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Aggressive Scans by Hajime Botnet Targeting Port 8291 With a new Exploit

March 28, 2018

Hajime Botnet variant made a massive come back with new features and this time it targets port 8291 to check whether the device running vulnerable Mikrotik RouterOS.

 

Attackers propagating the bot to exploit the vulnerabilities in the RouterOS that allow’s them to execute remote execution code on the device.

 

The MikroTik RouterOS is based on the Linux kernel and it is mostly used by ISPs and the botnet is exploiting the known vulnerabilities in HTTP, SMB and password brute forcing.

 

How the Infection Takes place – Port 8291

 

The latest variant of Hajime Botnet is efficient to launch an aggressive scanning over Port 8291 to detect the publically available devices and to exploit the devices connected with it.

 

‘Chimay Red‘ HTTP Exploit code found in the attack modules that could exploit the vulnerability in its HTTP web server process due to improper validation of user-supplied input.

 

 

 

The worm launches a very aggressive SYN scan to port 8291 and if the port 8291 is open it check’s for other common ports next (80,81,82,8080,8081,8082,8089,8181,8880). It uses to check the device version and sends the exploit shellcodes.

 

How to protect your Organization From DDOS Attack

 

 

Netlab logged more than 861,131 unique scan source IPs (72 Hours). Netlab and Radware witnessed over 10,000 unique IPs hitting port 8291 in a single day.

 

According to Netlab, the top three scan sources are Brazil (585k), Iran (51.8k), Russia (26.4k). Radware and Netlab published technical write-ups.

Suggested mitigations

  • Block unwanted request via 8291.

  • Update MikroTik firmware to v6.41.3 (or at least, above v6.38.5).

IOC

06B4D50254C6C112437A3ED893EF40B4 .i.mipseb

93A1A080FCDE07E512E7485C92861B69 atk.mipseb

fc834c015b357c687477cb9116531de7 atk.mipseb.upx.unpack

 

 

 

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