Cyber Threat Shifts from Spam to Malware
There may finally be some good news in the war against spam. The overall percentage of spam among e-mail messages dropped an amazing 49.7 percent last month, the lowest level since 2003. This is the first time the figure has been below 50 percent in more than a decade, according to a new study by Symantec.
Symantec reported these figures in its “Symantec Intelligence Report” for the month of June. Enterprises in the mining sector had the highest spam rate, at 56.1 percent, according to the report. The manufacturing sector was a close second at 53.7 percent. The finance, real estate, and insurance sectors had the lowest of any industry, at 51.9 percent.
It is apparent that spammers treat all businesses the same with regard to size. On average, companies experienced a spam rate of between 52 percent and 53 percent no matter the number of employees. The only variance to this pattern was companies with 251-500 employees, which experienced a 53.2 percent spam rate.
Spam Appears on the Decrease While Malware Increases
Despite the good news with spam, there were several troubling observations I found in Symantec report. There was a grand total of 57.6 million new malware variants reported in June, up from 44.5 million created in May and 29.2 million in April. The increase in malware variants indicate, something that many of us already knew. Hackers are changing tactics and shift to the very dangerous cybercrime tool of malware, as opposed to spam and phishing,
In addition to the increase in malware variants, ransomware attacks were up in June, with over 477,000 detected during the month. While still below the levels seen at the end of 2014, June represented the second month in a row that ransomware attacks increased since reaching a 12-month low in April. Crypto-ransomware was also up in June, reaching the highest levels since December.
On social media, meanwhile, hackers continued to rely primarily on manual sharing attacks, which require victims to propagate the scam by sharing content themselves.