scusi revidoval tento gist 10 months ago. Přejít na revizi
Žádné změny
scusi revidoval tento gist 10 months ago. Přejít na revizi
Žádné změny
Florian Walther revidoval tento gist 11 years ago. Přejít na revizi
1 file changed, 1 insertion, 6 deletions
dns_xor.go
| @@ -2,6 +2,7 @@ | |||
| 2 | 2 | // as described on: | |
| 3 | 3 | // https://blog.gdata.de/artikel/neue-variante-von-frameworkpos-schoepft-daten-ueber-dns-anfragen-ab/ | |
| 4 | 4 | // | |
| 5 | + | ||
| 5 | 6 | package main | |
| 6 | 7 | ||
| 7 | 8 | import( | |
| @@ -11,12 +12,6 @@ import( | |||
| 11 | 12 | "flag" | |
| 12 | 13 | ) | |
| 13 | 14 | ||
| 14 | - | // test vectors: | |
| 15 | - | // data := []byte{0xc3, 0xcb, 0xc0, 0xdc, 0xc3, 0xc4, 0xca, 0xdc, 0xc4, 0xcb, 0xdc, 0xc4, 0xcb} | |
| 16 | - | // string := "192.168.69.69" | |
| 17 | - | // | |
| 18 | - | // data := []byte{0xa2, 0xb3, 0xa7, 0xbe, 0xdf, 0xb3, 0xb0, 0xb1, 0xc3, 0xc0, 0xc1, 0xc6} | |
| 19 | - | // string := "PAUL-ABC1234" | |
| 20 | 15 | const A = 0xAA | |
| 21 | 16 | const B = 0x9B | |
| 22 | 17 | const C = 0xC3 | |
Florian Walther revidoval tento gist 11 years ago. Přejít na revizi
1 file changed, 71 insertions
dns_xor.go(vytvořil soubor)
| @@ -0,0 +1,71 @@ | |||
| 1 | + | // domain data encoding/decoding algo for FrameworkPOS Malware DNS-Tunneling Variant, | |
| 2 | + | // as described on: | |
| 3 | + | // https://blog.gdata.de/artikel/neue-variante-von-frameworkpos-schoepft-daten-ueber-dns-anfragen-ab/ | |
| 4 | + | // | |
| 5 | + | package main | |
| 6 | + | ||
| 7 | + | import( | |
| 8 | + | "fmt" | |
| 9 | + | "os" | |
| 10 | + | "encoding/hex" | |
| 11 | + | "flag" | |
| 12 | + | ) | |
| 13 | + | ||
| 14 | + | // test vectors: | |
| 15 | + | // data := []byte{0xc3, 0xcb, 0xc0, 0xdc, 0xc3, 0xc4, 0xca, 0xdc, 0xc4, 0xcb, 0xdc, 0xc4, 0xcb} | |
| 16 | + | // string := "192.168.69.69" | |
| 17 | + | // | |
| 18 | + | // data := []byte{0xa2, 0xb3, 0xa7, 0xbe, 0xdf, 0xb3, 0xb0, 0xb1, 0xc3, 0xc0, 0xc1, 0xc6} | |
| 19 | + | // string := "PAUL-ABC1234" | |
| 20 | + | const A = 0xAA | |
| 21 | + | const B = 0x9B | |
| 22 | + | const C = 0xC3 | |
| 23 | + | ||
| 24 | + | var op string | |
| 25 | + | var in string | |
| 26 | + | ||
| 27 | + | func init(){ | |
| 28 | + | flag.StringVar(&op, "op", "decode", "operation to perform: 'encode' or 'decode', default is 'decode'") | |
| 29 | + | flag.StringVar(&in, "in", "", "Inputstring to perform choosen operation on") | |
| 30 | + | } | |
| 31 | + | ||
| 32 | + | // decode - decodes single values from dns queries into cleartext | |
| 33 | + | func decode(data []byte)(result []byte){ | |
| 34 | + | for _, v := range data { | |
| 35 | + | a := v ^ A | |
| 36 | + | b := a ^ B | |
| 37 | + | result = append(result, b ^ C) | |
| 38 | + | } | |
| 39 | + | return result | |
| 40 | + | } | |
| 41 | + | ||
| 42 | + | // encode - encodes cleartext values to be used in dns queries | |
| 43 | + | func encode(data []byte)(result []byte) { | |
| 44 | + | for _, v := range data { | |
| 45 | + | b := v ^ C | |
| 46 | + | a := b ^ B | |
| 47 | + | result = append(result, a ^ A) | |
| 48 | + | } | |
| 49 | + | return result | |
| 50 | + | } | |
| 51 | + | ||
| 52 | + | func main(){ | |
| 53 | + | flag.Parse() | |
| 54 | + | input := []byte(in) | |
| 55 | + | ||
| 56 | + | switch { | |
| 57 | + | case op == "encode": | |
| 58 | + | encoded := encode(input) | |
| 59 | + | fmt.Printf("%s %x\n", input, string(encoded)) | |
| 60 | + | case op == "decode": | |
| 61 | + | data, err := hex.DecodeString(string(input)) | |
| 62 | + | if err != nil { | |
| 63 | + | panic(err) | |
| 64 | + | } | |
| 65 | + | decoded := decode(data) | |
| 66 | + | fmt.Printf("%x %s\n", data, string(decoded)) | |
| 67 | + | default: | |
| 68 | + | prog := os.Args[0] | |
| 69 | + | fmt.Printf("For USAGE INFO call: '%s -h'\n", prog) | |
| 70 | + | } | |
| 71 | + | } | |
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