Trocando (Hackeando) as senhas no Windows XP.
Posted on janeiro 12, 2010
Filed Under Dicas, Microsoft, Redes, Seguraça, Sistema Operacionais, Software, Windows XP | Leave a Comment
O truque é facilmente aplicado: substituir o arquivo que é chamado pelo atalho das opções de acessibilidade por outro executável qualquer. O mais prático é o “cmd.exe”, o interpretador de comandos. Basta acessar a pasta system32, renomear (ou apagar) o arquivo “sethc.exe”, e então copiar o “cmd.exe” para essa mesma pasta, renomeando a cópia com o nome “sethc.exe”. Só isso. Agora, ao segurar SHIFT por 8 segundos, o prompt de comando será aberto. Na tela de logon, como os direitos da conta usada ali são de administrador, o prompt de comando será executado como administrador.
Nota: na tela de logon que lista os usuários, o prompt de comando (ou o arquivo “sethc.exe”, mais precisamente) poderá ficar oculto, por trás dela. Para não se atrapalhar e exibi-lo corretamente, alterne para o logon clássico, teclando duas vezes CTRL + ALT + DEL. (No Windows NT, teclar duas vezes CTRL + ALT + DEL não faz com que o sistema seja reiniciado; se você não acompanhou o Windows 2000/XP e só conhece o 9x/Me, é bom saber disso
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O arquivo pode ser substituído facilmente se o usuário possuir uma conta local, mesmo que restrita, e se o HD estiver formatado em FAT/FAT32. Usando o próprio Explorer pode-se trocar o arquivo, já que ele não fica aberto o tempo todo. Se o HD estiver formatado em NTFS, onde os usuários limitados não têm permissão de escrita nas pastas de sistema do Windows, e/ou se o usuário for um intruso que não possui sequer conta local, basta usar um sistema alternativo, que rode do CD. O mais comum é o Linux, diversas distros, como o Kurumin
Isso considerando que o sistema possa ler e escrever em NTFS, o que é o caso do Kurumin 7.
Rodando o prompt de comando como administrador, você pode chamar programas, que serão executados com privilégios de administrador. Rode “control userpasswords2” para criar novos usuários ou redefinir a senha de qualquer conta de usuário, incluindo, é claro, do administrador.
Se preferir, use o console de gerenciamento do computador (compmgmt.msc), e clique em “Usuários e grupos locais”. Eu me surpreendi, pois foi possível rodar até o Explorer!
Google faz novo protocolo por web mais veloz
Posted on novembro 21, 2009
Filed Under Internet, Noticias, Programação, Redes, Software, Tecnologia | Leave a Comment
Segure firme seu mouse: o Google quer uma web duas vezes mais rápida.
E para tornar isso possível, a companhia anunciou, sem alarde, que está desenvolvendo um novo protocolo chamado de SPDY (pronuncia-se SPeeDY).
A nova plataforma, segundo o blog de pesquisas do Google, já vem sendo estudada há alguns meses e será usada dentro do próprio HTTP, comprimindo seu cabeçalho.
Ela também incorporará um novo sistema de fluxos múltiplos, bem como uma inovadora priorização de pedidos de tarefas. Tudo para aumentar a velocidade e diminuir o que chamam de “latência”.
De acordo com as palavras de Mike Belshe e Roberto Peon, dois engenheiros de software do Google, os testes com o novo recurso foram realizados apenas em laboratório, com um protótipo de servidor web e cliente de Google Chrome com suporte SPDY.
Nesta fase inicial, dizem, os resultados foram animadores: as 25 páginas mais vistas da web recarregaram 55% mais rápido quando os engenheiros fizeram downloads a partir de uma simulação de conexão caseira.
Apesar do resultado positivo, o Google explica que “há muito trabalho a ser feito” e não dá expectativas de data de lançamento.
Como tradição da empresa, os Googlers convidam desenvolvedores e demais interessados para contribuir com o projeto, enviando links para documentação, código e grupo de discussão.
Uninstall Office Genuine Advantage Notifications Notifier (KB949810) with OGA Uninstaller
Posted on outubro 30, 2009
Filed Under Microsoft, Software | Leave a Comment
Office Genuine Advantage (OGA) is another initiative by Microsoft to stem the piracy and counterfeit copy of Microsoft Office business producitivity suite and applications. Since April 15, 2008,Office Genuine Advantage (OGA) Notifications was pushed to clientcomputers installed with Microsoft Office XP, Office 2003 or Office 2007 as “Important” or “Needed” update, and is not removable or uninstallable after installed.
After installed, OGA validation component will perform a check on install Office software, and OGA Notifications notifier component will display various “This copy of Microsoft Office is not genuine” message if the Office software is determined as not genuine or not legitimate.
Although officially Microsoft prevents and disallows end-users from removing OGA Notifications (KB949810), there are several workarounds or hacks to remove Office Genuine Advantage Notifications. In fact, as it’s a MSI (Windows Installer) package which installed the OGA, the KB949810 OGA update can be removed and completely uninstalled properly and completely by using MSI uninstall string.
How to Uninstall Office Genuine Advantage Notifications (KB949810)
- Open an command prompt window with elevated privileges.
- Depending on the version of OGA (Office Genuine Advantage) installed (can be view from properties of %SystemDrive%\Windows\System32\OGAAddin.dll or DEL %SystemDrive%\Windows\System32\OGACheckControl.dll), run following commands below (see Tip below if you only want to run one command):
MsiExec /X {049F2E8F-D5EC-4133-87FA-8E94837D8D0C} /QN /NORESTART ALLUSERS=1
MsiExec /X {B148AB4B-C8FA-474B-B981-F2943C5B5BCD} /QN /NORESTART ALLUSERS=1
MsiExec /X {DB427EF6-F13E-4AA6-9D40-5D962394774F} /QN /NORESTART ALLUSERS=1
MsiExec /X {B2544A03-10D0-4E5E-BA69-0362FFC20D18} /QN /NORESTART ALLUSERS=1Note that the GUID identifier for OGA application may vary from systemto system, depending on version and language installed. Generally, it works for OGA v1.7.0102.0, OGA v1.7.0105.35.0 and OGA v1.7.0105.35.0 v2.0.48.0.
Tip: To determine which is the exact application ID for Office Genuine Advantage installed on your system, run Registry Editor (RegEdit), and navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurentVersion\Uninstall
There are many registry sub-keys that resembles the product ID above. Go into each and everyone of the registry sub-branches to look for and locate DisplayName REG_SZ value data which matches or similar toOffice Genuine Advantage or OGA.
- After uninstalling OGA properly, it’s wise to clean up and remove all trace of OGA from the system. Run the following commands to delete all registry entries and system files, if still present:
REG DELETE HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Word\Addins\OGAAddin.Connect /f
REG DELETE HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Excel\Addins\OGAAddin.Connect /f
REG DELETE HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Powerpoint\Addins\OGAAddin.Connect /f
REG DELETE HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\OGAAddin.Connect /f
DEL %SystemDrive%\Windows\System32\OGAVerify.exe
DEL %SystemDrive%\Windows\System32\OGAEXEC.exe
DEL %SystemDrive%\Windows\System32\OGAAddin.dll
DEL %SystemDrive%\Windows\System32\OGACheckControl.dll
User who want an automated solution to remove Office Genuine Advantage can download the OGA Uninstaller, a batch script that automatically run all of above commands.
Download OGA Uninstaller: RemoveOGA.bat
Instalando o Chromium no Fedora
Posted on outubro 30, 2009
Filed Under Internet, Linux, Software, dicas | Leave a Comment
Para quem não sabe, o Google Chrome é um navegador de código-fonte aberto desenvolvido pelo Google que usa o motor WebKit para renderizar as páginas. O nome é derivado a partir da interface gráfica da moldura, ou “cromo”, de navegadores web. A primeira versão, beta, para o Microsoft Windows foi lançada em 2 de setembro de 2008 em 43 idiomas, hoje está disponível em 50. Para Mac OS X e Linux, as versões ainda estão em desenvolvimento, com previsão de lançamento para 2009 ( Fonte: http://pt.wikipedia.org/wiki/Google_Chrome ).
Como sou usuário do Fedora, e não vi nenhum lançamento oficial do mesmo, isto acabou me deixando curioso para descobrir se havia alguma solução para instalação do mesmo nativamente no Fedora.
Para instalar o mesmo é só criar um repositório de nome chromium.repo dentro do diretório /etc/yum.repos.d :
# vim /etc/yum.repos.d/chromium.repo
Digite o seguinte conteúdo dentro deste diretório:
[chromium]
name=Chromium Test Packages
baseurl=http://spot.fedorapeople.org/chromium/F$releasever/
enabled=1
gpgcheck=0
Salve o arquivo e depois, é só digitar o comando :
# yum install chromium -y
E pronto, você está com o Chromium instalado no seu Fedora.
Which Windows 7 is right for you?
Posted on outubro 22, 2009
Filed Under Microsoft, Sistema Operacionais, Software, Tecnologia Pessoal, Windows 7 | Leave a Comment
Windows 7 officially will be released to the public on Thursday, and judging by our poll, most CNET readers have already decided to upgrade. For those who haven’t, or for those who want a bit more information on just what you’re getting with your Windows 7 Starter, Home Premium, Professional, or Ultimate, take a look at the chart and explanation below.
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This CNET-produced chart is based on a larger one from Wikipedia.
Windows 7 Starter is the lightweight version of the new operating system that only comes with Netbooks. It’s not available for upgrade from Windows XP or Windows Vista, and it’s fairly hamstrung. Sixty-four-bit isn’t available, and the Backup and Restore Center won’t work with network-based drives. It also lacks many of the key features that make Windows 7 appealing. Aero is disabled, as is the new theme manager.
Windows Media Center and Windows Media Player aren’t included, and so it shouldn’t be surprising that none of the more advanced features is baked in, either. XP Mode, which will allow Windows 7 to run XP-only programs, Remote Desktop Host, BitLocker Drive Encryption, and multitouch support are all not available in Windows 7 Starter.
So just what does Starter offer? Users can pin programs to the Taskbar, and the helpful jump lists remain active, too. Snap still functions for quickly resizing program windows, although it doesn’t have its slick Aero look. The revamped Windows Search will work, and other under-the-hood improvements–such as better Wi-Fi and device management–are also fully functional. Users can use the in-place Anytime Upgrade option to buy an upgrade from Starter to Home Premium.
Windosw 7 Home Premium is the basic version that should appeal to most casual users, and retails for $119. Most of the big features that Microsoft wants you to know about are included here. Aero Peek for previewing programs and clearing the desktop, Aero Snap for resizing program windows, and the Aero skin with its translucent Taskbar and window borders are all in full effect. Aero Shake is also enabled, which is a quick way to clear the desktop by clicking and holding down on one program window and lightly shaking, hiding all the other open windows.
Theme switching and customization is activated, and the Windows Media Center and Windows Media Player will allow users to stream video directly to their desktops. Multitouch features are enabled, and Home Premium can be used to create a Home Group, which simplifies sharing music, video, and other files between computers that are all members of the same group. It’s also available in 64-bit, but can only support up to 16GB of physical RAM. Home Premium can be upgraded using the Anytime Upgrade to either Professional or Ultimate.
Aero Peek is only available in Windows 7 Home Premium and above.
(Credit: Screenshot by Seth Rosenblatt/CNET)
Although it sounds full-featured, Home Premium definitely offers less than Windows 7 Pro or Windows 7 Ultimate. Location-aware printing, presentation mode, and XP Mode are not available. Neither is BitLocker, AppLocker, the remote desktop host feature, nor Aero glass via remote. AppLocker is the new feature that allows system administrators to restrict program access from the Group Policy settings. You also can’t use the Windows 7 Backup and Restore feature to work with network drives, just like Windows 7 Starter. That feature doesn’t come in until the Pro version.
Windosw 7 Professional is the power user edition of the new operating system, retailing for $199.99. In addition to all the features in the Home Premium edition, Pro is designed to be flexible for dual use in the home and small business. It will support up to 192GB of physical RAM in 64-bit mode, it supports legacy Windows XP productivity programs via XP Mode, it can work with two physical processors, and it can back up your data to a networked drive. It still lacks the AppLocker and BitLocker features, it can’t handle the pretty but superfluous remote Aero glass support, and it lacks the multilingual interface support pack.
Windows 7 Ultimate, retailing for $219.99, supports those features plus virtual hard-disk booting and a subsystem for Unix applications. Although it’s possible to conceive of some home uses for Ultimate, the features that separate it from Windows 7 Pro set it in a class that’s almost exclusively for intensive international or network use. For most office or home power users, it’s not really recommended.
There are several other versions of Windows 7 available. Windows 7 Home Basic is for emerging markets such as Bangladesh, China, India, and Mexico, and places itself between the Starter edition and the Home Premium edition in terms of features. Aero is partially enabled, for example. Windows 7 Enterprise is identical to the Ultimate edition, but is only available via volume licensing. The Europe-only “E” version was going to come without Internet Explorer, but that has changed to the “N” version that lacks the media player.



