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Find class instances

 
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Dark Byte
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Joined: 09 May 2003
Posts: 25669
Location: The netherlands
PostPosted: Wed Mar 18, 2020 3:11 pm    Post subject: Find class instances This post has 1 review(s) Reply with quote
This code will help you find class instances based on visual studio classnames
Code:

s=createMemScan()

s.firstScan(soExactValue, vtString, rtRounded, '.?AV', '', getAddress(process) ,getAddress(process)+getAddress(getModuleSize(process)) ,"*W*X*C" ,fsmNotAligned ,'1' ,false ,true, false, true);
s.waitTillDone()

fl=createFoundList(s)

names={}
fl.initialize()

sll=createStringList()
for i=1,fl.Count do
  local a=tonumber(fl[i-1],16)
  names[i]={}
  names[i].name=readString(tonumber(fl[i-1],16)+4)
  names[i].address=a-0x10
  sll.add(names[i].name)
end

r,selstring=showSelectionList('RTTI Classes','Select the class to find instances of',sll)
if (r==-1) then return end
sll.destroy()

print("You picked "..selstring)
a=names[r+1].address
if targetIs64Bit() then
  a=a-getAddress(process)
end

fl.deinitialize()
--print(string.format("Scanning for %x", a))
s.firstScan(soExactValue, vtDword, rtRounded, string.format("%x",a), '', getAddress(process) ,getAddress(process)+getAddress(getModuleSize(process)) ,"*W*X*C" ,fsmNotAligned ,'1' ,true ,true, false, true);
s.waitTillDone()
fl.initialize()
--print("found "..fl.Count.." results")

RTTIInfo={}
for i=1,fl.Count do
  local a=tonumber(fl[i-1],16)
  a=a-12
  if readBytes(a,1)==1 then
    table.insert(RTTIInfo,a)
  end
end

--print("after checking only "..#RTTIInfo.." left")

if targetIs64Bit() then
  scantype=vtQword
  pointersize=8
else
  scantype=vtDword
  pointersize=4
end

vtables={}

for i=1,#RTTIInfo do
  a=RTTIInfo[i]
  fl.deinitialize()
  --print(string.format("Scanning for %x", a))
  s.firstScan(soExactValue, scantype, rtRounded, string.format("%x",a), '', getAddress(process) ,getAddress(process)+getAddress(getModuleSize(process)) ,"*W*X*C" ,fsmNotAligned ,'1' ,true ,true, false, true);
  s.waitTillDone()
  fl.initialize()

  for j=1,fl.Count do
    table.insert(vtables, tonumber(fl[j-1],16)+pointersize)
  end
end

--print(#vtables.." vtables found")

--scan instances

instances={}

for i=1,#vtables do
  a=vtables[i]
  fl.deinitialize()
  print(string.format("Scanning for %x", a))
  s.firstScan(soExactValue, scantype, rtRounded, string.format("%x",a), '', 0 ,0xffffffffffffffff ,"*W*X*C" ,fsmNotAligned ,'1' ,true ,true, false, true);
  s.waitTillDone()
  fl.initialize()

  for j=1,fl.Count do
    table.insert(instances, tonumber(fl[j-1],16))
  end
end

print("The following instances of the class "..selstring.." where found")
for i=1,#instances do
  print(string.format("%x",instances[i]))
end

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Dark Byte
Site Admin
Reputation: 467

Joined: 09 May 2003
Posts: 25669
Location: The netherlands
PostPosted: Thu Feb 22, 2024 5:07 pm    Post subject: Reply with quote
updated version that also scans other modules (slower at start)
Code:

s=createMemScan()

s.firstScan(soExactValue, vtString, rtRounded, '.?AV', '', 0 ,0xffffffffffffffff ,"*W*X*C" ,fsmNotAligned ,'1' ,false ,true, false, true);
s.waitTillDone()

fl=createFoundList(s)

names={}
fl.initialize()

printf("fl.count=%d",fl.count)

sll=createStringList()
for i=1,fl.Count do
  local a=tonumber(fl[i-1],16)

  if inModule(a) then
    --figure out which module
    local as=getNameFromAddress(a,true,false,false)
    local moduleend=1
    while true do
      local newend=as:find('%+',moduleend+1)
      if newend==nil then break end
      moduleend=newend
    end

    as=as:sub(1,moduleend-1)
    local ne={}
    ne={}
    ne.name=readString(tonumber(fl[i-1],16)+4)
    ne.address=a-0x10
    ne.modulename=as:sub(1,moduleend-1)
    ne.modulebase=getAddress(ne.modulename)
    ne.moduleend=ne.modulebase+getModuleSize(ne.modulename)
    table.insert(names,ne)
    sll.add(ne.name)
  end
end

r,selstring=showSelectionList('RTTI Classes','Select the class to find instances of',sll)
if (r==-1) then return end
sll.destroy()

printf("You picked %d: %s in module %s (%x-%x)", r+1,selstring, names[r+1].modulename,names[r+1].modulebase,names[r+1].moduleend)
mstart=names[r+1].modulebase
mstop=names[r+1].moduleend

a=names[r+1].address
if targetIs64Bit() then
  a=a-mstart
end



fl.deinitialize()
--print(string.format("Scanning for %x", a))
s.newScan()
s.firstScan(soExactValue, vtDword, rtRounded, string.format("%x",a), '', mstart ,mstop ,"*W*X*C" ,fsmNotAligned ,'1' ,true ,true, false, true);
s.waitTillDone()
fl.initialize()
--print("found "..fl.Count.." results")

RTTIInfo={}
for i=1,fl.Count do
  local a=tonumber(fl[i-1],16)
  a=a-12
  if readBytes(a,1)==1 then
    table.insert(RTTIInfo,a)
  end
end

--print("after checking only "..#RTTIInfo.." left")

if targetIs64Bit() then
  scantype=vtQword
  pointersize=8
else
  scantype=vtDword
  pointersize=4
end

vtables={}

for i=1,#RTTIInfo do
  a=RTTIInfo[i]
  fl.deinitialize()
  --print(string.format("Scanning for %x", a))
  s.newScan()
  s.firstScan(soExactValue, scantype, rtRounded, string.format("%x",a), '', mstart ,mstop ,"*W*X*C" ,fsmNotAligned ,'1' ,true ,true, false, true);
  s.waitTillDone()
  fl.initialize()

  for j=1,fl.Count do
    table.insert(vtables, tonumber(fl[j-1],16)+pointersize)
  end
end

--print(#vtables.." vtables found")

--scan instances

instances={}

for i=1,#vtables do
  a=vtables[i]
  fl.deinitialize()
  print(string.format("Scanning for %x", a))
  s.newScan()
  s.firstScan(soExactValue, scantype, rtRounded, string.format("%x",a), '', 0 ,0xffffffffffffffff ,"*W*X*C" ,fsmNotAligned ,'1' ,true ,true, false, true);
  s.waitTillDone()
  fl.initialize()

  for j=1,fl.Count do
    table.insert(instances, tonumber(fl[j-1],16))
  end
end

print("The following instances of the class "..selstring.." where found")
for i=1,#instances do
  print(string.format("%x",instances[i]))
end



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