Threat Encyclopedia

ELF_BASHLITE.A

Publish date: September 26, 2014

PLATFORM:

Linux, UNIX

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:
INFORMATION EXPOSURE:

  • Threat Type:Backdoor

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet


This malware is involved in the Bash Vulnerability Exploit attack of September 2014. It is capable of compromising an affected system's security by carrying out commands made by a malicious remote user. In the attack, it is utilized to perform distributed denial-of-service (DDoS) attacks as well as brute-forcing logins in order to steal login credentials.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor executes commands from a remote malicious user, effectively compromising the affected system.

TECHNICAL DETAILS

File Size:

Varies

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

26 Sep 2014

Payload:

Compromises system security, Connects to URLs/IPs

Arrival Details

This backdoor may be downloaded from the following remote site(s):

  • http://{BLOCKED}.{BLOCKED}.66.76/nginx

This malware arrives via the following means:

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • UDP - Perform UDP flooding
  • TCP - Perform TCP flooding
  • LOLNOGTFO - terminate botnet
  • KILLATTK - terminate attack thread
  • JUNK - Perform Junk Flooding
  • HOLD - Pause or delay attack for specified duration
  • GETLOCALIP - Get Local IP address
  • PING
  • SCANNER

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.150.154:5

NOTES:

It uses the following list of usernames and passwords to brute force login:

  • root
  • user
  • login
  • guest
  • toor
  • admin
  • user
  • guest
  • login
  • changeme
  • 1234
  • 12345
  • 123456
  • default
  • pass
  • password

It gathers the following information:

  • CPU information (/proc/cpuinfo)
  • Network information (/proc/net/route)

If the Scanner command is ON, it executes the following:

  • /bin/busybox;echo -e ‘gayfgt’\r\n

SOLUTION

Minimum Scan Engine:

9.700

VSAPI OPR PATTERN File:

11.171.00

VSAPI OPR PATTERN Date:

26 Sep 2014

Scan your computer with your Trend Micro product to delete files detected as ELF_BASHLITE.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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