Feeds

Apache attack drives traffic to malware

Blackhole redirect served by modified daemon binary

5 things you didn’t know about cloud backup

A security researcher is warning that an attack on the Apache Web server is increasingly showing up in the wild, and has published a free Python tool to check their configurations.

The attack is designed to avoid leaving disk footprints, according to this post analysing the backdoor. It exists as a modified httpd file that redirects HTTP requests to the well-known Blackhole exploit pack.

Redirected victims hitting the compromised server are remembered so they aren't redirected a second time. The redirection looks like the original URL, with a base64 encoded string added, used by the backdoor to record parameters describing the redirected client to ensure the right payload is delivered (for example, identifying if it had originally requested a Javascript file).

Apart from the modified httpd file, everything associated with the exploit exists only in 6 MB of shared memory, with configuration pushed through obfuscated HTTP requests to evade logging.

The analysis has identified 23 commands in the binary, all of them two-character hex bytes (DU, ST, T1 and so on). Thos commands are invoked by a POST command to a crafted URL including “SECID=” as a cookie header. As the author of the post, Pierre-Marc Bureau notes, “we believe the URLs to redirect clients are sent to the backdoor using this method. The redirection information will be stored encrypted in the allocated shared memory region.”

Other capabilities of the commands include:

  • Setting redirection conditions;
  • Whitelisting user agents; and
  • Blacklisting IP addresses to avoid detection.

Because the attack sets loose permissions on the shared directory, other processors can access it. This tool, dump_dcorked_config.py, verifies the presence of the shared memory region and dumps its contents into a file for analysis. ®

Next gen security for virtualised datacentres

More from The Register

next story
Snowden on NSA's MonsterMind TERROR: It may trigger cyberwar
Plus: Syria's internet going down? That was a US cock-up
Who needs hackers? 'Password1' opens a third of all biz doors
GPU-powered pen test yields more bad news about defences and passwords
e-Borders fiasco: Brits stung for £224m after US IT giant sues UK govt
Defeat to Raytheon branded 'catastrophic result'
Microsoft cries UNINSTALL in the wake of Blue Screens of Death™
Cache crash causes contained choloric calamity
Germany 'accidentally' snooped on John Kerry and Hillary Clinton
Dragnet surveillance picks up EVERYTHING, USA, m'kay?
Linux kernel devs made to finger their dongles before contributing code
Two-factor auth enabled for Kernel.org repositories
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 10 endpoint backup mistakes
Avoid the ten endpoint backup mistakes to ensure that your critical corporate data is protected and end user productivity is improved.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Rethinking backup and recovery in the modern data center
Combining intelligence, operational analytics, and automation to enable efficient, data-driven IT organizations using the HP ABR approach.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.