Analysis

  • max time kernel
    196s
  • max time network
    217s
  • 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

    43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe

  • Size

    235KB

  • MD5

    85899a98881db336949f636dfd6f3d5b

  • SHA1

    6b59c57d02a4fa9f503e064585e6dba562c63a8f

  • SHA256

    43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171

  • SHA512

    df506d5fd86ae2c7c906b328e25d99d0362eda272eb0a4381449a836c69acf999d5942fabfc4960529482a98b8c71f6eadec1ca153de2e2d4f8042c50bfa69db

  • SSDEEP

    3072:j72kySmwWaXJVCadJizA1KSB2sxhXM3tl64C5ARvc:j7236qahM3tLc

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\43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe
    "C:\Users\Admin\AppData\Local\Temp\43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nsgaazqd\
      2⤵
        PID:3988
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fdsatjea.exe" C:\Windows\SysWOW64\nsgaazqd\
        2⤵
          PID:4444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nsgaazqd binPath= "C:\Windows\SysWOW64\nsgaazqd\fdsatjea.exe /d\"C:\Users\Admin\AppData\Local\Temp\43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:740
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nsgaazqd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4584
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nsgaazqd
          2⤵
          • Launches sc.exe
          PID:3788
        • 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:3272
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 400 -s 656
          2⤵
          • Program crash
          PID:368
      • C:\Windows\SysWOW64\nsgaazqd\fdsatjea.exe
        C:\Windows\SysWOW64\nsgaazqd\fdsatjea.exe /d"C:\Users\Admin\AppData\Local\Temp\43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1540
        • 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:4364
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1540 -s 520
          2⤵
          • Program crash
          PID:3888
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 400 -ip 400
        1⤵
          PID:4148
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1540 -ip 1540
          1⤵
            PID:3988

          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\fdsatjea.exe
            Filesize

            12.6MB

            MD5

            a52b3a2fa726c20b8976b56c929017d5

            SHA1

            cd6cf63ac9a15d8a7696a1d060ae8321553a69fa

            SHA256

            2d13955d79a7ba7b742bc31da1cda37f8fdc19018e62936d62bf51053ad38ded

            SHA512

            4d77738fa1f3f1aa5eb0e3c50642a03ef88998ccd804bda7002876847adab7c82895724318c4a0df865ab66cd5b8ddb2a623354427b24a0d8f6e4648a41ab8eb

          • memory/400-2-0x00000000006C0000-0x00000000007C0000-memory.dmp
            Filesize

            1024KB

          • memory/400-3-0x0000000000590000-0x00000000005A3000-memory.dmp
            Filesize

            76KB

          • memory/400-4-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/400-8-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/400-1-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/1540-17-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/1540-12-0x00000000004C0000-0x00000000005C0000-memory.dmp
            Filesize

            1024KB

          • memory/1540-13-0x0000000000D30000-0x0000000000D43000-memory.dmp
            Filesize

            76KB

          • memory/1540-14-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4364-36-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-40-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-21-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/4364-22-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/4364-23-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/4364-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4364-25-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/4364-29-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4364-30-0x00000000023A0000-0x00000000023A6000-memory.dmp
            Filesize

            24KB

          • memory/4364-33-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-15-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/4364-37-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-38-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-39-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-41-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-20-0x0000000000EF0000-0x0000000000F05000-memory.dmp
            Filesize

            84KB

          • memory/4364-42-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-43-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-44-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-45-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-46-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-47-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-48-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-49-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-50-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-51-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-52-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/4364-53-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/4364-56-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/4364-57-0x0000000007B00000-0x0000000007F0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4364-60-0x0000000007B00000-0x0000000007F0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4364-61-0x0000000002FE0000-0x0000000002FE7000-memory.dmp
            Filesize

            28KB