Sophos, a global leader in network and endpoint security has released new SophosLabs research that indicates a growing trend among cybercriminals to target and even filter out specific countries when designing ransomware and other malicious cyber attacks.

The research gathers information from millions of endpoints worldwide and is analysed by SophosLabs, a global team of internet security experts who track threats 24/7.

To lure more victims with their attacks, cyber criminals are now crafting customised spam to carry threats using regional vernacular, brands and payment methods for better cultural compatibility.

Ransomware cleverly disguised as authentic email notifications, complete with counterfeit local logos, is more believable, highly clickable and therefore more financially rewarding to the criminal.

To be as effective as possible, these scam emails now impersonate local postal companies, tax and law enforcement agencies and utility firms, including phony shipping notices, refunds, speeding tickets and electricity bills. SophosLabs has seen a rise in spam where the grammar is more often properly written and perfectly punctuated.

“You have to look harder to spot fake emails from real ones,” said Chester Wisniewski, senior security advisor at Sophos. “Being aware of the tactics used in your region is becoming an important aspect of security.”

Researchers also saw historic trends of different ransomware strains that targeted specific locations. Versions of CryptoWall predominantly hit victims in the U.S., U.K., Canada, Australia, Germany and France, TorrentLocker attacked primarily the U.K., Italy, Australia and Spain and TeslaCrypt honed in on the U.K., U.S., Canada, Singapore, and Thailand.

The analysis also shows Threat Exposure Rates (TER) for countries during the first three months of 2016. Although Western economies are more highly targeted, they typically have a lower TER.

Nations ranked with the lowest TER include France at 5.2%, Canada at 4.6%, Australia at 4.1%, the U.S. at 3%, and the U.K. at 2.8%.

Nations with the highest percentage of endpoints exposed to a malware attack include Algeria (30.7%), Bolivia (20.3%), Pakistan (19.9%), China (18.5%) and India (16.9%).

“Even money laundering is localised to be more lucrative. Credit card processing can be risky for criminals, so they started using anonymous Internet payment methods to extort money from ransomware victims,” said Wisniewski. “We have seen cybercriminals using local online cash-equivalent cards and purchasing locations, such as prepaid Green Dot MoneyPak cards from Walgreens in the U.S. and Ukash, which is now Paysafecard, from various retail outlets in the U.K.”

The concept of filtering out specific countries has also emerged as a trend.

“Cybercriminals are programming attacks to avoid certain countries or keyboards with a particular language,” said Wisniewski. “This could be happening for many reasons. Maybe the crooks don’t want attacks anywhere near their launch point to better avoid detection. It could be national pride or perhaps there’s a conspiratorial undertone to create suspicion about a country by omitting it from an attack.”

Banking is an example of how cybercriminals are using location-based malware to be more prosperous. Sophos research reveals historically how Trojans and malware used to infiltrate banks, and financial institutions converge on specific regions:

• Brazilian banker Trojans and variants pinpoint Brazil
• Dridex is predominant in the U.S. and Germany
• Trustezeb is most prevalent in German speaking counties
• Yebot is popular in Hong Kong and Japan
• Zbot is wider spread, but mostly in the U.S., U.K., Canada, Germany, Australia, Italy, Spain and Japan

“There is an entire cottage industry of uniquely-crafted Trojans just targeting banks in Brazil,” said Wisniewski.

With cybercriminals having a deliberate hand in creating threats that look authentic and are specifically targeted, it is more difficult to recognise malicious spam. Home computer users are often a target of these attacks and should protect their systems from sophisticated malware threats.