JAVA_EXPLOYT.JNU
Trojan.Maljava (Symantec); Troj/JavaBz-UX (Sophos); Trojan.Java.Exploit (Ikarus); Java/Exploit.Agent.RYD (ESET-NOD32); HEUR:Exploit.Java.Generic (Kaspersky)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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. It may be hosted on a website and run when a user accesses the said website.
It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It takes advantage of an unknown vulnerability in a certain software to allow a remote malicious user or malware to download files on the affected machine.
TECHNICAL DETAILS
5,284 bytes
JAR
No
12 Nov 2014
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.
It may be hosted on a website and run when a user accesses the said website.
Download Routine
This Trojan saves the files it downloads using the following names:
- %User Temp%\{random}.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
It downloads a possibly malicious file from a certain URL. The URL where this malware downloads the said file depends on the following parameter(s) passed on to it by its components:
- fool
- twin
Other Details
This Trojan takes advantage of an unknown vulnerability in a certain software to allow a remote malicious user or malware to download files on the affected machine.
SOLUTION
9.700
11.272.03
12 Nov 2014
11.273.00
13 Nov 2014
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
Search and delete these files
- %User Temp%\{random}.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as JAVA_EXPLOYT.JNU. 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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