Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-09-2024 01:44

General

  • Target

    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe

  • Size

    213KB

  • MD5

    8e456f932787fcd0cadbb598174575b2

  • SHA1

    22b069c76b86bdb6be8cdafc78019b55c583062e

  • SHA256

    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5

  • SHA512

    cb26a33dacdcfe804bdd587ecd44b9bf1c59f357e8701fc4f5e1b04d8d8882466c7743fac51969fe8912e1197a5653986eb4a71edc35eee89051b6c98d546c9d

  • SSDEEP

    6144:MGDLD6Tj3Vyg0mwiRjaVlodEFjvn/Mq0Vdh1HQ:M+L2n3VygtzRWJjv+Vdz

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.

  • 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.

  • 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\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
    "C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:744
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lctamabz\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2184
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ugsxuazn.exe" C:\Windows\SysWOW64\lctamabz\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1328
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create lctamabz binPath= "C:\Windows\SysWOW64\lctamabz\ugsxuazn.exe /d\"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:564
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description lctamabz "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:828
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start lctamabz
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4200
    • 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:1900
  • C:\Windows\SysWOW64\lctamabz\ugsxuazn.exe
    C:\Windows\SysWOW64\lctamabz\ugsxuazn.exe /d"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1544
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3644

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    14.9MB

    MD5

    49671945c4eea708c3a53657cf461d36

    SHA1

    d8b8783baf6129e182b3a1f459024d33c0cba2af

    SHA256

    2a87d559b3d9ac4dd248b2d00294446e8e0b890ac661c2964e9ce2926388fbf7

    SHA512

    f1308be0be02a5a369ae497f6f99cd90595e172858f2b714e77df7453dcb8ef04ae8613e2534947902cfe512ae1f87704ae1bbd10572c3f944d6e3cf2b35f5c0

  • memory/744-2-0x0000000002040000-0x0000000002053000-memory.dmp

    Filesize

    76KB

  • memory/744-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/744-7-0x0000000000660000-0x0000000000760000-memory.dmp

    Filesize

    1024KB

  • memory/744-10-0x0000000002040000-0x0000000002053000-memory.dmp

    Filesize

    76KB

  • memory/744-1-0x0000000000660000-0x0000000000760000-memory.dmp

    Filesize

    1024KB

  • memory/744-13-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/744-14-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1544-15-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/1544-9-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/3644-54-0x00000000029D0000-0x00000000029D5000-memory.dmp

    Filesize

    20KB

  • memory/3644-47-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-18-0x0000000000620000-0x0000000000635000-memory.dmp

    Filesize

    84KB

  • memory/3644-27-0x0000000002440000-0x000000000264F000-memory.dmp

    Filesize

    2.1MB

  • memory/3644-34-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-62-0x00000000029E0000-0x00000000029E7000-memory.dmp

    Filesize

    28KB

  • memory/3644-58-0x0000000007480000-0x000000000788B000-memory.dmp

    Filesize

    4.0MB

  • memory/3644-57-0x00000000029D0000-0x00000000029D5000-memory.dmp

    Filesize

    20KB

  • memory/3644-11-0x0000000000620000-0x0000000000635000-memory.dmp

    Filesize

    84KB

  • memory/3644-53-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-52-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-51-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-50-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-49-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-48-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-17-0x0000000000620000-0x0000000000635000-memory.dmp

    Filesize

    84KB

  • memory/3644-46-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-45-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-44-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-43-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-42-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-41-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-40-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-39-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-38-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-37-0x00000000019F0000-0x0000000001A00000-memory.dmp

    Filesize

    64KB

  • memory/3644-31-0x00000000019E0000-0x00000000019E6000-memory.dmp

    Filesize

    24KB

  • memory/3644-61-0x0000000007480000-0x000000000788B000-memory.dmp

    Filesize

    4.0MB

  • memory/3644-30-0x0000000002440000-0x000000000264F000-memory.dmp

    Filesize

    2.1MB