▁button , ▁which ▁sends ▁a ▁chat log ▁to ▁the ▁IM ▁administr ators ▁who ▁can ▁then ▁take ▁action . ▁ ▁P orn ographic ▁IM ▁sp amb ots ▁ ▁Sp am - b ots ▁often ▁sign ▁onto ▁popular ▁mess aging ▁services ▁like ▁K ik ▁or ▁Sk ype ▁to ▁spread ▁por n ographic ▁images . ▁O ften ▁if ▁the ▁user ▁respond s ▁they ▁receive ▁a ▁URL ▁inv iting ▁them ▁to ▁a ▁private ▁liv est ream ▁that ▁will ▁ask ▁them ▁to ▁enter ▁credit ▁card ▁details ▁for ▁" age ▁ver ification ." ▁ ▁These ▁b ots ▁target ▁random ▁us ern ames ; ▁this ▁often ▁results ▁in ▁min ors ▁receiving ▁un sol ic ited ▁por n ographic ▁images . ▁ ▁M essen ger ▁Service ▁sp am ▁on ▁Windows ▁N T - based ▁systems ▁ ▁In ▁ 2 0 0 2 , ▁a ▁number ▁of ▁sp amm ers ▁began ▁ab using ▁the ▁Windows ▁M essen ger ▁service , ▁a ▁function ▁of ▁Windows ▁designed ▁to ▁allow ▁administr ators ▁to ▁send ▁alert s ▁to ▁users ' ▁work st ations ▁( not ▁to ▁be ▁confused ▁with ▁Windows ▁M essen ger ▁or ▁Windows ▁Live ▁M essen ger , ▁a ▁free ▁instant ▁mess aging ▁application ) ▁in ▁Microsoft ' s ▁Windows ▁N T - based ▁operating ▁systems . ▁M essen ger ▁Service ▁sp am ▁appears ▁as ▁normal ▁dialog ▁boxes ▁containing ▁the ▁sp ammer ' s ▁message . ▁These ▁messages ▁are ▁easily ▁blocked ▁by ▁fire w alls ▁configured ▁to ▁block ▁packets ▁to ▁the ▁Net BI OS ▁ports ▁ 1 3 5 - 1 3 9 ▁and