JS_OBFUSC.CU

July 31, 2013
 Analysis by: Rhena Inocencio
 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 may be hosted on a website and run when a user accesses the said website.

It redirects browsers to certain sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

HTML, HTM

Initial Samples Received Date:

30 Jul 2013

Payload:

Connects to URLs/IPs

Arrival Details

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

Other Details

This Trojan redirects browsers to the following sites:

  • http://{BLOCKED}oatworks.net/adobe/

NOTES:

It checks for the installed Java version.

If 1.5 <= Java version < 1.6.33 or 1.7.0 <= Java version < 1.7.10, it loads a jar file from the following URL and passes parameters to it:

  • http://{BLOCKED}oatworks.net/topic/able_disturb_planning.php?ILdrVx=wMBABhJneOVPwaU&BmHiJIMkczuHJF=yfrFsse

It also checks for the installed Adobe Reader version.

If 8 <= Adobe Reader Version <=8.2, or 9 <= Adobe Reader Version <= 9.3, it redirects users to the following URL:

  • http://{BLOCKED}oatworks.net/topic/able_disturb_planning.php?WbLkJAezBPfO=5257533130&WRywVxstJB=L&CaVgfcyYAy=302g572f5352572i572f333356322e2i545756552d2e&UGJChUwlaal=2d2b2d2b2d2b2d - detected as TROJ_PIDIEF.EQS

  SOLUTION

Minimum Scan Engine:

9.300

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

Close all opened browser windows

Step 3

Remove malware/grayware files dropped/downloaded by JS_OBFUSC.CU

     
    • TROJ_PIDIEF.EQS

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_OBFUSC.CU. 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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