Virus vendor Kaspersky has spotted a few families of Java executables in the wild which don’t really care what operating system you use.
By packing malware as a JAR file, crooks are practically making sure their content will be executed on all targets, regardless of operating system.
True the Java engine needs to be installed on each victim’s computer for the malware to run, but given it is installed on 70-80 percent of computers that is pretty much a no-brainer.
According to Kaspersky, Brazil’s criminal underground seems to be the first one that has taken this step. At the moment they are running spam campaigns and banking trojans.
Right now, infections with these three malware families that use JAR files are popping up mainly in Brazil, but a large number of victims was also recorded in China and Germany, where Kaspersky says that local cyber-crime gangs are also experimenting with the same JAR-packing techniques.