Analysis by: RonJay Kristoffer Caragay
ALIASES:

JS/Kryptik.ARX trojan (NOD32)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as a component bundled with malware/grayware packages. It may be hosted on a website and run when a user accesses the said website.

It requires its main component to successfully perform its intended routine. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 3,265 bytes
File Type: HTML, HTM
Memory Resident: No
Initial Samples Received Date: 11 Aug 2014

Arrival Details

This Trojan arrives as a component bundled with malware/grayware packages.

It may be hosted on a website and run when a user accesses the said website.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

It requires the existence of the following files to properly run:

  • lspinq/2f12b8b.js

However, as of this writing, the said sites are inaccessible.

NOTES:

This malware is hosted on the following sites:

  • http://{BLOCKED}l8r1bihsjwuj1n4zf.casaeclectica.com.mx/kafecodes/kholdq/zwen.php

It creates an iframe or redirects to certain URLs depending on the parameter it receives.

It may redirect to the following URL:

  • {malware’s host}/{malware’s URL path}/blondonn.php

The iframe consists of any of the following URL that is appended to the current URL:

  • {malware’s host}/{malware’s URL path}/xescapingc.php
  • {malware’s host}/{malware’s URL path}/mheret.php
  • {malware’s host}/{malware’s URL path}/psuperiorg.php - also detected as JS_AGENT.APSS
  • {malware’s host}/{malware’s URL path}/dperilsi.php
  • {malware’s host}/{malware’s URL path}/rcommittede.php
  • {malware’s host}/{malware’s URL path}/mhinderb.php
  • {malware’s host}/{malware’s URL path}/egovernmentc.php
  • {malware’s host}/{malware’s URL path}/rhandclaspk.php
  • {malware’s host}/{malware’s URL path}/abulgingq.php

{malware’s host URL}/{malware’s URL path}/psuperiorg.php inserts the .SWF file {malware’s host URL}/{malware’s URL path}/lspinq/30734a.swf with the following parameter:

FlashVars ="urli=http://{BLOCKED}l8r1bihsjwuj1n4zf.{BLOCKED}lectica.com.mx/kafecodes/kholdq/lodlwithr.php?id=4"

  SOLUTION

Minimum Scan Engine: 9.700

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_AGENT.APSS. 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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