Analysis

  • max time kernel
    145s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-11-2024 02:09

General

  • Target

    a2ec5b450e99f6ed3e965ba8c5c92eafb1bec8b0db255fd27340d48602488a58.exe

  • Size

    288KB

  • MD5

    9e125786a86974b62a002190eb597e63

  • SHA1

    7689e4ee11a586d89abe6f9ca712a01faeef2e07

  • SHA256

    a2ec5b450e99f6ed3e965ba8c5c92eafb1bec8b0db255fd27340d48602488a58

  • SHA512

    d9ef2479b59767bd7122c85588b6dedde8a2a3dd920051466163a460317c0dea4b9e22c673c8de03d52ab23477f97db5f40642b5c00ae8dddf77b549b7a197ce

  • SSDEEP

    6144:Fh40QUH+s8/rfkZlHIP50yrz7PYKpaZwxuN:FhBHX8/rfkzoR7rz7Pb8Zag

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.

  • Tofsee family
  • 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
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\a2ec5b450e99f6ed3e965ba8c5c92eafb1bec8b0db255fd27340d48602488a58.exe
    "C:\Users\Admin\AppData\Local\Temp\a2ec5b450e99f6ed3e965ba8c5c92eafb1bec8b0db255fd27340d48602488a58.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3032
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ewkupycs\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2104
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybuffopp.exe" C:\Windows\SysWOW64\ewkupycs\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4236
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ewkupycs binPath= "C:\Windows\SysWOW64\ewkupycs\ybuffopp.exe /d\"C:\Users\Admin\AppData\Local\Temp\a2ec5b450e99f6ed3e965ba8c5c92eafb1bec8b0db255fd27340d48602488a58.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4448
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ewkupycs "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3652
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ewkupycs
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4360
    • 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
      • System Location Discovery: System Language Discovery
      PID:1064
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3032 -s 1236
      2⤵
      • Program crash
      PID:4484
  • C:\Windows\SysWOW64\ewkupycs\ybuffopp.exe
    C:\Windows\SysWOW64\ewkupycs\ybuffopp.exe /d"C:\Users\Admin\AppData\Local\Temp\a2ec5b450e99f6ed3e965ba8c5c92eafb1bec8b0db255fd27340d48602488a58.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2124
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:2480
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2124 -s 524
      2⤵
      • Program crash
      PID:4216
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 2124 -ip 2124
    1⤵
      PID:2940
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 3032 -ip 3032
      1⤵
        PID:3052

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.9MB

        MD5

        0290562b374382a608a6bc03dd712be0

        SHA1

        adbe15e5766a3d060db21a9eb295586f328b2865

        SHA256

        308ec51698929e1fc3d44f97ac3e578664b96464ef8551b08a40c48164544e30

        SHA512

        684c5b64ee70e58af9e5e6e4d328e79e9f84c27ca460a63af546b87454bc8434b85558a65890cbe5a089bf3a0f8e48991cc15891ce67a9021931793555bf5e57

      • memory/2124-10-0x0000000000400000-0x0000000002D27000-memory.dmp

        Filesize

        41.2MB

      • memory/2480-41-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-32-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-8-0x00000000004B0000-0x00000000004C5000-memory.dmp

        Filesize

        84KB

      • memory/2480-40-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-21-0x0000000001970000-0x0000000001976000-memory.dmp

        Filesize

        24KB

      • memory/2480-39-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-30-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-14-0x00000000004B0000-0x00000000004C5000-memory.dmp

        Filesize

        84KB

      • memory/2480-15-0x00000000004B0000-0x00000000004C5000-memory.dmp

        Filesize

        84KB

      • memory/2480-49-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/2480-52-0x00000000019E0000-0x00000000019E7000-memory.dmp

        Filesize

        28KB

      • memory/2480-51-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/2480-47-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/2480-44-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/2480-43-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-42-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-18-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2480-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/2480-24-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-38-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-37-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-36-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-35-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-34-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-33-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-27-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-31-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-29-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/2480-28-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/3032-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3032-1-0x0000000002DF0000-0x0000000002EF0000-memory.dmp

        Filesize

        1024KB

      • memory/3032-12-0x0000000002DC0000-0x0000000002DD3000-memory.dmp

        Filesize

        76KB

      • memory/3032-11-0x0000000000400000-0x0000000002D27000-memory.dmp

        Filesize

        41.2MB

      • memory/3032-2-0x0000000002DC0000-0x0000000002DD3000-memory.dmp

        Filesize

        76KB

      • memory/3032-13-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB