/
compare.go
409 lines (362 loc) · 11.7 KB
/
compare.go
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package main
import (
"fmt"
"os"
"io"
"log"
"sync"
"flag"
//"bytes"
"strconv"
"strings"
"runtime"
//"io/ioutil"
//"encoding/gob"
"encoding/json"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/util"
)
type KeyPair struct {
bkey, mkey []byte
bmd5, mmd5 string
bsize, msize float64
}
type MetaInfo struct {
Certmd5, Pkgname string
Dexsize int64
Dirs, Files map[string]struct{}
}
var (
Trace, Info, Warning, Error *log.Logger
logfile, bendb, maldb, benmeta, malmeta, output string
threshold float64
//bitmap = make(map[uint]uint)
bitmap [256]uint
benMetaMap map[string]*MetaInfo
malMetaMap map[string]*MetaInfo
)
func Init(errorHandle io.Writer) {
Info = log.New(errorHandle,
"INFO: ",
log.Ldate|log.Ltime|log.Lshortfile)
Error = log.New(errorHandle,
"ERROR: ",
log.Ldate|log.Ltime|log.Lshortfile)
}
func Usage() {
fmt.Println("Fingerprint comparison, get candidate repackaging pairs")
fmt.Println(" Usage: compare -maldb=maldb -bendb=bendb <-threshold=0.8>")
}
func init() {
runtime.GOMAXPROCS(runtime.NumCPU())
flag.StringVar(&bendb, "bendb", "", "db name where benign fingerprints are stored")
flag.StringVar(&maldb, "maldb", "", "db name where malicious fingerprints are stored")
flag.StringVar(&benmeta, "benmeta", "benmeta", "file name where benign meta info are stored")
flag.StringVar(&malmeta, "malmeta", "malmeta", "file name where malicious meta info are stored")
flag.StringVar(&output, "output", "candidate_output.txt", "file name for storing final output")
flag.Float64Var(&threshold, "threshold", 0.85, "similarity threshold")
}
func load(dbname string) map[string]*MetaInfo {
db, _ := leveldb.OpenFile(dbname, nil)
defer db.Close()
var key, value []byte
metamap := make(map[string]*MetaInfo)
iter := db.NewIterator(util.BytesPrefix([]byte("m-")), nil)
for iter.Next() {
key = iter.Key()
//bnumFunc, _ = strconv.ParseFloat(strings.Split(string(bkey[:]), "-")[2], 64)
value = iter.Value()
var minfo MetaInfo
if err := json.Unmarshal(value, &minfo); err != nil {
Error.Println("Unmarshal error", string(key[:]), err)
}
metamap[strings.Split(string(key[:]), "-")[1]] = &minfo
}
defer iter.Release()
return metamap
}
//func load(fname string, e interface{}) {
// n,err := ioutil.ReadFile(fname)
// if err != nil { panic(err) }
//
// p := bytes.NewBuffer(n)
// dec := gob.NewDecoder(p)
//
// err = dec.Decode(e)
// if err != nil { panic(err) }
//}
func bitcount(fhash []byte) uint {
res := uint(0)
for _, b := range fhash {
res += bitmap[b]
}
return res
}
func loadbmap() {
for i := 0; i <= 255; i++ {
bitmap[i] = nb(i)
}
}
func nb(val int) uint {
res := uint(0)
for ; val != 0; {
res += 1
val &= (val - 1)
}
return res
}
func HashCompare(bhash, mhash []byte, bsize, msize float64) float64 {
res := 0.0
for i := 0; i < len(bhash); i ++ {
bindex := bhash[i]&mhash[i]
res += float64(bitmap[bindex])
//res += float64(bitmap[uint(bhash[i]&mhash[i])])
}
return res/bsize //(bsize + msize - res)
}
func SliceCompare(bset, mset []string) float64 {
var res float64
fmap := make(map[string]bool)
if len(bset) <= len(mset) {
for _, b := range bset {
fmap[b] = true
}
for _, m := range mset {
