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Win32.Jeefo.A

( Win32.Jeffo.A )
Spreading: medium
Damage: medium
Size: 36.352 bytes, written in MinGW
Discovered: 2003 Jun 07

SYMPTOMS:

- Presence of the file "svchost.exe" in the Windows directory
- Under Windows 9x/Me, the key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
RunServices contains the value "PowerManager" which points to "svchost.exe"
- Under Windows NT/2000/XP, presence of the "Power Manager" service. This service has the description: 'Manages the power save features of the computer.'

TECHNICAL DESCRIPTION:

This executable file infector is written in MinGW and presents a very interesting (and difficult to disinfect) infection technique. It contains various strings, encrypted with a trivial algorithm:

.text:004012B0 decryption_loop:
.text:004012B0 mov cl, [edx+ebx]
.text:004012B3 dec cl
.text:004012B5 mov [edx+eax], cl
.text:004012B8 inc edx
.text:004012B9 cmp edx, edi
.text:004012BB jl short decryption_loop

When an infected file is executed for the first time, the virus receives control and dumps a copy of itself in the Windows directory as svchost.exe and registeres itself to be executed at every system startup: under Windows 9x/Me it adds a key to HKEY_LOCAL_MACHINE \Software\Microsoft\Windows\CurrentVersion\RunServices; under NT/2000/XP, it creates a service called "Power Manager".

The file infection algorithm is complex; in some cases, infected files get corrupted (the virus is not capable of handling certain resource types).

The infected file has the following layout:
1) Virus
2) Original file\'s resources (bitmaps, icons, etc) -> thus the infected file has the same main icon as the original file
3) Original file chunks - encrypted

The disinfection routine decrypts the file chunks, re-links the file, adds the resources and re-locates them to the new relative virtual address. Resource relocation is tricky and in some cases may cause the virus to fail (crash); however, these files are correctly disinfected by BitDefender.

The virus contains the following text string: "Hidden Dragon virus. Born in a tropical swamp." encrypted with the same trivial encryption algorithm as above. When encrypted, the word "hidden" is transformed to "iJeefo" (this is where this virus got his name from).

Removal instructions:

Let BitDefender disinfect the files it found infected. When BitDefender encounters the "host" file (pure virus dropper), it will automatically delete it.

ANALYZED BY:

BitDefender AV Research Team
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Bitdefender e-Guides Series

The Bitdefender e-Guides series is a learning initiative aiming to provide the Bitdefender reader and user community with valuable information about e-threats and the security issues of the IT&C realm, while also offering practical advice and feasible solutions to their on-line defense needs. The Bitdefender security analysts share their knowledge in malware prevention, identification and annihilation, with an emphasis on on-line privacy and different technologies, countermeasures and cybercrime prevention methods.

Covering topics that range from kids and family's on-line protection, safe social networking and preventing data safety breaches to securing enterprise environments, the e-Guides series is intended for a broad audience of small organizations and individual users concerned about the safety and integrity of their networks and systems. The e-Guides also address issues pertaining to the daily activity of IT&C Systems Security Managers, System and Network Administrators, Security Technology Developers, Analysts, and Researchers.

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Tips and tricks on how to keep your blog and your identity safe

Safe Blogging Guide

Blogging is one of the most popular forms of written expression on the web, with more than 150 million indexed blogs worldwide. While regular readers are looking for pieces of information and articles, cyber-crooks take a different interest in them. Finding private information and getting cheap storage space for their malware campaigns are only two of the multitude of users they may subject your blog to.

This material covers the basic guidelines for safe blogging and is especially focused on individual blogs that are either self-hosted or provided as a service by major blog providers.



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The following guide will teach you the best practices when using unsecured wireless networks, as well as how to properly configure your home router or access point to prevent others from abusing your network.



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This e-Guide covers the main risks and dangers for kids on-line, such as cyber-bulling, exposure to inappropriate content, on-line addiction and other harmful online actions, while also focusing on topics such as malware, phishing, ID theft and spam, to which teenagers, just as any other Internet users, are exposed nowadays. A Safety Tips section helps parents and teachers better understand and deal with these issues in relation to the kids.



Silver Surfers On-line Safety Guide

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Preventing Data Breaches Guide

How to protect valuable ideas and assets from cyber-hacking


The e-guide was designed to cover the various potential sore points of business data safety, from the matter of the network's physical integrity to the complicated mechanisms of business targeted cybercrime (e.g. banker Trojans, phishing). This material is also intended to match, though not in as much detail as a full-fledged technical description, the features of the various consumer and business oriented Bitdefender solutions to the situations in which they might come in handy to IT administrators.

Consulting this document would be useful in the process of deciding what's best for small to medium-sized networks security and a solid basis for further comparative research on this subject.

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Bitdefender E-Threats Landscape Reports

The purpose of this report is to provide a comprehensive investigation of the threats’ landscape. Bitdefender’s security experts thoroughly analyze and examine the menaces of the each semester, focusing on software vulnerabilities and exploits, different types of malware, as well as countermeasures, cyber crime prevention and law enforcement.The E-Threats Landscape Report concentrates mainly on the latest trends, but it also contains facts and data and concerning the previously investigated periods, as well as several predictions related to the upcoming semesters.This document is primarily intended for IT&C System’s Security Managers, System and Network Administrators, Security Technology Developers, Analysts, and Researchers, but it also addresses issues pertaining to a broader audience, like small organizations or individual users concerned about the safety and integrity of their networks and systems.

H2 2012 E-Threat Landscape Report - Overview

For the first half of the year, zero-day vulnerabilities played an essential role in disseminating malware with exploit packs as a favorite vector of infection. The dangerous zero-day exploit in the Java Runtime Environment (CVE-2012-4681) was documented and proof of concept was added to Metasploit, which became public knowledge before a fix was made available.

As a direct result, three billion devices running Java were vulnerable to remote code exploitation for roughly 48 hours. A second exploit hit in September and targeted Internet Explorer 9. Successful exploitation would allow remote compromise of the system with the installation of the Poison Ivy backdoor. Both zero-day exploits were used in advanced persistent attacks.

2012 saw fluctuations in the amount of junk e-mail as a proportion of e-mail traffic. The year began with a slight decrease in spam e-mails, but spam constantly gained ground towards the middle of the year. According to data gathered from the Bitdefender Antispam lab, the second half saw growth again, with small variations towards the end of 2012. The increase in the number of junk e-mails was nonetheless minor, by only 5%, leading to a rough value of 73% of the total number of e-mails sent worldwide.

Download now the full H2 2012 E Threat Landscape Report (pdf)

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Archive

2012
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2011
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2010
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2009
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2008
Download now H1 2008 E-Threats Landscape Report (pdf)
Download now H2 2008 E-Threats Landscape Report (pdf)

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