Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/10/2023, 01:42

General

  • Target

    1a9f34a4410437ddb1a2d8051099d92990751e9743b1b1a4d909fa0113da0e07.exe

  • Size

    179KB

  • MD5

    652f00b6afd02c149a52a299ee2d2455

  • SHA1

    dfc353413a54c37aeb1a190bdacae61c19e2e63d

  • SHA256

    1a9f34a4410437ddb1a2d8051099d92990751e9743b1b1a4d909fa0113da0e07

  • SHA512

    28c7a881bb6b0f072ca8bcd41276f978f9dbaada71ff12e1d0b66c903a17c58a9c00e4d6c115a5de285238b2b9790da4e82554fec82ba88bd6d0943171bd0d1f

  • SSDEEP

    3072:cyBNbfgueA8c9TnxCBqKbWQeev6sMODgeP9NUU7qQPoxdc30YbQBX:/uTA8oTnYMKbWQ35MOc6cUKdCz

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
  • 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).

  • GoLang User-Agent 1 IoCs

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

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1a9f34a4410437ddb1a2d8051099d92990751e9743b1b1a4d909fa0113da0e07.exe
    "C:\Users\Admin\AppData\Local\Temp\1a9f34a4410437ddb1a2d8051099d92990751e9743b1b1a4d909fa0113da0e07.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jmgbryfw\
      2⤵
        PID:4560
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zgjedxxr.exe" C:\Windows\SysWOW64\jmgbryfw\
        2⤵
          PID:2144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jmgbryfw binPath= "C:\Windows\SysWOW64\jmgbryfw\zgjedxxr.exe /d\"C:\Users\Admin\AppData\Local\Temp\1a9f34a4410437ddb1a2d8051099d92990751e9743b1b1a4d909fa0113da0e07.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jmgbryfw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2460
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jmgbryfw
          2⤵
          • Launches sc.exe
          PID:5064
        • 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:4072
      • C:\Windows\SysWOW64\jmgbryfw\zgjedxxr.exe
        C:\Windows\SysWOW64\jmgbryfw\zgjedxxr.exe /d"C:\Users\Admin\AppData\Local\Temp\1a9f34a4410437ddb1a2d8051099d92990751e9743b1b1a4d909fa0113da0e07.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3796
        • 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:1420

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        13.4MB

        MD5

        619cb6fe1f18e81c264d9371ff7ab8ad

        SHA1

        ac4bf54f171ba1c3514638c73725e0289c419635

        SHA256

        be26e8f8979f7fb4acab0d597dee9b343fd7c19a67c0b97bea73054fd2aa183d

        SHA512

        f262295011d322c8329bf440b598b9cd786a670814577c5d06b8489f0c1e762319b4cea23c0f73a6f68ce3620bbd80a1993bc4744f111ac9af3381c00153bf39

      • C:\Windows\SysWOW64\jmgbryfw\zgjedxxr.exe

        Filesize

        13.4MB

        MD5

        619cb6fe1f18e81c264d9371ff7ab8ad

        SHA1

        ac4bf54f171ba1c3514638c73725e0289c419635

        SHA256

        be26e8f8979f7fb4acab0d597dee9b343fd7c19a67c0b97bea73054fd2aa183d

        SHA512

        f262295011d322c8329bf440b598b9cd786a670814577c5d06b8489f0c1e762319b4cea23c0f73a6f68ce3620bbd80a1993bc4744f111ac9af3381c00153bf39

      • memory/1420-44-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-34-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-56-0x00000000031F0000-0x00000000031F7000-memory.dmp

        Filesize

        28KB

      • memory/1420-55-0x0000000007D80000-0x000000000818B000-memory.dmp

        Filesize

        4.0MB

      • memory/1420-52-0x0000000007D80000-0x000000000818B000-memory.dmp

        Filesize

        4.0MB

      • memory/1420-51-0x00000000031E0000-0x00000000031E5000-memory.dmp

        Filesize

        20KB

      • memory/1420-48-0x00000000031E0000-0x00000000031E5000-memory.dmp

        Filesize

        20KB

      • memory/1420-12-0x0000000001060000-0x0000000001075000-memory.dmp

        Filesize

        84KB

      • memory/1420-47-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-35-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-18-0x0000000001060000-0x0000000001075000-memory.dmp

        Filesize

        84KB

      • memory/1420-20-0x0000000001060000-0x0000000001075000-memory.dmp

        Filesize

        84KB

      • memory/1420-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/1420-24-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/1420-25-0x00000000011F0000-0x00000000011F6000-memory.dmp

        Filesize

        24KB

      • memory/1420-28-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-31-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-32-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-46-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-33-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-17-0x0000000001060000-0x0000000001075000-memory.dmp

        Filesize

        84KB

      • memory/1420-36-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-37-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-38-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-39-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-40-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-41-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-42-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-45-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/1420-43-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3796-16-0x0000000000400000-0x00000000007B6000-memory.dmp

        Filesize

        3.7MB

      • memory/3796-11-0x0000000000400000-0x00000000007B6000-memory.dmp

        Filesize

        3.7MB

      • memory/3796-10-0x00000000007D0000-0x00000000008D0000-memory.dmp

        Filesize

        1024KB

      • memory/3936-1-0x00000000007C0000-0x00000000008C0000-memory.dmp

        Filesize

        1024KB

      • memory/3936-4-0x0000000000400000-0x00000000007B6000-memory.dmp

        Filesize

        3.7MB

      • memory/3936-8-0x0000000002500000-0x0000000002513000-memory.dmp

        Filesize

        76KB

      • memory/3936-7-0x0000000000400000-0x00000000007B6000-memory.dmp

        Filesize

        3.7MB

      • memory/3936-2-0x0000000002500000-0x0000000002513000-memory.dmp

        Filesize

        76KB