Infection Channel: Downloaded from the Internet, Dropped by other malware
This malware is involved in the Blackhole Exploit Kit (BHEK) attacks in January 2013. It takes advantage of a zero-day vulnerability (CVE-2013-0422) in Java in order to drop ransomware. Victims may find themselves being extorted for money.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
For the related story, you may read the blog post Microsoft, Oracle Release Security Fixes for Zero-Day Exploits
This Trojan may be downloaded by other malware/grayware from remote sites.
It takes advantage of unknown vulnerabilities in certain software to download malicious files.
File size: Varies
File type: JAR
Initial samples received date: 10 Jan 2013
Payload: Downloads files
Arrival Details
This Trojan may be downloaded by the following malware/grayware from remote sites:
It may be downloaded from the following remote site(s):
- http://{BLOCKED}enhaupdad.bounceme.net/read/UTTER-OFFEND.JAR
Download Routine
This Trojan takes advantage of unknown vulnerabilities in the following software to download malicious files:
- Java Runtime Environment (1.7 Update 9 & Update 10)
It takes advantage of the following software vulnerabilities to download possibly malicious files:
- Oracle Java 7 Security Manager Bypass Vulnerability (CVE-2013-0422)
It saves the files it downloads using the following names:
- %User Profile%\awt43abr.exe
- %User Profile%\berstrestvers.exe
- %User Profile%\bawt34tv.exe
- %User Profile%\tab4vrtve.exe
- %User Profile%\wgsdgsdgdsgsd.exe
- %User Profile%\ab43yctewatv.exe
- %User Profile%\a43vtzgbdgv.exe
- %User Profile%\atv4tvq34.exe
- %User Profile%\bg34dfbewgba4.exe
- %User Profile%\av4a43by4ayb.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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:
Other Details
This Trojan executes the downloaded file using the following commands:
- regsvr32 -s %User Profile%\{file name}.exe
- %User Profile%\{file name}.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
NOTES:
This malware exploits the vulnerability found in Java Runtime Environment 1.7 Update 9 and Update 10.
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