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* The "Nazgul" Attack tool: Cost Analysis *
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By G. Lamastra, P. Abeni, D. Sestito, E. Caprella
F. Frosali, F. Coda Zabetta, G. Cangini
Be-Secure, Telecom Italia Labs
May 5th, 2002
This note is aimed at giving an estimate of the costs suffered as
a consequence of the attacks.
We did the following hypothesis, which holds in our specific situation:
- We imagined a standard server compromise; our server is used for providing
two web applications, which are used by 24 different users.
On the average (data collected from access logs), 10 users/day use one
of the two application; the average interaction time is 20 minutes.
- The server has been taken off-line for two days; the cost for the
downtime is estimated to be: 10 * 20min * 2days = 400 min = 6.6 hours
of lost time activity; we round up this value to a single man/day
We estimated that the binary was immediately discovered, and we did not
performed any deep forensic analysis; the binary was saved, and the
system reinstalled.
This is coherent with the policy planned for the server in case of
incidents; again, we recall that the server does not host any critical
application.
- Full reinstall of the operating system and web applications takes two
days of system administator activity
- The complete process of reverse-engineering the binary, broken by
person/group is detailed in the following scheme:
Paolo: 10 days \
Dario: 7 days - The Reverse Engineering Team: 16 man*days
Ettore: 5 days /
Federico: 2 days \
Gianluca: 2 days - To setup the tests and write the client: 6 man*days
Francesco: 2 days /
Gerardo: 3 days - Coordination, tests, and documents production
Overhead: 1 day - Meeting, discussion, coffee time
Reverse Challenge Total Effort: 32 man*days
Duration: 13 days (5/16/02 .. 5/29/02)
- Total cost: 35 man/days (including downtime & reinstalling);
Assuming 70.000$/yr as requested, assuming 200 working days a year
(Italy standards), we have an estimate of 350$/(man*day).
Hence, the total is 35*350$ = 12.250$.