Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20231020-en
  • resource tags

    arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
  • submitted
    06/11/2023, 01:11

General

  • Target

    file.exe

  • Size

    221KB

  • MD5

    2488d90434caafc7d576e6e16220a772

  • SHA1

    9f72377d8cc4e561ae6172460df94b8d0f87ed9e

  • SHA256

    f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe

  • SHA512

    5ee948f1eeb8ba21cda44d781b616f96957b6f7a1951b0a4dfe6c7c881ae28d243722cf751209efa8e1e274fe392b0956ea1423ec6ed1efb7880b87e44aa5e18

  • SSDEEP

    3072:WHMfCYL/+qeVAeW5XNFJarDAJ98I2a9CZo2Y07LPd0RPGnllVP:WsfbLQIF00JWla92o2Y0foGnR

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 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 1 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).

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 2 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:2924
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gxyayzff\
      2⤵
        PID:1176
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cowtzmsq.exe" C:\Windows\SysWOW64\gxyayzff\
        2⤵
          PID:2244
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gxyayzff binPath= "C:\Windows\SysWOW64\gxyayzff\cowtzmsq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2700
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gxyayzff "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gxyayzff
          2⤵
          • Launches sc.exe
          PID:2708
        • 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:2932
      • C:\Windows\SysWOW64\gxyayzff\cowtzmsq.exe
        C:\Windows\SysWOW64\gxyayzff\cowtzmsq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2820
        • 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:2604

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              12.9MB

              MD5

              077ec0f2746f3e3aa0b8b2bfdd6deab3

              SHA1

              fd94f087ef88663cfd2d66952b834c62567312f6

              SHA256

              ea50118b7c16cc462069c92d972687faa7dbb9a242f849fb8a162e33c18929c0

              SHA512

              44efbfd6b362f973d9250b445c269e24fee13f4d1bf7d4ae16be4066c17581aa30494ccee3e5b200e2d25dc99eaf8e6880c9541380a4bb5daacb35d5a2300796

            • C:\Windows\SysWOW64\gxyayzff\cowtzmsq.exe

              Filesize

              12.9MB

              MD5

              077ec0f2746f3e3aa0b8b2bfdd6deab3

              SHA1

              fd94f087ef88663cfd2d66952b834c62567312f6

              SHA256

              ea50118b7c16cc462069c92d972687faa7dbb9a242f849fb8a162e33c18929c0

              SHA512

              44efbfd6b362f973d9250b445c269e24fee13f4d1bf7d4ae16be4066c17581aa30494ccee3e5b200e2d25dc99eaf8e6880c9541380a4bb5daacb35d5a2300796

            • memory/2604-15-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2604-29-0x0000000000110000-0x0000000000116000-memory.dmp

              Filesize

              24KB

            • memory/2604-28-0x0000000001940000-0x0000000001B4F000-memory.dmp

              Filesize

              2.1MB

            • memory/2604-25-0x0000000001940000-0x0000000001B4F000-memory.dmp

              Filesize

              2.1MB

            • memory/2604-24-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2604-22-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2604-21-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2604-14-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2604-17-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2820-13-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2820-18-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2820-12-0x00000000002F0000-0x00000000003F0000-memory.dmp

              Filesize

              1024KB

            • memory/2924-1-0x0000000000570000-0x0000000000670000-memory.dmp

              Filesize

              1024KB

            • memory/2924-9-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2924-8-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2924-7-0x00000000002D0000-0x00000000002E3000-memory.dmp

              Filesize

              76KB

            • memory/2924-6-0x0000000000570000-0x0000000000670000-memory.dmp

              Filesize

              1024KB

            • memory/2924-3-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2924-2-0x00000000002D0000-0x00000000002E3000-memory.dmp

              Filesize

              76KB