if fmap[m] {
res += 1
}
}
} else {
for _, m := range mset {
fmap[m] = true
}
for _, b := range bset {
if fmap[b] {
res += 1
}
}
}
return res/(float64(len(bset)+len(mset))-res)
}
func MapCompare(bset, mset map[string]struct{}) float64 {
var res float64
if len(bset) <= len(mset) {
for b, _ := range bset {
if _, ok := mset[b]; ok {
res += 1
}
}
} else {
for m, _ := range mset {
if _, ok := bset[m]; ok {
res += 1
}
}
}
return res/(float64(len(bset)+len(mset))-res)
}
func levenshtein(s, t string) int {
d := make([][]int, len(s)+1)
for i := range d {
d[i] = make([]int, len(t)+1)
}
for i := range d {
d[i][0] = i
}
for j := range d[0] {
d[0][j] = j
}
for j := 1; j <= len(t); j++ {
for i := 1; i <= len(s); i++ {
if s[i-1] == t[j-1] {
d[i][j] = d[i-1][j-1]
} else {
min := d[i-1][j]
if d[i][j-1] < min {
min = d[i][j-1]
}
if d[i-1][j-1] < min {
min = d[i-1][j-1]
}
d[i][j] = min + 1
}
}
}
return d[len(s)][len(t)]
}
func MetaCheck(benDB, malDB *leveldb.DB, bmd5, mmd5 string) bool {
beninfo, bok := benMetaMap[bmd5]
malinfo, mok := malMetaMap[mmd5]
if bok && mok {
if beninfo.Certmd5 == malinfo.Certmd5 {
Info.Println("Metainfo: cert filtered", bmd5, mmd5)
return false
} else if beninfo.Dexsize < malinfo.Dexsize*2 && beninfo.Dexsize*2 > malinfo.Dexsize {
Info.Println("Metainfo: dexsize", bmd5, mmd5)
return true
} else if beninfo.Pkgname != "" && malinfo.Pkgname != "" {
if levenshtein(beninfo.Pkgname, malinfo.Pkgname) < 4 {
Info.Println("Metainfo: pkgname", bmd5, mmd5)
return true
}
} else if beninfo.Dirs != nil && malinfo.Dirs != nil {
sim := MapCompare(beninfo.Dirs, malinfo.Dirs)
if sim > 0.5 && sim < 2 {
Info.Println("Metainfo: dirs", bmd5, mmd5)
return true
}
} else if beninfo.Files != nil && malinfo.Files != nil {
sim := MapCompare(beninfo.Files, malinfo.Files)
if sim > 0.5 && sim < 2 {
Info.Println("Metainfo: files", bmd5, mmd5)
return true
}
}
}
var bnumFunc, mnumFunc float64
var bkey, mkey, bvalue, mvalue []byte
var btopPkgs, mtopPkgs []string
beniter := benDB.NewIterator(util.BytesPrefix([]byte("p-"+bmd5)), nil)
for beniter.Next() {
bkey = beniter.Key()
bnumFunc, _ = strconv.ParseFloat(strings.Split(string(bkey[:]), "-")[1], 64)
bvalue = beniter.Value()
if err := json.Unmarshal(bvalue, &btopPkgs); err != nil {
Error.Println("Unmarshal error", bmd5, err)
}
}
defer beniter.Release()
maliter := malDB.NewIterator(util.BytesPrefix([]byte("h-"+mmd5)), nil)
for maliter.Next() {
mkey = maliter.Key()
mnumFunc, _ = strconv.ParseFloat(strings.Split(string(mkey[:]), "-")[1], 64)
mvalue = maliter.Value()
if err := json.Unmarshal(mvalue, &mtopPkgs); err != nil {
Error.Println("Unmarshal error", mmd5, err)
}
}
defer maliter.Release()
if bnumFunc/mnumFunc < 2 && bnumFunc/mnumFunc > 0.5 {
Info.Println("Metainfo: numfunc", bmd5, mmd5)
return true
} else {
sim := SliceCompare(btopPkgs, mtopPkgs)
if sim > 0.5 && sim < 2 {
Info.Println("Metainfo: toppkgs", bmd5, mmd5)
return true
}
}
return false
}
func Worker(benDB, malDB *leveldb.DB, keysChan chan *KeyPair, resChan chan string, wg *sync.WaitGroup) {
// Decreasing internal counter for wait-group as soon as goroutine finishes
defer wg.Done()
var score float64
var bhash, mhash []byte
for keyPair := range keysChan {
