Trojan:Win32/Waledac.A is a trojan that collects e-mail addresses found on the computer on which it is installed and distributes spam e-mail messages. Win32/Waledac.A may also try to contact different websites for posting data and downloading arbitrary executable files.
System Changes
The following system changes may indicate the presence of this malware:
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The presence of the following registry subkeys:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\PromoReg
or HKCU\Software\Microsoft\Windows\CurrentVersion\Run\PromoReg
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\MyID
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\RList
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Alert notifications from installed antivirus software may be the only symptom(s).
Trojan:Win32/Waledac.A is a trojan that collects e-mail addresses found on the computer on which it is installed and distributes spam e-mail messages. Win32/Waledac.A may also try to contact different websites for posting data and downloading arbitrary executable files.
Installation
In the wild, links to malicious Web sites hosting the trojan have been distributed via spam e-mail messages. Messages may contain content of current events such as holidays, historical, social and political events. If a user visits the link to the site hosting Win32/Waledac, the user could accidentally or unknowingly execute the trojan. This trojan does not copy itself to specific folders but does modify the registry to execute the trojan at each Windows start.
Adds value: "PromoReg"
With data: "<Win32/Waledac filename>"
To subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
If the trojan is unable to add the value and data to the 'HKLM' registry hive, 'HKCU' is used instead, as in this example:
Adds value: "PromoReg"
With data: "<Win32/Waledac filename>"
To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Win32/Waledac makes additional registry modifications.
Adds value: "MyID"
With data: <random hexadecimal string>
To subkey: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion
Adds value: "RList"
With data:
<random hexadecimal string>
To subkey: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion
Payload
Gathers E-mail Addresses
When run, Win32/Waledac collects email addresses found inside files stored on the infected computer ignoring files having the following file extensions:
archive files
.7z
.gz
.zip
.rar
.jar
.hxw
.hxh
.hxn
.hxd
media files
.avi
.mov
.wmv
.mp3
.wave
.wav
.wma
.ogg
.vob
.jpg
.jpeg
.gif
.bmp
executable files
.exe
.dll
.ocx
.class
.msi
Sends E-mail Containing Link
Win32/Waledac sends e-mail messages to addresses collected from the infected computer containing text that may reference a current event and a link to a malicious Web site hosting a copy of the trojan. Users receiving a copy of the e-mail that click the link risk becoming infected.
Sends Collected Data
Win32/Waledac may send gathered data to Web sites hosted on the following IP addresses using HTTP POST:
114.121.11.161
114.121.94.207
114.139.151.178
114.240.77.108
114.243.227.170
114.30.78.72
114.48.26.148
114.48.35.20
114.58.94.25
115.42.67.168
115.60.44.193
116.24.168.139
116.5.128.86
116.71.173.72
116.72.4.161
116.72.52.141
116.73.3.47
116.74.113.5
116.74.144.201
116.74.180.211
116.75.183.9
117.102.44.30
117.123.183.229
117.195.100.160
117.197.96.74
117.198.1.67
117.199.115.159
117.20.186.215
117.200.51.55
117.24.158.214
117.83.246.124
117.92.80.209
118.118.67.18
118.127.217.220
118.128.114.126
118.129.59.133
118.131.88.121
118.38.17.7
118.47.182.35
118.95.99.129
119.122.26.22
119.154.20.130
119.199.154.42
119.205.8.140
119.73.119.88
119.99.22.50
12.150.205.250
120.136.97.101
120.50.87.39
121.127.80.231
121.127.80.251
121.134.122.81
121.138.127.132
121.139.167.150
121.149.122.79
121.166.7.96
121.175.111.187
121.189.139.242
121.227.106.205
121.246.217.107
121.253.33.166
121.254.47.208
121.29.99.107
121.61.33.138
124.122.154.164
124.123.96.207
124.128.167.211
124.135.80.106
124.153.156.121
124.153.206.90
124.153.234.73
124.199.7.179
124.225.46.155
124.244.14.154
124.72.40.178
124.80.227.126
125.142.96.142
125.162.68.217
125.182.24.85
125.209.17.183
125.69.26.169
125.99.155.243
140.112.164.50
140.129.29.53
165.132.24.87
165.194.59.92
200.163.155.244
200.241.188.251
201.160.73.112
201.214.15.243
201.5.172.207
210.0.47.10
210.0.47.208
210.108.199.211
210.124.121.129
210.181.231.216
210.197.58.172
210.2.39.76
210.210.245.92
210.4.125.182
210.6.108.130
210.93.101.23
211.111.42.214
211.162.211.45
211.246.236.63
211.247.51.24
211.53.55.65
211.55.159.63
213.93.5.156
217.120.224.190
217.144.209.71
217.162.74.225
217.8.92.78
220.164.197.91
220.197.33.74
220.226.36.237
220.226.40.223
221.124.70.181
221.133.150.165
221.137.83.234
221.165.95.226
24.118.126.63
24.122.25.65
24.13.237.40
24.13.27.63
24.79.177.228
24.87.10.186
59.126.29.61
60.180.113.234
60.223.169.190
61.0.139.54
61.102.212.18
61.140.147.19
61.187.142.35
61.21.22.112
61.221.97.205
61.238.138.42
61.244.107.17
61.247.143.13
61.247.69.217
61.35.248.86
61.47.206.90
61.47.247.17
61.5.16.245
61.97.134.116
64.38.80.181
64.53.137.43
65.28.6.131
