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JS_BLACOLE.MT
Aliases: Exploit:JS/Blacole.GB (Microsoft), JS/Exploit-Blacole.a!heur !! (McAfee)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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 does not have any propagation routine.

It does not have any backdoor routine.

It does not have any downloading capability.

It does not have any information-stealing capability.

It redirects browsers to certain sites.

Technical Details


File size: varies
File type: HTML, HTM
Initial samples received date: 31 May 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.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan redirects browsers to the following sites:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/723b5b8e0ef806c8/a.php?jnlp=3de182668d

NOTES:

It connects to any of the following sites to load a .JAR file

For Java version below 1.7.9:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/a.php?uuscj=hyilovh&tjxebx=jqsn

It passes the following values to the .JAR file:

parameter name 1: prime;
value: 8yhwtlAwKqjBh1?4?refe.rfP%rjBh1?4?refe.rfP%rjVw3D3x3.b6-O11O6-O6DO16R?eb68O16O1hO6AO6oO6DO6-O6-O6oO16R?b6.RD?bSR3Vbl

parameter name 2: val
value: Dyy3Ojjle0

For Java versions below 1.6.33 or below 1.6:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/a.php?ypbx=syys&zmoi=oiphw

It passes the following values to the .JAR file:

parameter name 1: prime
value: 8yhwtlAwKqjBh1?4?refe.rfP%rjBh1?4?refe.rfP%rjVw3D3x3.b6-O11O6-O6DO16R?eb68O16O1hO6AO6oO6DO6-O6-O6oO16R?b6.RD?bSR3Vbl

parameter name 2: val
value: Dyy3Ojjle0

It connects to any of the following sites to load a PDF:

For PDF version below 8:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/a.php?lygaw=6f62d&gmlp=aal&anqvbhw=1i:31:32:1g:1n:1h:1l:1l:1n:31&velf={pdfversion}

For PDF version 8 or below 9.4:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/a.php?vae=6f62d&vfxjcn=i&ovkwvpvk=1i:31:32:1g:1n:1h:1l:1l:1n:31&glo={pdfversion}

For Flash versions above 10.0.40 or below 10.2 or below 10.2.159:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/a.php?gimias=6f62d&qynrar=nryy&exgvqik=1i:31:32:1g:1n:1h:1l:1l:1n:31&ewiman=prur

For Flash versions 10.3.181 and below:

  • http://{BLOCKED}2.org.uk/723b5b8e0ef806c8/a.php?wfpyab=6f62d&iucl=vcqrvb&xydrznt=1i:31:32:1g:1n:1h:1l:1l:1n:31&info=02e6b1525353caa8ad5530b7b7564ba8b15530ad51b7ac4d4d48344837c8324f3237c94a4a31ccba6e32ae51b252ca3556b1cf4f7e7ac1d66e2b

It does not have rootkit capabilities.

It does not exploit any vulnerability.

Solution


Minimum scan engine: 9.300
First VSAPI Pattern File: 9.954.02
First VSAPI Pattern Release Date: 01 Jun 2013
VSAPI OPR Pattern Version: 9.955.00
VSAPI OPR Pattern Release Date: 02 Jun 2013

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

Scan your computer with your Trend Micro product to delete files detected as JS_BLACOLE.MT. 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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Analysis By: Rhena Inocencio

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