scusi ревизій цього gist 10 months ago. До ревизії
Без змін
scusi ревизій цього gist 10 months ago. До ревизії
Без змін
Florian Walther ревизій цього gist 11 years ago. До ревизії
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 ревизій цього gist 11 years ago. До ревизії
1 file changed, 71 insertions
dns_xor.go(файл створено)
| @@ -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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