September was a very busy month for me as I wrote and presented a paper at the Virus Bulletin conference in Vienna, Austria, as well as dealing with my usual workload.
As usual on the malware related security threats front it has been an interesting month with yet more malware using social-engineering to get the victim to infect their computer without the need for the malware author to have to code routines to automate infection. We’ve also seen lots of activity from scammers and cyber-criminals again, more on that later.
Like previous months, I will cover some statistics from my own sensors and compare those against those from a couple of major anti-virus companies, and finally I will cover new and interesting things that occurred during the month.
I have created some graphs and performed some trend analysis from the raw data from my WormCharmer and Bayesian filter.
I have included four sources of information for the graphs and pie-charts, these are:
The last two are my own projects and all data is from the Internet, these systems are running on an aDSL link and are personal research projects that have been running for some time; WormCharmer 5 years, Malware Bayesian Filter 4 years.
In total I captured 457 samples during September, which have been catalogued as 27 distinct families and variants. In comparison during August I captured 566 samples which were catalogued as just 20 distinct families/variants. As you can see the captures in September are slightly down from August’s total.
During September I captured and submitted three brand new malware strains/variants [unknown to all or most AV companies at the time of submission].
As shown by September’s statistics the general trend is still downwards. It appears that social-engineering is very much the technique of choice this year.
The first pie chart below shows the Top 10 distinct malware by percentage. Let The first pie chart below shows the Top 10 distinct malware by percentage. Let us look at this in more detail:
During September I reported 49 new Phishing sites which are now included in the Netcraft phishing site database used by the Netcraft anti-phishing toolbar which I blogged about some time ago.
The first pie chart below shows the Top 10 distinct malware by percentage. Let us look at this in more detail:
W32/Tenga.3666 [Frisk] has continued to hold on to the pole position it took back in April. It now accounts for almost 76 percent of the samples captured in September, down from almost 82 percent in August.
There are eight [up from seven] members of the Opaserv.worm family in September’s chart. These are variants: AI, AE, D, AJ, E, I, AD and AH in second, third, fourth, fifth, sixth, seventh, ninth and tenth places respectively.
The final slot left is taken by our old friend Dupator who is down one place from seventh to eighth.
If you compare the above to the data from Kaspersky and also the data from SOPHOS you may see some marked differences. Why? Well, simply my sample capture systems collect data from multiple ‘vectors’ and combine the data, so I tend to get a more rounded picture of what is really running round the Internet in the way of net nasties.
As you can see the top 10 from Kaspersky [below] for September Mytob.c has once more started to slide back down the chart from fourth to sixth place.
Netsky.q [aka P] has consolidated its hold on pole position it managed to grab back in June. It is joined by three [same as in August] other family members, these being: Netsky.t, which has slipped down one place seventh to eighth spot. Netsky.aa continues its upward climb, up from third to the runner-up spot; second place. The final Netsky family member is Netsky.b which is static in tenth place.
Bagle.gt has reversed once more restarted its slow journey down the chart, falling from second to fourth place.
Like Bagle.gt, Worm.Win32.Feebs.gen is slipping down the chart once more, from fifth to seventh place.
The final free places in September’s chart are taken by one re-entry, this being Email-Worm.Win32.Nyxem.e [aka Mywife.D], a new entry Trojan-Spy.HTML.Paylap.bg in at ninth place, and finally we have Mydoom.l up from sixth to the final podium step; third.
Kaspersky had this to say about September’s chart:
“Our forecasts for September turned out not to be spot on. Trojan-Downloader.Win32.Agent.brk, which was spreading actively in August, didn’t extend the botnet that it builds, and as a result, there’s not a single Warezov variant in September’s Top Twenty.
However, the authors of another email worm, Zhelatin (aka the Storm worm) stepped up their activity. Throughout August security companies provided regular reports and estimates on the scale of the botnet created by the worm. Some estimates were as high as 2 million infected computers around the world – indicating that a new epidemic was on the horizon. However, September was remarkably calm from this point of view. Either the numbers were erroneous, or the authors of Zhelatin have decided to take a break until law enforcement agencies around the world direct their attention elsewhere.”
Please note: SOPHOS are now effectively only using family names for their top ten malware and because of this I will now use the same method for analysing their data.
In the SOPHOS chart we see a similar pattern; Netksy has further consolidated its grip on pole position.
Mytob has consolidated its grip on third place. The runner-up spot has been taken by Troj/Pushdo which climbs up from the fourth place it held in August. Last month’s runner-up spot sitter, W32/Zafi has fallen down to fourth place.
Mydoom which was a re-entry in November’s chart has once more lost ground, falling back down to seventh from fifth.
