File: 240.txt

package info (click to toggle)
snort 2.7.0-20.4
  • links: PTS
  • area: main
  • in suites: lenny
  • size: 34,512 kB
  • ctags: 18,772
  • sloc: ansic: 115,404; sh: 10,893; makefile: 1,372; perl: 487; sql: 213
file content (64 lines) | stat: -rw-r--r-- 1,658 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Rule:

--
Sid:
240

--
Summary:
This event is generated when a DDoS Shaft agent communicates with a Shaft handler.  It is also possible that this event may be generated when any host attempts to discover a Shaft handler.   

--
Impact:
Attempted DDoS. If the listed source IP is in your network, it may be a Shaft agent or a host attempting to discover Shaft handlers.  If the listed destination IP is in your network, it may be a Shaft handler.

--
Detailed Information:
The Shaft DDoS uses a tiered structure of compromised hosts to coordinate and participate in a distributed denial of service attack. Handlers communicate with agents to direct them to launch attacks. An agent may communicate with a handler using a UDP packet to destination port 20433 with a content of "alive".

--
Affected Systems:
Any Shaft compromised host.

--
Attack Scenarios:
A Shaft agent needs to communicate with a handler before it is given directions to launch an attack. 

--
Ease of Attack:
Simple. Shaft code is freely available.

--
False Positives:
None Known.

--
False Negatives:
None Known.

--
Corrective Action:
Perform proper forensic analysis on the suspected compromised host to discover the means of compromise.

Rebuild a confirmed compromised host.

Use a packet-filtering firewall to block inappropriate traffic to the network to prevent hosts from being compromised.


--
Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

--
Additional References:

Arachnids:
http://www.whitehats.com/info/IDS256

Miscellaneous:
http://biocserver.cwru.edu/~jose/shaft_analysis/


--