66.169.35.82
66.178.64.133
66.66.84.183
67.191.81.183
67.213.97.27
68.146.148.152
69.229.5.95
70.121.201.5
70.234.247.240
71.72.145.205
72.18.123.209
76.122.130.170
76.170.240.153
76.186.203.78
77.81.80.145
80.191.155.88
82.231.195.46
83.226.56.24
83.253.33.29
83.86.119.114
84.16.228.132
85.170.190.210
85.196.70.44
85.9.88.222
86.126.99.213
86.3.128.70
87.246.26.145
88.134.163.181
88.183.217.78
88.216.29.47
89.165.81.152
89.204.23.72
89.228.206.128
89.234.220.89
89.76.120.87
93.123.6.132
93.81.129.119
99.237.49.68
Analysis by Jireh Sanico and Cristian Craioveanu
Take the following steps to help prevent infection on your system:
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Enable a firewall on your computer.
-
Get the latest computer updates for all your installed software.
-
Use up-to-date antivirus software.
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Use caution when opening attachments and accepting file transfers.
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Use caution when clicking on links to web pages.
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Protect yourself against social engineering attacks.
Enable a firewall on your computer
Use a third-party firewall product or turn on the Microsoft Windows Internet Connection Firewall.
To turn on the Windows Firewall in Windows Vista
-
Click Start, and click Control Panel.
-
Click Security.
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Click Turn Windows Firewall on or off.
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Select On.
-
Click OK.
To turn on the Internet Connection Firewall in Windows XP
-
Click Start, and click Control Panel.
-
Click Network and Internet Connections. If you do not see Network and Internet Connections, click Switch to Category View.
-
Click Change Windows Firewall Settings.
-
Select On.
-
Click OK.
Get the latest computer updates
Updates help protect your computer from viruses, worms, and other threats as they are discovered. It is important to install updates for all the software that is installed in your computer. These are usually available from vendor websites.
You can use the Automatic Updates feature in Windows to automatically download future Microsoft security updates while your computer is on and connected to the Internet.
To turn on Automatic Updates in Windows Vista
-
Click Start, and click Control Panel.
-
Click System and Maintainance.
-
Click Windows Updates.
-
Select a setting. Microsoft recommends selecting Install updates automatically and choose a time that is convenient for you. If you do not choose Automatic, but you choose to be notified when updates are ready, a notification balloon appears when new downloads are available to install. Click the notification balloon to review and install the updates.
To turn on Automatic Updates in Windows XP
-
Click Start, and click Control Panel.
-
Click System.
-
Click Automatic Updates.
-
Select a setting. Microsoft recommends selecting Automatic. If you do not choose Automatic, but you choose to be notified when updates are ready, a notification balloon appears when new downloads are available to install. Click the notification balloon to review and install the updates.
Use up-to-date antivirus software
Most antivirus software can detect and prevent infection by known malicious software. To help protect you from infection, you should always run antivirus software that is updated with the latest signature files. Antivirus software is available from several sources. For more information,
see http://www.microsoft.com/protect/computer/viruses/vista.mspx.
Use caution when opening attachments and accepting file transfers
Exercise caution with e-mail and attachments received from unknown sources, or received unexpectedly from known sources. Use extreme caution when accepting file transfers from known or unknown sources.
Use caution when clicking on links to web pages
Exercise caution with links to web pages that you receive from unknown sources, especially if the links are to a web page that you are not familiar with or are suspicious of. Malicious software may be installed in your system simply by visiting a web page with harmful content.
Avoid downloading pirated software
Threats may also be bundled with software and files that are available for download on various torrent sites. Downloading "cracked" or "pirated" software from these sites carries not only the risk of being infected with malware, but is also illegal. For more information. please see our article '
The risks of obtaining and using pirated software'.
Protect yourself from social engineering attacks
While attackers may attempt to exploit vulnerabilities in hardware or software in order to compromise a system, they also attempt to exploit vulnerabilities in human behavior in order to do the same. When an attacker attempts to take advantage of human behavior in order to persuade the affected user to perform an action of the attacker's choice, it is known as 'social engineering'. Essentially, social engineering is an attack against the human interface of the targeted system. For more information, please see our article '
What is social engineering?'.