// Todo: meta info check
if MetaCheck(benDB, malDB, keyPair.bmd5, keyPair.mmd5) {
bhash, _ = benDB.Get(keyPair.bkey, nil)
mhash, _ = malDB.Get(keyPair.mkey, nil)
if len(bhash) > 0 && len(mhash) > 0 {
score = HashCompare(bhash, mhash, keyPair.bsize, keyPair.msize)
resChan <- fmt.Sprintf("%v, %v, %.3f\n", keyPair.bmd5, keyPair.mmd5, score)
}
}
}
}
func GetPairs(benSize, malSize *map[string]float64, benKeys, malKeys *map[string][]byte, keysChan chan *KeyPair, wg *sync.WaitGroup) {
defer wg.Done()
for bmd5, bsize := range *benSize {
for mmd5, msize := range *malSize {
if threshold < bsize/msize && bsize/msize < 1/threshold {
keysChan <- &KeyPair{(*benKeys)[bmd5], (*malKeys)[mmd5], bmd5, mmd5, bsize, msize}
}
}
}
}
func main() {
//Initialization
flag.Parse()
if bendb == "" || maldb == "" {
Usage()
os.Exit(1)
}
loadbmap()
//load(malmeta, &malMetaMap)
//load(benmeta, &benMetaMap)
malMetaMap = load(malmeta)
benMetaMap = load(benmeta)
logFile, err := os.OpenFile("compare.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
log.Fatalln("Failed to open log file", err)
}
logHandle := io.MultiWriter(logFile, os.Stdout)
Init(logHandle)
Info.Println("Fingerprints comparison start")
outFile, _ := os.Create(output)
defer outFile.Close()
benDB, _ := leveldb.OpenFile(bendb, nil)
defer benDB.Close()
malDB, _ := leveldb.OpenFile(maldb, nil)
defer malDB.Close()
var bKeySplit, mKeySplit []string
var bKey, mKey []byte
var bsize, msize float64
preMalKeys := make(map[string][]byte)
preBenKeys := make(map[string][]byte)
preMalSizes := make(map[string]float64)
preBenSizes := make(map[string]float64)
for i := 3; i <= 20; i ++ {
curMalKeys := make(map[string][]byte)
curBenKeys := make(map[string][]byte)
curMalSizes := make(map[string]float64)
curBenSizes := make(map[string]float64)
beniter := benDB.NewIterator(util.BytesPrefix([]byte("h-"+strconv.Itoa(i))), nil)
for beniter.Next() {
bKey = beniter.Key()
bKeySplit = strings.Split(string(bKey[:]), "-")
bsize, _ = strconv.ParseFloat(bKeySplit[2], 64)
curBenSizes[bKeySplit[3]] = bsize
curBenKeys[bKeySplit[3]] = bKey
}
beniter.Release()
maliter := malDB.NewIterator(util.BytesPrefix([]byte("h-"+strconv.Itoa(i))), nil)
for maliter.Next() {
mKey = maliter.Key()
mKeySplit = strings.Split(string(mKey[:]), "-")
msize, _ = strconv.ParseFloat(mKeySplit[2], 64)
curMalSizes[mKeySplit[3]] = msize
curMalKeys[mKeySplit[3]] = mKey
}
maliter.Release()
wg1 := new(sync.WaitGroup)
wg2 := new(sync.WaitGroup)
keysChan := make(chan *KeyPair, 10000)
resChan := make(chan string, 10000)
// Adding routines to workgroup and running then
for i := 0; i < runtime.NumCPU()-4; i++ {
wg1.Add(1)
go Worker(benDB, malDB, keysChan, resChan, wg1)
}
wg2.Add(3)
go GetPairs(&curBenSizes, &curMalSizes, &curBenKeys, &curMalKeys, keysChan, wg2)
go GetPairs(&preBenSizes, &curMalSizes, &preBenKeys, &curMalKeys, keysChan, wg2)
go GetPairs(&curBenSizes, &preMalSizes, &curBenKeys, &preMalKeys, keysChan, wg2)
go func() {
for result := range resChan {
_, _ = outFile.WriteString(result)
}
}()
wg2.Wait()
close(keysChan)
wg1.Wait()
close(resChan)
outFile.Sync()
preBenSizes = curBenSizes
preMalSizes = curMalSizes
preBenKeys = curBenKeys
preMalKeys = curMalKeys
}
Info.Println("Program end")
}