Bagle also slipped down the chart during September, from eighth to ninth place.
There are two re-entries in September’s chart, these being Mal/IFrame and Mal/Behav in fifth and sixth place respectively.
To complete the chart we have one new entry, this being Mal/Basine and the final place is occupied by TraxG static in tenth.
Here is some commentary on September from Sophos:
“The figures, compiled by Sophos’s global network of monitoring stations, have shown a rise in the percentage of infected email. Overall in September, 0.12 percent of emails were carrying malicious email attachments, or 1 in every 833, compared to 1 in every 1000 during August. This is primarily due to a coordinated campaign by hackers to spam out the Pushdo Trojan horse en masse during the second half of September. The emails, which pose as naked pictures of Hollywood actresses such as Angelina Jolie and “Holly Berry” [sic], carry a malicious payload designed to give criminal hackers control over infected PCs. During a single 24-hour period in the last week of September, Sophos reports that the Pushdo Trojan accounted for almost 4 in every 5 infected emails.”
The final pie chart below shows the Top 10 malware families trapped by percentage. As you can see this includes not only mass-mailers but also share-crawling worms and bots.
This month the table is still headed up by the September 2005 leader, Tenga. Operserv has had to settle for the runner-up spot; second, yet again and the final step of the podium, third place, is occupied by Dupator which is where it was in August’s chart.
We have five re-entries in the chart in September; these are Win32.Zhelatin, Win32.Agent, Trojan.BAT.Runner, IRC.Zapchast and Win32.Tibs back in the chart in fourth, sixth, seventh, eight and ninth place respectively. Sixth place is occupied once more by W32.Funlove.
The final place in September’s chart is occupied by Lorez down from seventh to tenth.
The more astute of you may have noticed that the top ten for September, once more contains ten entries rather than the seven we had in August.
If you wish to see the current top 10, then see my external website at http://momusings.com. The data which feeds the WormCharmer stats is updated every 3 minutes 24 hours a day.
Please feel free to ask questions if you need any clarification on the data, the setup or whatever.
Now, let’s switch to a different method: The following graph shows the percentage of malware that I received and my Bayesian Filtering tool classified correctly. You can see the data for the whole of the period of 2005 – 2007 [up to the end of September] here. This clearly shows that September was quieter than the previous two months. As shown in the figures for September, the overall trend is still downwards [as far as e-mails with malware attachments are concerned] and we will continue to see less malware being seeded via e-mail. Instead we will continue to see more malware being seeded via links in e-mails, rather than as attachments, such as fake e-cards or targeting particular interests, such as sport.
The reason for the jumps during July-September is that I adjusted my filters to classify the e-card notifications used by the ‘Storm Worm’ gang as malware, even though there are no attachments. This is due to the fact that these e-mails contain links to malware files being hosted on web servers, also the web pages they link to contain a number of exploits to try and automatically infect visitors that are not patched or otherwise protected.
The raw statistics (both CSV and Graphed) can be found in the usual place on my site. If you feel you need access then please contact me to discuss.
If we look at the overall growth of malware in 2007, it grew from 222,473 [as at the end of 2006] to 329,196 at the end of September. That’s a growth of 106,723 new malware strains and/or variants so far in 2007, in September the number once more jumped by over 12,000. If I extrapolate this my guesstimate for the growth in malware in 2007 would be just almost 142,300. Things have certainly speeded up during the second and third quarters of 2007!
What’s New?
Instead of including commentary here about things I have already written about, I will offer links to other blog entries that may be of interest, topical, or cover some of the interesting occurrences during July 2007.
Conclusions:
The current trend of using social-engineering which has been widespread in January – August has continued during September, if anything it has accelerated as can be seen by the examples covered above of the Storm Worm spam runs.
Levels of spam seen are almost back to their usual levels after the slight drop in the level of spam during August. The spammers haven’t been idle during September as they are still trying out other file formats which they hope will bypass anti-spam defences.
The Phishers have been busy both with new versions of their scams, as shown by the mass of attacks aimed at many of the UK banks during September. This is clearly shown in the massive jump in the percentage of phishing scams we’ve seen during both August and September.
Malware being seeded via e-mail is back, however as we have seen it is different than the malware that used to arrive via e-mail as an attachment. Now they just get you to download the malware and infect your own computer, works just as well and without the need for extra coding as they aim for the weakest link in the security chain; the person using the computer.
All in all, it looks like we could be in for a very interesting, and busy, last quarter of the year! Typically the last quarter of the year and specifically the run up to Christmas is the most active time of the year for all the bad guys and girls.
Links: