A recent MessageLabs Intelligence report from Symantec found that workers tend to visit prohibited websites with greater frequency when working from mobile devices.

Mobile workers were found to be five times more likely than office employees to trigger website blocks or attempt to download unauthorized programs. Rules regarding shopping, search engine use or visiting online dating sites are also broken more frequently by mobile workers. Surprisingly, a higher percentage of office-based workers attempt to access adult content on the company network, InformationWeek reports.

While a seemingly simple solution to this problem is to install a robust website filtering and blocking system, the survey found that 80 percent of blocked sites were legitimate but compromised.

Symantec's study also investigated the growth rate of major online threats to desktop security. Spam content actually decreased between August and September, but still represents 92 percent of all emails. New malware over that period represented 22 percent of all malware online.

According to NetworkWorld's report on the same study, the most notable finding is that mobile workers pose a greater threat than those who are based at home. Since mobile employees move freely between the office and remote locations, they tend to carry an increased threat of bringing compromised systems into a workplace that is otherwise secure.