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Analysis

  • max time kernel
    148s
  • 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
    27/01/2025, 18:46

General

  • Target

    0a00671012b4cc6d328abe79ae061427f25595a5996d78dba6522d13abb23647.exe

  • Size

    10.7MB

  • MD5

    27d42e4a1a5137d5a8171fa0998feff6

  • SHA1

    c286cbcc0c3840a5c086016a9f432acdb2466bf5

  • SHA256

    0a00671012b4cc6d328abe79ae061427f25595a5996d78dba6522d13abb23647

  • SHA512

    2df5b37a8d89a632b780c2e01c0407216b66e2c9495b55d5fb7f984d6eaad409d2a1cc1f6c25f4c26b7e0c13cc89731d0f7baef1f781da642e31cea358c422db

  • SSDEEP

    3072:WcSKLbut7BWLMcD/FHNKZuKqtyONJvq4H6gGIvuFHrHtIxJXA4/a9t/a9t/a9t/6:gKHOWwe/RNKkK0vNdq4HZG0Wr2u

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
  • 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.

  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0a00671012b4cc6d328abe79ae061427f25595a5996d78dba6522d13abb23647.exe
    "C:\Users\Admin\AppData\Local\Temp\0a00671012b4cc6d328abe79ae061427f25595a5996d78dba6522d13abb23647.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1116
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kzkcasdy\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1384
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ehalluvv.exe" C:\Windows\SysWOW64\kzkcasdy\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5080
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kzkcasdy binPath= "C:\Windows\SysWOW64\kzkcasdy\ehalluvv.exe /d\"C:\Users\Admin\AppData\Local\Temp\0a00671012b4cc6d328abe79ae061427f25595a5996d78dba6522d13abb23647.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4240
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kzkcasdy "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2140
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kzkcasdy
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1956
    • 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:1996
  • C:\Windows\SysWOW64\kzkcasdy\ehalluvv.exe
    C:\Windows\SysWOW64\kzkcasdy\ehalluvv.exe /d"C:\Users\Admin\AppData\Local\Temp\0a00671012b4cc6d328abe79ae061427f25595a5996d78dba6522d13abb23647.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3300
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:2968

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.1MB

    MD5

    8469d73bb982fc46ebb8090ddd1cb20a

    SHA1

    81e94ec2c9dd4d3eb46fa2627d3dae8454ac2f4b

    SHA256

    d598bb11a33476a7fb5f74e218bcc34ae7976ba49afc16c7c1959df306558dfa

    SHA512

    a9fb5849b1d2595cfc53485e3b4071a63100077ad908233579c88f307c069bd0cb5c80bc0e4d8e18ccc6055d072cc599e46c7cade008bc13e3bce137e30df955

  • memory/1116-1-0x0000000002620000-0x0000000002720000-memory.dmp

    Filesize

    1024KB

  • memory/1116-2-0x0000000002540000-0x0000000002553000-memory.dmp

    Filesize

    76KB

  • memory/1116-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1116-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/1116-8-0x0000000002540000-0x0000000002553000-memory.dmp

    Filesize

    76KB

  • memory/1116-7-0x0000000000400000-0x0000000002284000-memory.dmp

    Filesize

    30.5MB

  • memory/2968-11-0x0000000000B80000-0x0000000000B95000-memory.dmp

    Filesize

    84KB

  • memory/2968-14-0x0000000000B80000-0x0000000000B95000-memory.dmp

    Filesize

    84KB

  • memory/2968-15-0x0000000000B80000-0x0000000000B95000-memory.dmp

    Filesize

    84KB

  • memory/3300-12-0x0000000000400000-0x0000000002284000-memory.dmp

    Filesize

    30.5MB