007E4B000-memory.dmp
            Filesize

            4.0MB

          • memory/4012-34-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-51-0x0000000007A40000-0x0000000007E4B000-memory.dmp
            Filesize

            4.0MB

          • memory/4012-36-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-37-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-38-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-39-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-40-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-41-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-42-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-43-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-44-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-45-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-46-0x0000000002D50000-0x0000000002D60000-memory.dmp
            Filesize

            64KB

          • memory/4012-47-0x0000000002FE0000-0x0000000002FE5000-memory.dmp
            Filesize

            20KB

          • memory/4012-50-0x0000000002FE0000-0x0000000002FE5000-memory.dmp
            Filesize

            20KB

          • memory/4904-11-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/4904-8-0x0000000000470000-0x0000000000570000-memory.dmp
            Filesize

            1024KB

          • memory/4904-9-0x00000000005B0000-0x00000000005C3000-memory.dmp
            Filesize

            76KB

          • memory/4904-15-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB