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TROJ_PYSHELL.B

October 03, 2014
 PLATFORM:

Linux, UNIX

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

1,071 bytes

File Type:

PY

Memory Resident:

No

Initial Samples Received Date:

29 Sep 2014

Payload:

Compromises system security

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

NOTES:

It reads the password file (/etc/passwd) of a server running a UNIX or Unix-like systems.

It exploits the following vulnerability to execute shell commands on a remote server specified in its command line:

Upon successfully exploiting this vulnerability, the following shell command is executed in the remote server to list the contents of the password file:

  • a=`/bin/cat /etc/passwd`;echo "a: $a"

If the password file contains "root" or "bin/bash", it displays the following message:

  • target possible have bug under is *nix passwd file{the actual contents of the password file)

If the password file neither contains "root" nor "bin/bash", it displays the following message instead:

  • possible dont have bug! or have a waf!

  SOLUTION

Minimum Scan Engine:

9.700

Scan your computer with your Trend Micro product to delete files detected as TROJ_PYSHELL.B. 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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