Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-09-2024 23:43

General

  • Target

    05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe

  • Size

    213KB

  • MD5

    0556ab04b1d32de6dd710e9ce41c5144

  • SHA1

    511605433251c6d4608c3573e6dbe7da539dc25c

  • SHA256

    05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824

  • SHA512

    dc0899c1c49cac93fc29c3bf73aa2f34e23d6a972cf95a6ace710b59a4cbcab005d44643d42421dd47132b70984ddcaf1ea20cc502469b109aad361bda8c63b2

  • SSDEEP

    3072:+ASCGfSRnbJBJ1zduUJ8lmGl6Ag9ailfqy5bQ:CfSRnbJBJdUC84Guyw

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.

  • 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\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe
    "C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4116
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\duyyqilc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2892
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kaaxjvlj.exe" C:\Windows\SysWOW64\duyyqilc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2776
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create duyyqilc binPath= "C:\Windows\SysWOW64\duyyqilc\kaaxjvlj.exe /d\"C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1716
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description duyyqilc "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3568
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start duyyqilc
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1572
    • 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:1500
  • C:\Windows\SysWOW64\duyyqilc\kaaxjvlj.exe
    C:\Windows\SysWOW64\duyyqilc\kaaxjvlj.exe /d"C:\Users\Admin\AppData\Local\Temp\05fac6984dbadd223241df331d9c564e5a23bfa500c58d5fc31c69091c23a824.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4932
    • 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:3852

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.9MB

    MD5

    a0a667b032fe5894cf4a52e180337343

    SHA1

    f442dc82c4bb31b9e680411c0ae7c6129935a34c

    SHA256

    bf797ede13d05d002316bf23f96def7c0d55566524d65cd43d92ac0a0b103c8c

    SHA512

    1b789fae855392ed0edfa7a958109a323ad0125e9842095bb59121023fba16af668e2bcb15c44ac7880c39bc043912cbd1b48878d36f3d36a3d5ebb4cf56c73d

  • memory/3852-45-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-28-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-25-0x0000000002180000-0x0000000002186000-memory.dmp

    Filesize

    24KB

  • memory/3852-47-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-33-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-55-0x0000000007900000-0x0000000007D0B000-memory.dmp

    Filesize

    4.0MB

  • memory/3852-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/3852-31-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-32-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-14-0x0000000000CD0000-0x0000000000CE5000-memory.dmp

    Filesize

    84KB

  • memory/3852-16-0x0000000000CD0000-0x0000000000CE5000-memory.dmp

    Filesize

    84KB

  • memory/3852-34-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-19-0x0000000000CD0000-0x0000000000CE5000-memory.dmp

    Filesize

    84KB

  • memory/3852-44-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-52-0x0000000007900000-0x0000000007D0B000-memory.dmp

    Filesize

    4.0MB

  • memory/3852-56-0x00000000021F0000-0x00000000021F7000-memory.dmp

    Filesize

    28KB

  • memory/3852-51-0x00000000021E0000-0x00000000021E5000-memory.dmp

    Filesize

    20KB

  • memory/3852-48-0x00000000021E0000-0x00000000021E5000-memory.dmp

    Filesize

    20KB

  • memory/3852-22-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/3852-35-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-46-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-43-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-42-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-41-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-40-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-39-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-38-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-37-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/3852-36-0x0000000002190000-0x00000000021A0000-memory.dmp

    Filesize

    64KB

  • memory/4116-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4116-1-0x00000000004C0000-0x00000000005C0000-memory.dmp

    Filesize

    1024KB

  • memory/4116-7-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4116-8-0x0000000002180000-0x0000000002193000-memory.dmp

    Filesize

    76KB

  • memory/4116-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4116-2-0x0000000002180000-0x0000000002193000-memory.dmp

    Filesize

    76KB

  • memory/4932-18-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4932-13-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4932-11-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4932-12-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB