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Trojan:Win32/Waledac


Trojan:Win32/Waledac 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.


What to do now

Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see http://www.microsoft.com/security/antivirus/av.aspx.

Threat behavior

Trojan:Win32/Waledac 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

Symptoms

System Changes
The following system changes may indicate the presence of this malware:
  • 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
  • Alert notifications from installed antivirus software may be the only symptom(s).

Prevention


Alert level: Severe
First detected by definition: 1.45.287.0
Latest detected by definition: 1.173.2373.0 and higher
First detected on: Oct 07, 2008
This entry was first published on: Apr 06, 2009
This entry was updated on: Apr 17, 2011

This threat is also detected as:
  • W32/Waledac.gen (McAfee)
  • W32.Waledac (Symantec)