Obrázok 1: Počet nových vzoriek škodlivého softvéru od roku 2007

V druhej polovici roku 2017 bolo v priemere objavených 795 nových malware vzoriek za hodinu, t. J. 13 za minútu. Priemer za celý rok 2017 je o niečo vyšší: 959 za hodinu a 16 za minútu. Historické porovnanie s rokom 2007 ukazuje, že v roku 2017 sa objaví viac ako 63-krát viac malware. Aj napriek tomu, že čísla druhej polovice roku 2017 nezískali nové záznamy, stále očakávame, že množstvo nového škodlivého softvéru bude naďalej stúpať.

The bigger part of malware types are with 82.7% covered by Trojans. Their ratio stepped down 6.1%. A stronger second place is achieved by Adware (13.0%) and Potentially Unwanted Programs (PUP, 3.3%). Their share grew by 6%. These are followed by backdoors, worms, an ransomware. While ransomware was hardly measurable (<0.1%) in the first half 2017, their number increased six-fold to a share of 0.2% in the 2nd half. This might not sound overwhelmingly high. But ransomware families are the most productive in the second half of 2017.

Prevented attacks in H2 2017

The number of new malware specimen tells little about the number of executed attacks. A single malware can attack thousands or even millions of computers. But most of the attacks are part of small campaigns often in far away countries. The counting is based on notifications about incidents, that we receive from users of our product, if the participate in G DATA's Malware Information Initiative (briefly MII). We are counting each file that our scanners are blocking. Since this file cannot do any harm to the system the attack is prevented. Hence we are subsequently using the term prevented attacks. 

To compare the number of prevented attacks between countries and time intervals, we have normalized the numbers. We state how many attacks were prevented per day per 1000 users. The values for the second half of 2017 vary around the arithmetic mean of 119.4. I.e. on avearge every day almost every eighth user is facing a successfully prevented attack. Throughout the second half this sums up to 22 prevented attacks in 2017's second half. The number of attacks is also fluctuating by month between 103.2 and 156.7 daily attacks per 1000 users (c.f. Figure 2 below).

Malware categories

We distinguish two kinds of attacks: Malware and Potentionally Unwanted Programs (briefly PUP). Malware is executing malicious or fraudulent activities on a computer in an unauthorized way and mostly unnoticed by the user. For PUP the line is not so clear. There are tools and applications, that allow e.g. system adminstrators to manage computers and networks. In unauthorized hands these tools can be (ab)used to do harm. In many cases it is also about advertising programs and toolbars. Their questionable use might be legalized by displaying license agreements. In most cases a user is duped.

The bigger proportion of attacks in H2 2017 is accounted for by PUP (67.6%). For malware remain 32.4%. During the fourth quarter the ratio of PUP climbs up to 73.5% and the malware's drops down to 26.5%. Simply put, the ratio of PUP and malware for the second half is 2:1 rises to 3:1 for Q4. Due to this imbalance of PUP and malware, PUP is covering the majority of the Top 10 for all incidents. The subsequent differentiation between Malware and PUP allows to look into the groups separately and reveal their individual characteristics. We provide the top 10 specimen for each category together with their percantage and a short description.
 

About malware

Table 1: Top 10 malware specimen of prevented attacks in 2nd half of 2017

The Top10 for malware contains several scripts. Most of them are working in the context of websites. The leading malware Poweliks and the related exploits are working without accessing the filesystem. Poweliks relies on Powershell scripts, that may be safed in registry entries. It was the leader in H1 2017 and still quite strong throughout the third quarter (1st place), but dropped down to place 12 in Q4. Besides the typical downloaders (as their name suggests they download and execute files from the internet) and worms, we find on place 7 - 9 malware that is used in scam campaigns involving support hotlines. There are numerous reports about alleged Microsoft security staff (mostly from India). The websites that are covered by these malware specimen are pretending that the visiting computer is infected or badly configured - very much like former Fake AV scams. But in this case the user is asked to call a support hotline. The scammers on the other end of the line talk their victims into  allowing remote access to the computer and install dubious software. They are well trained to play down notifications of AV software as false alarms. You should trust your AV's judgement in this case.

Currently, the most striking and serious threat for computers is still ransomware. We learned that they belong to the most productive malware specimen. With places 30, 163, and 194 in the Malware Top 250, they play a minor role concering the number of related attacks.

About PUP

Table 2: Top 10 of Potentially Unwanted Programs for the second half of 2017

The Top 10 is dominated by typical occurances of advertisers and software-bundlers. In Q3 2017 a newcomer entered the Top 10: "Application.BitCoinMiner.SX" on rank 10. During Q4 its prevalence grew constantly and made it to the first position. Moreover it is accompanied by a similar variant on place 3. This shows that throughout the last quarter of 2017 a new kind of abuse has been established: CoinMining. When either visiting a website or when installing a bundled file, the malware is abusing the machines computing power to make money by mining crypto currencies. The most widely spread service is Coinhive, which is mining Moneros. The increased energy cost has to be paid by the victim, while the provider of this "service" is taking the money for the coins. We will look deeper into this topic shortly.

What a colorful world

There is substantial variation of the type and the number of prevented attacks in different countries. We measured most of the daily incidents per 1000 users in Israel, Norway, and Mexico. Table 3 below summarizes the countries with the highest rates of incidents for the different types of malware. The scenario differs widely. While in France PUP and Malware are on a similar level (places 5 and 6 respectively), many countries show some variation. Germany is on place 27 for both "All Attacks" and "Malware", whereas PUP is settled on place 19. Switzerland is more into trouble with Malware (place 10) as with PUP (place 23). Israel is seeing many PUP attacks, while Norway is more affected by Malware.

At last

The look at the most productive malware specimen and the number of prevented attacks reveal the business fields, methods, and structures of the cybercrime economy - at least the part that is related to a wider audience. Much money is made in the advertising environment. The new area CoinMining is trending. The case of tech support scams shows that cyber criminals are no longer concentrated on the immediate infection of a system. They rather "convince" people to call a hotline, where the fraudulent work is accomplished. The ransomware business is slowing down, but it is still actively moving. We also see malware that is related to establish and maintain botnets as a core infrastructure, send spam mails, or run denial-of-service attacks. Every country has its own conditions.

Most of the malware specimen are executable files for Windows. Many attacks though, are carried out with scripts or macros in websites, PDFs, and documents. You should be cautious when opening unknown files or websites, and run a good Anti-Virus solution that protects you from current threats.