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Analysis

  • max time kernel
    142s
  • max time network
    146s
  • platform
    windows7_x64
  • resource
    win7-20230712-en
  • resource tags

    arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
  • submitted
    07/08/2023, 04:30

General

  • Target

    file.exe

  • Size

    295KB

  • MD5

    d23526d5cd20f9798f82ef630510838c

  • SHA1

    531bac0c65fd2209651295dab9e71085f3e2950d

  • SHA256

    81841275b53476b892ba3da736e05c01392b7f79f6fbb679fbb344f1433cc11e

  • SHA512

    d49de33f3b81280d5bf0bc429e9508438de71dec43deb995956d684131df724017c152e2e27b8983dc5c6c7a6d440f1bc86bc80c1c0e9d2aa22ab79019b2e0b5

  • SSDEEP

    3072:NoN2WdiJsjnhu+snkoBgaUCeboSuZXuPPdhVCe2TJXweU5VeNzGZ:qNWUnhuntvUISeEPNAJXweQVe4

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 1 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 5 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pjtvbpm\
      2⤵
        PID:1620
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mygdjwca.exe" C:\Windows\SysWOW64\pjtvbpm\
        2⤵
          PID:2804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pjtvbpm binPath= "C:\Windows\SysWOW64\pjtvbpm\mygdjwca.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2836
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pjtvbpm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2364
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pjtvbpm
          2⤵
          • Launches sc.exe
          PID:2828
        • 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:2172
      • C:\Windows\SysWOW64\pjtvbpm\mygdjwca.exe
        C:\Windows\SysWOW64\pjtvbpm\mygdjwca.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2812
        • 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:624

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\mygdjwca.exe

        Filesize

        10.7MB

        MD5

        d9e33852200d560087685de0d00ebef1

        SHA1

        024d1a0f9fda1a7b7f0b3e3fe5331a6961ac9066

        SHA256

        45ad378d16d724c97db197e0ed9b0aee1f971fff633abc5b4817e102f8e9fb34

        SHA512

        1a8e416c15e7f461133b8bbfe482a6754520f57e76321b79a60be06b9731dc4c93b8e6bccb0e2c7b70c281d34aeec774b99a1ebaa57d5bb04acd7f28dfe97240

      • C:\Windows\SysWOW64\pjtvbpm\mygdjwca.exe

        Filesize

        10.7MB

        MD5

        d9e33852200d560087685de0d00ebef1

        SHA1

        024d1a0f9fda1a7b7f0b3e3fe5331a6961ac9066

        SHA256

        45ad378d16d724c97db197e0ed9b0aee1f971fff633abc5b4817e102f8e9fb34

        SHA512

        1a8e416c15e7f461133b8bbfe482a6754520f57e76321b79a60be06b9731dc4c93b8e6bccb0e2c7b70c281d34aeec774b99a1ebaa57d5bb04acd7f28dfe97240

      • memory/624-110-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-100-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-101-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-124-0x00000000002F0000-0x00000000002F7000-memory.dmp

        Filesize

        28KB

      • memory/624-123-0x0000000005460000-0x000000000586B000-memory.dmp

        Filesize

        4.0MB

      • memory/624-120-0x0000000005460000-0x000000000586B000-memory.dmp

        Filesize

        4.0MB

      • memory/624-119-0x0000000000170000-0x0000000000175000-memory.dmp

        Filesize

        20KB

      • memory/624-67-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        Filesize

        4KB

      • memory/624-65-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/624-116-0x0000000000170000-0x0000000000175000-memory.dmp

        Filesize

        20KB

      • memory/624-115-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-80-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/624-114-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-85-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/624-86-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/624-88-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/624-89-0x00000000018F0000-0x0000000001AFF000-memory.dmp

        Filesize

        2.1MB

      • memory/624-92-0x00000000018F0000-0x0000000001AFF000-memory.dmp

        Filesize

        2.1MB

      • memory/624-93-0x0000000000150000-0x0000000000156000-memory.dmp

        Filesize

        24KB

      • memory/624-96-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-113-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-99-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-112-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-102-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-103-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-104-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-105-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-106-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-107-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-108-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-109-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/624-111-0x0000000000160000-0x0000000000170000-memory.dmp

        Filesize

        64KB

      • memory/1400-56-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/1400-55-0x0000000002750000-0x0000000002850000-memory.dmp

        Filesize

        1024KB

      • memory/1400-58-0x0000000000400000-0x00000000022F0000-memory.dmp

        Filesize

        30.9MB

      • memory/1400-61-0x0000000000400000-0x00000000022F0000-memory.dmp

        Filesize

        30.9MB

      • memory/1400-62-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/2812-82-0x0000000000400000-0x00000000022F0000-memory.dmp

        Filesize

        30.9MB

      • memory/2812-69-0x00000000002B0000-0x00000000003B0000-memory.dmp

        Filesize

        1024KB

      • memory/2812-68-0x0000000000400000-0x00000000022F0000-memory.dmp

        Filesize

        30.9MB

      • memory/2812-66-0x0000000000400000-0x00000000022F0000-memory.dmp

        Filesize

        30.9MB

      • memory/2812-64-0x00000000002B0000-0x00000000003B0000-memory.dmp

        Filesize

        1024KB