Vulnerabilities / Threats
4/10/2012
11:52 AM
Connect Directly
Google+
Twitter
RSS
E-Mail
50%
50%

How Malware Gets Backed Up Along With Data

Malware is widely bypassing AV and other controls, getting backed up like any legitimate data, and re-infecting enterprise systems during restore.

Anonymous: 10 Facts About The Hacktivist Group
Anonymous: 10 Facts About The Hacktivist Group
(click image for larger view and for slideshow)
When malware slips past antivirus, it can get swept up in an enterprise's system backup and ultimately reinfect systems when the company restores applications from its contaminated backup.

Oliver Friedrichs, head of Sourcefire's cloud technology group, says this cycle occurs more often than you'd think. Friedrichs recently analyzed data collected from more than 2 million Sourcefire users during a one-month period and found that backup and file restoration applications often inadvertently restore malware.

His findings: During a one-month period, DropBox, a cloud-based file-sharing and backup service, restored 17,705 threats; Maxtor Backup and Restore's MaxSynch, 5,076 threats; 2BrightSparks SynchBack backup software, 165 threats; and FreeFileSync, 104 threats. These were users that had been running traditional AV products.

"We've historically talked about backing up malware as a hypothetical ... we assume it's been happening, but there hasn't been a clear way to see how frequently it's been taking place," Friedrichs says. "This [analysis] is a confirmation and affirmation that it is happening. We should be concerned about it and aware of backing up malware and then restoring malware."

Friedrichs says this demonstrates how malware is widely bypassing AV and other controls and then getting backed up like any legitimate data or files. Once the backup is "polluted," he says, if it is used to restore a system, [the malware] would also be restored onto the system once again.

[ Sometimes it's the little things--a misconfigured network proxy or an unused and forgotten port--that can make the difference in whether an organization suffers a major hack. See Simple Settings That Could Curtail Some Attacks.]

Is this an AV or a backup problem? Gleb Budman, co-founder and CEO of cloud-based backup service provider Backblaze, says his firm had explored whether it should provide malware scanning as part of its online backup service. But it just didn't make sense, for two reasons: "We encrypt all of the files [backed up] so they can't be scanned in our data center," Budman says. "We could scan on your client AV in our backup agent on your system--we thought about that--but if a user is already running AV, they would run it, then we would run it, and we'd be using up system resources twice. That seems kind of silly."

Read the rest of this article on Dark Reading.

Most external hacks of databases occur because of flaws in Web applications that link to those databases. In this report, Protecting Databases From Web Applications, we'll discuss how security teams, database administrators, and application developers can work together to improve the defenses of both front-end Web applications and back-end databases to prevent these attacks from succeeding. (Free registration required.)

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Flash Poll
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-2329
Published: 2015-08-31
Multiple cross-site scripting (XSS) vulnerabilities in Check_MK before 1.2.2p3 and 1.2.3x before 1.2.3i5 allow remote authenticated users to inject arbitrary web script or HTML via the (1) agent string for a check_mk agent, a (2) crafted request to a monitored host, which is not properly handled by ...

CVE-2014-2330
Published: 2015-08-31
Multiple cross-site request forgery (CSRF) vulnerabilities in the Multisite GUI in Check_MK before 1.2.5i2 allow remote attackers to hijack the authentication of users for requests that (1) upload arbitrary snapshots, (2) delete arbitrary files, or possibly have other unspecified impact via unknown ...

CVE-2014-2331
Published: 2015-08-31
Check_MK 1.2.2p2, 1.2.2p3, and 1.2.3i5 allows remote authenticated users to execute arbitrary Python code via a crafted rules.mk file in a snapshot. NOTE: this can be exploited by remote attackers by leveraging CVE-2014-2330.

CVE-2014-2332
Published: 2015-08-31
Check_MK before 1.2.2p3 and 1.2.3x before 1.2.3i5 allows remote authenticated users to delete arbitrary files via a request to an unspecified link, related to "Insecure Direct Object References." NOTE: this can be exploited by remote attackers by leveraging CVE-2014-2330.

CVE-2014-2570
Published: 2015-08-31
Cross-site scripting (XSS) vulnerability in www/make_subset.php in PHP Font Lib before 0.3.1 allows remote attackers to inject arbitrary web script or HTML via the name parameter.

Dark Reading Radio
Archived Dark Reading Radio
Another Black Hat is in the books and Dark Reading was there. Join the editors as they share their top stories, biggest lessons, and best conversations from the premier security conference.