Analysis

  • max time kernel
    149s
  • max time network
    151s
  • 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 14:14

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 6 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:4540
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dtninjh\
      2⤵
        PID:2084
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pwviqqyc.exe" C:\Windows\SysWOW64\dtninjh\
        2⤵
          PID:956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dtninjh binPath= "C:\Windows\SysWOW64\dtninjh\pwviqqyc.exe /d\"C:\Users\Admin\AppData\Local\Temp\43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dtninjh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4960
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dtninjh
          2⤵
          • Launches sc.exe
          PID:4880
        • 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:1096
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4540 -s 792
          2⤵
          • Program crash
          PID:1740
      • C:\Windows\SysWOW64\dtninjh\pwviqqyc.exe
        C:\Windows\SysWOW64\dtninjh\pwviqqyc.exe /d"C:\Users\Admin\AppData\Local\Temp\43428294fd339a6c66b4ba9af723593f386808db747f2b2ba7a0dc0117379171.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4456
        • 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:4464
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4456 -s 532
          2⤵
          • Program crash
          PID:3748
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4540 -ip 4540
        1⤵
          PID:1840
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 4456 -ip 4456
          1⤵
            PID:3016

          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\pwviqqyc.exe
            Filesize

            12.7MB

            MD5

            e14f49988423a9d7ac5c01cdb7281ddf

            SHA1

            7c1df63cd8627ee7adac0f7ccd62fa59a8e76993

            SHA256

            ed18eb5e876423d52dcb87a7e5428ec3eaac9a55d236bb8a4ba828ed140097d3

            SHA512

            9a834d982869d548c0f63f86393c9d7b33820411869ede01e20c508b9e71229f3f9404621d0baaeaadf3cc901446d3168aed49cd3cdf9cf6bb9784ed3f46fab2

          • memory/4456-18-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4456-11-0x0000000000660000-0x0000000000760000-memory.dmp
            Filesize

            1024KB

          • memory/4456-12-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4464-56-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/4464-31-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-60-0x0000000000790000-0x00000000007A5000-memory.dmp
            Filesize

            84KB

          • memory/4464-51-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/4464-16-0x0000000000790000-0x00000000007A5000-memory.dmp
            Filesize

            84KB

          • memory/4464-19-0x0000000000790000-0x00000000007A5000-memory.dmp
            Filesize

            84KB

          • memory/4464-48-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/4464-17-0x0000000000790000-0x00000000007A5000-memory.dmp
            Filesize

            84KB

          • memory/4464-32-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-33-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-21-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4464-28-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-25-0x0000000001D40000-0x0000000001D46000-memory.dmp
            Filesize

            24KB

          • memory/4464-24-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4464-42-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-52-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/4464-34-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-55-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/4464-13-0x0000000000790000-0x00000000007A5000-memory.dmp
            Filesize

            84KB

          • memory/4464-35-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-46-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-47-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-45-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-44-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-43-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-41-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-40-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-39-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-38-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-37-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4464-36-0x0000000001D50000-0x0000000001D60000-memory.dmp
            Filesize

            64KB

          • memory/4540-8-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4540-1-0x0000000000760000-0x0000000000860000-memory.dmp
            Filesize

            1024KB

          • memory/4540-2-0x0000000000550000-0x0000000000563000-memory.dmp
            Filesize

            76KB

          • memory/4540-4-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4540-6-0x0000000000400000-0x000000000043E000-memory.dmp
            Filesize

            248KB

          • memory/4540-9-0x0000000000550000-0x0000000000563000-memory.dmp
            Filesize

            76KB