Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:14

General

  • Target

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe

  • Size

    227KB

  • MD5

    1010b86bd744c31ecef5f5aeae5ca6df

  • SHA1

    79dbaab22a85e8a0c3124d39423da1ca24c358e8

  • SHA256

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de

  • SHA512

    6823068623029c10aa0d833be8422b6d93663832d24298bd9811f7700bbc56dc5463fd75f12273e2168bac6784a16e735cc86cf0de8841e83c1befc75bdfd02d

  • SSDEEP

    3072:BG/VLLNVnlMoDjq0sg0lpb15L76ZhBUrIeGskK+KgPcf53whT5A/hTu:8Lh9ljdOlPB6tUrIK+zPcRaCpT

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 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe
    "C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2904
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\utuluuot\
      2⤵
        PID:2772
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eydbwzwy.exe" C:\Windows\SysWOW64\utuluuot\
        2⤵
          PID:3036
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create utuluuot binPath= "C:\Windows\SysWOW64\utuluuot\eydbwzwy.exe /d\"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2668
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description utuluuot "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start utuluuot
          2⤵
          • Launches sc.exe
          PID:2956
        • 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:2656
      • C:\Windows\SysWOW64\utuluuot\eydbwzwy.exe
        C:\Windows\SysWOW64\utuluuot\eydbwzwy.exe /d"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2912
        • 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:2404

      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\eydbwzwy.exe
        Filesize

        13.5MB

        MD5

        6be005aef8bf3553071f6816cff95ce8

        SHA1

        f87febcef922cab69cbb2616495a0c5ead947151

        SHA256

        9e72ef62c22d228623f08f8fb838410bca337ed5e50518972ec70f3b25e56144

        SHA512

        7ed56f923c35bb6250b4cfdfa1df5526c1be57c30ace8daf0aa50a7151f070783599c042d8f47c8ffddfc44e68b31aa671ee38ef122a574fc0115cc685fc103f

      • memory/2404-35-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-50-0x0000000000210000-0x0000000000215000-memory.dmp
        Filesize

        20KB

      • memory/2404-62-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2404-58-0x0000000000220000-0x0000000000227000-memory.dmp
        Filesize

        28KB

      • memory/2404-57-0x00000000058E0000-0x0000000005CEB000-memory.dmp
        Filesize

        4.0MB

      • memory/2404-54-0x00000000058E0000-0x0000000005CEB000-memory.dmp
        Filesize

        4.0MB

      • memory/2404-33-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2404-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2404-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2404-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2404-53-0x0000000000210000-0x0000000000215000-memory.dmp
        Filesize

        20KB

      • memory/2404-21-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2404-23-0x0000000001930000-0x0000000001B3F000-memory.dmp
        Filesize

        2.1MB

      • memory/2404-27-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/2404-26-0x0000000001930000-0x0000000001B3F000-memory.dmp
        Filesize

        2.1MB

      • memory/2404-30-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-36-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-49-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-48-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-34-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-37-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-38-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-39-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-40-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-41-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-42-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-43-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-44-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-45-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-46-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2404-47-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2904-4-0x0000000000400000-0x0000000002B11000-memory.dmp
        Filesize

        39.1MB

      • memory/2904-1-0x0000000002C90000-0x0000000002D90000-memory.dmp
        Filesize

        1024KB

      • memory/2904-10-0x0000000002C90000-0x0000000002D90000-memory.dmp
        Filesize

        1024KB

      • memory/2904-6-0x0000000000400000-0x0000000002B11000-memory.dmp
        Filesize

        39.1MB

      • memory/2904-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2912-15-0x0000000000400000-0x0000000002B11000-memory.dmp
        Filesize

        39.1MB

      • memory/2912-18-0x0000000000400000-0x0000000002B11000-memory.dmp
        Filesize

        39.1MB

      • memory/2912-9-0x0000000002C00000-0x0000000002D00000-memory.dmp
        Filesize

        1024KB