Win32/Waledac is a trojan that is used to send spam. It also has the ability to download and execute arbitrary files, harvest email addresses from the local machine, perform denial of service attacks, proxy network traffic and sniff passwords.
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 e-mail addresses found inside files stored on the infected computer. It searches fixed and remote drives for files to target, ignoring files with 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
.png
.jpg
.jpeg
.gif
.bmp
executable files
.exe
.dll
.ocx
.class
.msi
Modifies security settings
Depending on how the affected computer is networked, Waledac may add itself to the Windows Firewall Authorized Applications list and in order to bypass the firewall when accessing the Internet. It adds the following 3 exceptions to the list for the name "Promo":
-
Communications via TCP port 80
-
Communications via UDP port 53
-
Communications from the Waledac executable itself
Steals sensitive data
Waledac attempts to steal sensitive data during transit. This could include user names and passwords. It targets the following protocols when attempting to capture sensitive data:
-
SMTP - port 25
-
POP - port 110
-
HTTP - port 80
-
FTP - port 21
Distributes and receives remote commands via distributed P2P network
Waledac can distribute and receive commands from other computers infected with Waledac via its own peer-to-peer (P2P) network. Using this distributed method of unauthorized access and control of an affected machine, a remote attacker can perform the following actions:
-
Download and execute arbitrary files
-
Perform Denial of Service attacks against a specified target
-
Establish SOCKS 5 Proxy (can be used for several purposes including hiding the origin of malicious network activity).
-
Start an HTTP server - port 80
-
Start a DNS server - port 53
-
Send captured data to a remote location
-
Sends e-mail messages after receiving configuration and targeting data
Waledac is distributed with an initial list of peers to contact. It has been observed contacting the following IP addresses in this fashion:
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 Scott Molenkamp
