Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    05-09-2024 01:45

General

  • Target

    bb3a5c0114dc8dbc9fce30575cb5f0bf2709253a66ebfb8809a88d50490a5b36.exe

  • Size

    213KB

  • MD5

    b89aff3b390a672343dc60c215c28bdb

  • SHA1

    e3828b70636ed31eacdcbae862d8d5487f78cd90

  • SHA256

    bb3a5c0114dc8dbc9fce30575cb5f0bf2709253a66ebfb8809a88d50490a5b36

  • SHA512

    177c7babcbcb801e4f879e07a3a7591eceae64bd938aa47182a23ba0dd4e36541fed6590326f22623f4775fc7b8b3b359efb775376eb7a9682ae373d3330a5eb

  • SSDEEP

    3072:mSKC+fip7D1JpMrTMWqdNmOyjzUcLzxJzQlfDKNShs5bQ:Yfip7D1Jp6A1gOKLa2Aw

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
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bb3a5c0114dc8dbc9fce30575cb5f0bf2709253a66ebfb8809a88d50490a5b36.exe
    "C:\Users\Admin\AppData\Local\Temp\bb3a5c0114dc8dbc9fce30575cb5f0bf2709253a66ebfb8809a88d50490a5b36.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1108
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\khaqxbli\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wdgbauuo.exe" C:\Windows\SysWOW64\khaqxbli\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1848
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create khaqxbli binPath= "C:\Windows\SysWOW64\khaqxbli\wdgbauuo.exe /d\"C:\Users\Admin\AppData\Local\Temp\bb3a5c0114dc8dbc9fce30575cb5f0bf2709253a66ebfb8809a88d50490a5b36.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4768
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description khaqxbli "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4172
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start khaqxbli
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1416
    • 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:1400
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1108 -s 620
      2⤵
      • Program crash
      PID:4004
  • C:\Windows\SysWOW64\khaqxbli\wdgbauuo.exe
    C:\Windows\SysWOW64\khaqxbli\wdgbauuo.exe /d"C:\Users\Admin\AppData\Local\Temp\bb3a5c0114dc8dbc9fce30575cb5f0bf2709253a66ebfb8809a88d50490a5b36.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4816
    • 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:1492
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4816 -s 556
      2⤵
      • Program crash
      PID:2232
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1108 -ip 1108
    1⤵
      PID:2228
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 4816 -ip 4816
      1⤵
        PID:2076

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        10.4MB

        MD5

        14ea4d54580ae3871ebce1bdffed7bcc

        SHA1

        f5929d87f9f8bf4ef6253eccbc071a55b9cabae8

        SHA256

        1972f8e7debad77e36a40dd0550a10d70177b62d423efec53d66dca771429191

        SHA512

        3294d0c8c9496d31613328005b50b19c60ccf0fb1abe04b0db12bece87f523bf13514e66636238017164fb8bccb00d987672098ecf5b4e996880bb5bf1017037

      • memory/1108-1-0x00000000006C0000-0x00000000007C0000-memory.dmp

        Filesize

        1024KB

      • memory/1108-2-0x00000000006A0000-0x00000000006B3000-memory.dmp

        Filesize

        76KB

      • memory/1108-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1108-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1108-7-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB

      • memory/1108-8-0x00000000006A0000-0x00000000006B3000-memory.dmp

        Filesize

        76KB

      • memory/1492-31-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-27-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-14-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1492-37-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-39-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-18-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1492-36-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-35-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-34-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-33-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-32-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-11-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1492-30-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-29-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-28-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-13-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1492-24-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-21-0x0000000001970000-0x0000000001976000-memory.dmp

        Filesize

        24KB

      • memory/1492-20-0x0000000002200000-0x000000000240F000-memory.dmp

        Filesize

        2.1MB

      • memory/1492-42-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-41-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-40-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-44-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/1492-51-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/1492-52-0x00000000019E0000-0x00000000019E7000-memory.dmp

        Filesize

        28KB

      • memory/1492-48-0x0000000007100000-0x000000000750B000-memory.dmp

        Filesize

        4.0MB

      • memory/1492-47-0x00000000019D0000-0x00000000019D5000-memory.dmp

        Filesize

        20KB

      • memory/1492-43-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/1492-38-0x0000000001980000-0x0000000001990000-memory.dmp

        Filesize

        64KB

      • memory/4816-15-0x0000000000400000-0x000000000043C000-memory.dmp

        Filesize

        240KB