Analysis by: Sabrina Lei Sioting
 Modified by: rolandde
ALIASES:

Trojan:Win32/Cryptrun.B (Trojan:Win32/Cryptrun.B); Trojan.Win32.Genome.aawpt (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

It connects to a website to send and receive information.

It terminates itself if it detects it is being run in a virtual environment.

  TECHNICAL DETAILS

File Size: 91,136 bytes
Memory Resident: Yes
Initial Samples Received Date: 16 Dec 2011
Payload: Compromises system security

Arrival Details

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

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • http://{BLOCKED}.50.225

Other Details

This backdoor connects to the following URL(s) to check for an Internet connection:

  • http://www.google.com/search?qu=

It terminates itself if it detects it is being run in a virtual environment.

NOTES:

It is capable of executing the following backdoor commands:

  • Create/copy/rename/remove/execute files
  • Download a file
  • Enumerate available network resources
  • Enumerate files and folders
  • Enumerate/terminate running processes
  • Upload a file

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.662.01
FIRST VSAPI PATTERN DATE: 23 Dec 2011
VSAPI OPR PATTERN File: 8.663.00
VSAPI OPR PATTERN Date: 23 Dec 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Identify and terminate files detected as BKDR_KRYPTIK.PY

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_KRYPTIK.PY. 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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