Well-publicized worms Worm propagation curve Scanning strategies (uniform, permutation, hitlist, subnet) Three factors define worm spread:
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1 Wll-publczd worm Worm propagao curv Scag rag (uorm, prmuao, hl, ub) Thr acor d worm prad: o Sz o vulrabl populao Prvo pach vulrabl, cra hrogy o Ra o co (cag ad propagao ragy) Dploy rwall Drbu worm gaur o Lgh o cou prod Pach vulrabl ar h oubrak Th dpd o vral acor: o Raco m o Coam ragy addr blacklg ad co lrg o Dploym caro whr rpo dployd Evalua c o coam 4 hour ar h o Ir Quara: Rqurm or Coag Sl-Propagag Cod, Procdg o INFOCOM 3, D. Moor, C. Shao, G. Volkr, S. Savag Idalzd dploym: vryo dploy d ar gv prod Idalzd dploym: vryo dploy d ar gv prod
2 Raco m d o b wh mu, o cod W d o u co lrg W d o hav xv dploym o ky po h Ir Moor ougog coco amp o w ho Wh ra xcd 5 pr cod, pu h rmag rqu a quu Wh umbr o rqu a quu xcd op all commucao Implmg ad g a vru hrol, Procdg o Ux Scury Sympoum 3, J. Twycro, M. Wllamo Orgazao har alr ad worm gaur wh hr rd o Svry o alr crad a mor co amp ar dcd o Each ho ha a vry hrhold ar whch dploy rpo Alr prad ju lk worm do o Mu b ar o ovrak worm prad o Ar om m o o w co dco, alr wll b rmovd Cooprav Rpo Srag or Larg-Scal Aack Mgao, Procdg o DISCEX 3, D. Norjr, J. Row, K. Lv A umbr o rd cra, rpo ar Propagag al alarm a problm
3 Early dco would gv m o rac ul h co ha prad Th goal o h papr o dv chqu ha dc w worm a hy ju ar pradg Moorg: o Moor ad collc worm ca rac o Obrvao daa vry oy o w hav o lr w ca rom Old worm ca Por ca by hackg oolk C. C. Zou, W. Gog, D. Towly, ad L. Gao. "Th Moorg ad Early Dco o Ir Worm," IEEE/ACM Traaco o Nworkg. Dco: o Tradoal aomaly dco: hrhold-bad Chck rac bur (hor-rm or log-rm). Dcul: Fal alarm ra o Trd Dco Maur umbr o cd ho ad u o dc worm xpoal growh rd a h bgg Worm uormly ca h Ir o No hl bu ub cag allowd Addr pac cad IPv4 di Smpl pdmc modl: = β * I *( N I ) d Dc worm hr. Should hav xp. prad Provd comprhv obrvao daa o a worm acv or h arly dco o h worm Co o : o Malwar Warg Cr (MWC) o Drbud moor Igr ca moor moor comg rac gog o uud addr Egr ca moor moor ougog rac 3
4 Igr moor collc: o Numbr o ca rcvd a rval o IP addr o cd ho ha hav ca o h moor Egr moor collc: o Avrag worm ca ra Malwar Warg Cr (MWC) moor: o Worm avrag ca ra o Toal umbr o ca moord o Numbr o cd ho obrvd MWC collc ad aggrga rpor rom drbud moor I oal umbr o ca ovr a hrhold or vral cocuv rval, MWC acva h Kalma lr ad bg o h hypoh ha h umbr o cd ho ollow xpoal drbuo Populao: N=36,, Ico ra: α =.8/hour, Sca ra η = 358/m, Ially cd: I = Moord IP pac, Moorg rval: Δ = mu x 5 Icd I Obrvd Icd C c d a m E Ral valu o! Emad valu o! Populao: N=, Sca ra η = 4/c, Ially cd: I = o h Moord IP pac, Moorg rval: Δ = cod d c o # x # o cd ho I a r o c d a m E Ral valu o! Emad valu o! Tm (mu) 5 5 Tm (cod) Tm (cod) Icd ho α mao Icd ho α mao Worm prad vry a (mu, cod) o Nd auomac mgao I h a w worm, o gaur x o Mu apply bhavour-bad aomaly dco o Bu h ha a al-pov problm! W do wa o drop lgma coco! Dyamc quara o Aum guly ul prov oc o Forbd work acc o upcou ho or a hor m o Th gcaly low dow h worm prad C. C. Zou, W. Gog, ad D. Towly. "Worm Propagao Modlg ad Aaly udr Dyamc Quara D," ACM CCS Workhop o Rapd Malcod (WORM'3), Bhavor-bad aomaly dco ca po ou upcou ho o Nd a chqu ha low dow worm prad bu do hur lgma rac much o Aum guly ul prov oc chqu wll brly drop all ougog coco amp (or a pcc rvc) rom a upcou ho o Ar a whl ju aum ha ho halhy, v o prov o o Th hould low dow worm bu cau oly ra rrupo o lgma rac 4
5 Aum w hav om aomaly dco program ha lag a ho a upcou o Quara h ho o Rla ar m T o Th ho may b quarad mulpl m h aomaly dco ra a alarm o Sc h do ac halhy ho oprao a lo w ca hav mor v aomaly dco chqu A cou ho quarad ar m u λ A ucpbl ho ally quarad ar m u λ Quara m T, ar ha w rla h ho A w w cagor: o Quarad cou R() o Quarad ucpbl Q() Ially 75, vulrabl ho Quara ra o cou ho λ =. pr cod o Icou ho wll b quarad ar 5 cod o avrag Quara ra o ucpbl ho pr cod λ =.35 o Thr ar al alarm pr ho pr day T= cod T=c T=3c 5
6 Clag I() Clag R() 6
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