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error.log - Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8g mod_fastcgi/2.4.6 mod_fcgid/2.3.4

[Mon Oct 10 22:35:18 2011] [error] [client] (36)File name too long: access to /forums/index.php++++++++++++++++++++++++++++++++Result:+%e8%f1%ef%ee%eb%fc%e7%ee%e2%e0%ed+%ed%e8%ea%ed%e5%e9%ec+%22immultusa%22%3b+%e7%e0%f0%e5%e3%e8%f1%f2%f0%e8%f0%ee%e2%e0%eb%e8%f1%fc+(%e2%ea%eb%fe%f7%e5%ed+%f0%e5%e6%e8%ec+%f2%ee%eb%fc%ea%ee+%f0%e5%e3%e8%f1%f2%f0%e0%f6%e8%e8)%3b failed, referer:
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up vote 11 down vote accepted

Probably someone trying to create an account on your forum and proceed to spam it.

I read about it here:

When you URL decode the string two times and google the string you find a lot of spam on different forums.

URL Decoded one time:

èñïîëüçîâàí íèêíåéì "immultusa"; çàðåãèñòðèðîâàëèñü (âêëþ÷åí ðåæèì òîëüêî ðåãèñòðàöèè); 
failed, referer:

URL Decoded twice:

èñïîëüçîâàí íèêíåéì "immultusa"; çàðåãèñòðèðîâàëèñü (âêëþ÷åí ðåæèì òîëüêî ðåãèñòðàöèè); 
failed, referer:                                
Result: èñïîëüçîâàí íèêíåéì "immultusa"; çàðåãèñòðèðîâàëèñü (âêëþ÷åí ðåæèì òîëüêî 
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Also, the garbled-looking text appears to be in the CP1251 encoding, and says использован никнейм "immultusa"; зарегистрировались (включен режим только регистрации). Alas, I don't really speak Russian, but it seems to be saying something about the nickname "immultusa" being already registered. – Ilmari Karonen Oct 15 '11 at 16:50
Ah thanks, I was wondering about the garbled text... how did you know it was in that encoding? – Steven Oct 16 '11 at 9:43
It looked like URL encoding based on experience of seeing url encoded text before. Then I just dumped it into Burp Suite decoder and chose URL decode and it gave me more sensible data. Thanks to @Ilmari Karonen for discovering the character encoding – Chris Dale Oct 16 '11 at 10:02
@Steven: It looked like some 8-bit encoding for non-Latin text. I actually first thought it might be KOI8, but that didn't yield anything meaningful, so I wrote a quick Perl one-liner to print it using all the encodings supported by Encode::Byte and eyeballed the results to see which one made sense. – Ilmari Karonen Oct 16 '11 at 15:12

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