In principio era Windows, ora tocca al MacOSX. Non era mai successo, nella storia di Apple, che il sistema operativo MacOsX fosse attaccato così in larga scala (in Italia è stimato lo 0,3%, 57% in USA e 20% in Canada). I numeri dicono 600mila MacOsX infettati.
Il virus si chiama “Flashback” ed è stato scoperto da Dr. Web, azienda Russa di antivirus. Cupertino ha già rilasciato una patch per risolvere il problema.
Se volete vedere se anche il vostro Mac è stato infettato dovete aprire il terminale e digitare il seguente comando:
defaults read /Applications/Safari.app/Contents/Info LSEnvironment
Se la risposta è la seguente potete stare tranquilli:
“The domain/default pair of (/Applications/Safari.app/Contents/Info, LSEnvironment) does not exist”
Flashback si insinua nel sistema utilizzando una vulnerabilità Java dei browser internet Safari. Inizialmente il malware arrivava nei computer camuffato da estensione per Flash.
Qui di seguito viene riportata la procedura completa per risolvere il problema:
1 – Aprire il terminale e digitare “defaults read /Applications/Safari.app/Contents/Info LSEnvironment”
2 – Prendere nota dei codici DYLD_INSERT_LIBRARIES e premere nuovamente invio
3 – Se si riceve un messaggio d’errore simile a “The domain/default pair of (/Applications/Safari.app/Contents/Info, LSEnvironment) does not exist” non si è infetti.
4 – Se i file vengono effettivamente trovati, digitare “grep -a -o ‘__ldpath__[ -~]*’ %percorso_del_punto_2% ” e prendere nota del valore di fianco a “__ldpath__”
5 – Eseguire i comandi “sudo defaults delete /Applications/Safari.app/Contents/Info LSEnvironment” e “sudo chmod 644 /Applications/Safari.app/Contents/Info.plist”, cancellando poi i file trovati nel secondo punto e nel quarto.
6 – Eseguire il comando “defaults read ~/.MacOSX/environment DYLD_INSERT_LIBRARIES” e, se si riceve un messaggio come “The domain/default pair of (/Users/joe/.MacOSX/environment, DYLD_INSERT_LIBRARIES) does not exist” il trojan è stato correttamente rimosso. In caso contrario, eseguire nuovamente “grep -a -o ‘__ldpath__[ -~]*’ %percorso_del_punto 4% “, prendendo nota dei valori.
7 – Dopo aver eseguito “defaults delete ~/.MacOSX/environment DYLD_INSERT_LIBRARIES launchctl unsetenv DYLD_INSERT_LIBRARIES”, cancellare i file indicati nei punti precedenti.
Ad maiora
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