Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-07-2024 01:23

General

  • Target

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe

  • Size

    164KB

  • MD5

    c20fa0ab6b79f5d972c8ce22fa9c52b1

  • SHA1

    a4684e4d865d543a2a498f034af4c9d2c1b6261a

  • SHA256

    3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a

  • SHA512

    3ace193785b00978e06d8dc5a7db3872a7e719c2c8b2b2da07ffcdbe3f9a1188962f974b9d2fb1ed4c0e0f93cf33b575ca5d2b27019dab301bb1e21a181e5a94

  • SSDEEP

    3072:++/LImiO24Vvt0JiGcFaw/5uCvZMt/2PE9w:3/LIP63GcRasP

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) 2 TTPs
  • Modifies Windows Firewall 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe
    "C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2408
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\woxzhjaq\
      2⤵
        PID:4464
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bzjkmilr.exe" C:\Windows\SysWOW64\woxzhjaq\
        2⤵
          PID:780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create woxzhjaq binPath= "C:\Windows\SysWOW64\woxzhjaq\bzjkmilr.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2016
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description woxzhjaq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1708
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start woxzhjaq
          2⤵
          • Launches sc.exe
          PID:4176
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:2364
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2408 -s 576
          2⤵
          • Program crash
          PID:2624
      • C:\Windows\SysWOW64\woxzhjaq\bzjkmilr.exe
        C:\Windows\SysWOW64\woxzhjaq\bzjkmilr.exe /d"C:\Users\Admin\AppData\Local\Temp\3b55d16d4573718b2bd722914b09e4096c7ca4ea6ca8c735a003988cb633bc1a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:540
        • 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:1680
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 540 -s 512
          2⤵
          • Program crash
          PID:3172
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 2408 -ip 2408
        1⤵
          PID:4852
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 540 -ip 540
          1⤵
            PID:2356

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            14.3MB

            MD5

            5d9f3fc860e78a35c230e01ad9351e73

            SHA1

            871e8c79602332ee7ec84be3d3400d93d95450ee

            SHA256

            b1fa0f448cec0ce69de78065c3e540ec43cf28c1c4113a9e4aa09c5ccf10fc52

            SHA512

            d1c69ddaca3d58b53e122457bb132fc1435c8bb29628d73c933416524e02b1bbc96a9d37a5e0dd0fda48766c15d56da92c4c2f21f753054a7785ff319295d446

          • memory/540-11-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/540-17-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/540-12-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/1680-46-0x00000000031E0000-0x00000000031E5000-memory.dmp
            Filesize

            20KB

          • memory/1680-43-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-20-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/1680-23-0x00000000025F0000-0x00000000025F6000-memory.dmp
            Filesize

            24KB

          • memory/1680-26-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-13-0x0000000000F40000-0x0000000000F55000-memory.dmp
            Filesize

            84KB

          • memory/1680-15-0x0000000000F40000-0x0000000000F55000-memory.dmp
            Filesize

            84KB

          • memory/1680-16-0x0000000000F40000-0x0000000000F55000-memory.dmp
            Filesize

            84KB

          • memory/1680-29-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-22-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/1680-50-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/1680-54-0x00000000031F0000-0x00000000031F7000-memory.dmp
            Filesize

            28KB

          • memory/1680-53-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/1680-49-0x00000000031E0000-0x00000000031E5000-memory.dmp
            Filesize

            20KB

          • memory/1680-30-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-45-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-44-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-31-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-42-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-41-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-40-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-39-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-38-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-37-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-36-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-35-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-34-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-33-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/1680-32-0x0000000003010000-0x0000000003020000-memory.dmp
            Filesize

            64KB

          • memory/2408-9-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2408-1-0x0000000000640000-0x0000000000740000-memory.dmp
            Filesize

            1024KB

          • memory/2408-2-0x0000000002220000-0x0000000002233000-memory.dmp
            Filesize

            76KB

          • memory/2408-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/2408-7-0x0000000000400000-0x00000000004C4000-memory.dmp
            Filesize

            784KB

          • memory/2408-8-0x0000000002220000-0x0000000002233000-memory.dmp
            Filesize

            76KB