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...Virus bulletin www virusbtn com technical feature anti unpacker tricks part of variations the attack exist but three tokens are all five that is required rst two can be any format c x etc third token must a s this peter ferrie because vsprintf function calls vprinter microsoft usa and passes zero as fourth parameter accessed by if new unpacking continue to developed used there older ones constantly being defeated series ollydbg plug ins articles see also describes some might become common in future along with supports number packers have been countermeasures written able detect so article will concentrate on debugging created attempt hide from those target debugger these techniques were following description discovered author well vulnerabilities could them speci antianti perhaps most popular user mode hard coded for particular language version debuggers it contains windows xp sp uses constant value service table index ntdll malformed les ntsetinformationthread does not properly suppor...