利用Nmap工具查找网络中Downadup/Conficker的蠕虫病毒源

1 Downadup/Conficker

Conficker主要利用Windows操作系统MS08-067漏洞来传播,同时也能借助任何有USB接口的硬件设备来感染,在2008年被发现,并在微软的MS08-067补丁中被修复。但直到如今,仍有不少局域网中发现有Downadup蠕虫病毒感染,有些杀毒软件仍然不给力,无法找到病毒源头,导致在某些机器上不断地重复发现Downadup报告,但无法删除。


2 Nmap脚本引擎smb-check-vulns.nse

Nmap提供了强大的脚本引擎(NSE),以支持通过Lua编程来扩展Nmap的功能。除了常见的主机发现、端口扫描等功能外,脚本引擎扩展了其他更加多样化的功能,如检查常见的漏洞信息以及本片文章提到的检查蠕虫感染功能。


smb-check-vulns脚本的介绍和源码下载可以在nmap.org官网上获得:

http://nmap.org/nsedoc/scripts/smb-check-vulns.html


smb-check-vulns脚本可以查看以下漏洞:

MS08-067, a Windows RPC vulnerability

Conficker, an infection by the Conficker worm

Unnamed regsvc DoS, a denial-of-service vulnerability I accidentally found in Windows 2000

SMBv2 exploit (CVE-2009-3103, Microsoft Security Advisory 975497)

MS06-025, a Windows Ras RPC service vulnerability

MS07-029, a Windows Dns Server RPC service vulnerability


其中关于Conficker的检查,mnap是基于以下的这个Conficker扫描器

http://net.cs.uni-bonn.de/wg/cs/applications/containing-conficker


3 Nmap扫描实例

此工具用来检测远程可疑源的具体使用命令如下:
nmap -PN -T4 -p139,445 -n -v --script smb-check-vulns,smb-os-discovery--script-args safe=1 [targetnetworks]
如:
nmap -PN -T4 -p139,445 -n -v --script smb-check-vulns, smb-os-discovery--script-args safe=1 100.10.1.*
方便起见,可以将其导出到一个文件中:
nmap -PN -T4 -p139,445 -n -v --scriptsmb-check-vulns,smb-os-discovery --script-args safe=1 [targetnetworks] >nmap_result.log

从日志里面找关键字,可以确定病毒源的位置。

Host 172.30.160.22 is up (0.00s latency).
Interesting ports on 172.30.160.22:
PORT    STATE SERVICE
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
MAC Address: 00:E0:4C:1E:22:B8 (RealtekSemiconductor)

Host script results:
|  smb-os-discovery: Windows XP
|  LAN Manager: Windows 2000 LAN Manager
|  Name: WORKGROUP\WH013
|_ System time: 2009-12-21 17:10:57 UTC+8
|  smb-check-vulns:  
|  MS08-067: CHECK DISABLED (remove 'safe=1'argument to run)
|  Conficker: UNKNOWN; not Windows, orWindows with disabled browser service (CLEAN); or Windows with crashed browserservice (possibly INFECTED).
|  |  If you know the remote system isWindows, try rebooting it and scanning
|  |_ again. (ErrorNT_STATUS_OBJECT_NAME_NOT_FOUND)
|_ regsvc DoS: CHECK DISABLED (add'--script-args=unsafe=1' to run)


Host 172.30.160.40 is up (0.00s latency).
Interesting ports on 172.30.160.40:
PORT    STATE SERVICE
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
MAC Address: 00:16:76:A8:D4:1F (Intel)

Host script results:
|  smb-os-discovery: Windows XP
|  LAN Manager: Windows 2000 LAN Manager
|  Name: SZWH\WH-ASP-04
|_ System time: 2009-12-21 17:09:06 UTC+8
|  smb-check-vulns:  
|  MS08-067: CHECK DISABLED (remove 'safe=1'argument to run)
| Conficker: Likely INFECTED (by Conficker.C or lower)
|_ regsvc DoS: CHECK DISABLED (add'--script-args=unsafe=1' to run)



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