Analysis

  • max time kernel
    140s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:20

General

  • Target

    f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe

  • Size

    232KB

  • MD5

    b5f3dc95c09fa3bfdf009a404736f94e

  • SHA1

    03e471e7edf9bbcbe2483ebd1ba05364c93a190a

  • SHA256

    f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be

  • SHA512

    f63cba660384d5296e2f8aeeceba1a2d4707311a242cd5f12220008670cb5c2bf686b546fafe03cc6c5363bd62fe4c067a1f9dc73a8388488e13854b631ee546

  • SSDEEP

    6144:j6zxC0r84BWnfZUH7SFcQU+9HFsvKMXOCU:kY0r9BeZUbSiy9HSvKwO

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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).

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe
    "C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1460
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lcevdto\
      2⤵
        PID:2844
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nzhekxdb.exe" C:\Windows\SysWOW64\lcevdto\
        2⤵
          PID:2496
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lcevdto binPath= "C:\Windows\SysWOW64\lcevdto\nzhekxdb.exe /d\"C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lcevdto "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2512
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lcevdto
          2⤵
          • Launches sc.exe
          PID:2612
        • 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:2412
      • C:\Windows\SysWOW64\lcevdto\nzhekxdb.exe
        C:\Windows\SysWOW64\lcevdto\nzhekxdb.exe /d"C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2576
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2500

      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

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        15.0MB

        MD5

        f44f69d78aad786fbc297fcf265de68e

        SHA1

        bcc3c9d615c2c24225bc983907a15eefa9606536

        SHA256

        2aba6b094595c6a5476d933095f082150eb1efdb2d1ec25ccd977536b837c0c5

        SHA512

        bbedfe84db02a0d447f953847da9814f97a4fb52f0620e706dca71a73868c58868d63733dcb0532568aa14d88189b4f483a5b0b1be867d992d4156f7f84bbb08

      • memory/1460-1-0x0000000000550000-0x0000000000650000-memory.dmp
        Filesize

        1024KB

      • memory/1460-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/1460-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1460-7-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2500-44-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-36-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2500-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2500-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2500-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2500-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2500-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2500-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2500-22-0x0000000001A80000-0x0000000001C8F000-memory.dmp
        Filesize

        2.1MB

      • memory/2500-25-0x0000000001A80000-0x0000000001C8F000-memory.dmp
        Filesize

        2.1MB

      • memory/2500-26-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/2500-29-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-32-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-33-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-34-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-35-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-57-0x00000000001E0000-0x00000000001E7000-memory.dmp
        Filesize

        28KB

      • memory/2500-37-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-38-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-39-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-40-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-41-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-42-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-43-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-56-0x0000000005880000-0x0000000005C8B000-memory.dmp
        Filesize

        4.0MB

      • memory/2500-45-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-46-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-48-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-47-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2500-49-0x00000000001D0000-0x00000000001D5000-memory.dmp
        Filesize

        20KB

      • memory/2500-52-0x00000000001D0000-0x00000000001D5000-memory.dmp
        Filesize

        20KB

      • memory/2500-53-0x0000000005880000-0x0000000005C8B000-memory.dmp
        Filesize

        4.0MB

      • memory/2576-10-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2576-9-0x00000000005C0000-0x00000000006C0000-memory.dmp
        Filesize

        1024KB

      • memory/2576-16-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB