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Category: Flash

Mar 01 2013

Apple blacklists older versions of Flash plugin due to security risk

Just as it did with some versions of Java, Apple has now blocked older versions of Adobe's Flash plugin to protect Mac users from security risks. In a new support document posted to its website on Friday, Apple explained that it has already updated its plugin blocking tool built into Safari—users don't need to lift a finger.

"To help protect users from a recent vulnerability, Apple has updated the web plug-in-blocking mechanism to disable older versions of the web plug-in: Adobe Flash Player," the company wrote.

Earlier this year, Apple blacklisted the latest version of Java—twice—due to security vulnerabilities. But Flash comes with its own security risks: Adobe issued an emergency Flash update earlier this month due to similar vulnerabilities on OS X and Windows, with another emergency update issued again three days ago. Like the Java holes, the Flash vulnerabilities allow remote attackers to surreptitiously install malware on vulnerable machines.

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categories Flash, Infinite Loop, Java, Naked Security, plug-in, Risk Assessment, Safari, Security | | comments Comments (0)

Jun 07 2012

‘Bioskits’ Join Ranks of Stealth Malware

We have seen many discussions of the MyBios “Bioskit” discovered at the end of 2011. MyBios was the first malware to successfully infect the Award BIOS and survive the reboot. It was first discovered by a Chinese security company; many other security vendors published detailed analyses after that.

We have seen a lot of samples targeting the master boot record (MBR) to survive a reboot and reinfect a system. We found a sample in our collection that infected the MBR. Further investigation showed that the next variant of the malware was a Bioskit. The first variant of the malware was an executable that infected the MBR; the second was a DLL with the Bioskit component. We will discuss the second variant in this blog.

DLL Analysis

The malware’s main dropper is a DLL that is responsible for the MBR infection. It reads the original MBR from Sector 0 and writes it to Sector 15.

MyBios code writes the malicious MBR.

The malware overwrites the original MBR in sector 0 and writes the file to be dropped (the downloader) in hidden sectors. The DLL copies itself to the Recycle folder and deletes itself. The downloader is dropped and executed every time the system is started.

The malicious MBR

The next two screens show the malicious MBR code, which reads the original MBR from Sector 15 into memory at location 0000:7c00. Control passes to the original MBR at this location and the system boots in the normal way.

Usually the boot sector is read to this memory location in a clean system after the power-on self-test and INT 19 jumps to location 0000:7c00.

The malicious MBR at 7c00 before the interrupt

The original MBR at 7c00 after the interrupt

All the components dropped will be present in the DLL, including the utility cbrom.exe from the BIOS manufacturer, which the malware uses to flash the BIOS.

 

Dropped System File

The sys file responsible for flashing the BIOS is similar to the one seen in MyBios. Unlike bios.sys, the code to check the BIOS manufacturer and the BIOS size is present in the DriverEntry. However, the functionality of both the drivers remains the same.

Code to check for Award BIOS

The rest of the code responsible for backing up and flashing the BIOS is present in the driver dispatch. A graph showing the code flow of both MyBios and the Niwa rootkit can be seen below.

MyBios code flow

NIWA code flow

What’s interesting is that the strings observed in both malware are almost identical.

MyBios:
This is not an Aword BIOS!

NIWA:
This not an Aword BIOS!

Identical strings:
Flash Aword BIOS form disk c bios.bin success.
SMI_AutoErase Aword Bios Failed.
ExAllocatePool read file NonPagedPool failed.
Backup Aword BIOS to disk c bios.bin success.
MmMapIoSpace physics address:0x%x failed.

It cannot be a coincidence that almost all of the strings are identical (including misspellings and bad grammar). This suggests the same individual or group is behind both of these BIOS-flashing malware.

McAfee detection and cleaning

McAfee detects this infection as “Niwa!mem” and successfully cleans the MBR infection and deletes all other malicious dropped components.

Conclusion

We have now seen two Bioskit malware in the wild within a couple of months. When the first Bioskit was identified, we did not know how soon we would see another. Now it appears we should expect to see more in near future. It’s not hard to detect and clean the MBR, but cleaning BIOS infections will be a challenge for security vendors.

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categories award, Bios, Bioskit, bootkit, Flash, master boot record, MBR, McAfee Labs, Mybios, Naked Security, Niwa, reinfect mbr, rootkit, Security, survive reboot, windows malware | | comments Comments (0)

Feb 07 2012

At Last – Adobe Launches Sandboxed Flash Player For Firefox

Finally a proactive measure from Adobe to try and remedy the horrible security flaws they have introduced to Firefox with their Flash Player. There have been some massive hacks recently due to Flash - - Hackers Exploiting Latest Adobe Flash Bug On Large Scale - Adobe Patches Latest Flash Zero Day Vulnerability - Adobe Promises [...]

Read the full post at darknet.org.uk


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categories adobe flash player, adobe flash security, Countermeasures, Firefox, firefox-security, Flash, flash exploit, flash exploits, flash player security, flash sandbox, flash security, flash vulnerabilities, hacking-firefox, hacking-flash, Naked Security, Security, Security Software, Web Hacking | | comments Comments (0)

Oct 25 2011

Bundestrojaner, Sony breach, Duqu, OS X anti-anti-virus, MS hack – 60 Sec Security

Enjoy the latest security news in brief by watching 60 Second Security!

This episode: the German Bundestrojaner controversy, Sony breached (again!), Duqu dubbed “Son of Stuxnet”, OS X anti-anti-virus and Microsoft videos hacked.

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categories anti-anti-virus, breach, Bundestrojaner, ccc, chaos computer club, Duqu, Flash, Iran, Mac OS X, Microsoft, Naked Security, OS/X, reitinger, Security, youtube hack | | comments Comments (0)

Oct 20 2011

Flash Bug Allows Miscreants to Remotely Operate Your Web Cam

Adobe Systems has announced it’s in the process of fixing a security vulnerability in Flash that would allow malicious web sites to remotely operate a user’s webcam and microphone.

The vulnerability is on Adobe’s server side, not on client-side software, and therefore does not require users to update their software.

Adobe told CNET it was hoping to have the fix done by the end of this week.

The vulnerability was discovered by Feross Aboukhadijeh, a Stanford University computer science student. Someone could use the vulnerability for a “clickjacking” attack, which involves hiding malicious code on a web page so that people who click on parts of the page would have their computers exploited. Aboukhadijeh prepared a video (above) demonstrating an attack scenario using the vulnerability.

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categories Editorial, Flash | | comments Comments (0)

Oct 19 2011

Mac malware evolves – time for Apple owners to wake up

Mac users have once again been reminded not to be complacent about the malware threat, with the discovery that cybercriminals have enhanced an existing Trojan horse to disable the rudimentary anti-virus protection Apple has built into Mac OS X.

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categories backdoor, Flash, Mac OS X, Naked Security, OSX/FlshPlyr-A, Security, xprotect | | comments Comments (0)