Trend Micro Anti Virus Runs Malware if its called cmd.exe or regedit.exe

Trend Micro Anti Virus Runs Malware if its called cmd.exe or regedit.exe

Trend Micro Anti Virus Runs Malware if its called cmd.exe or regedit.exe: Bug hunter “hyp3rlinx” has recently discovered an arbitrary code execution vulnerability in Trend Micro’s Anti-Threat Toolkit (ATTK). CVE-2019-9491 effects versions and below of Trend Micro’s Anti-Threat Toolkit (ATTK). The vulnerability works by tricking Trend Micro Anti-Threat Toolkit into running any .exe file as long as its naming scheme is either cmd.exe or regedit.exe Trend Micro’s Anti-Threat Toolkit will run it. Let’s assume that a malware author was to name there malware under the file name cmd.exe or regedit.exe when the target was to scan their system using Trend Micro’s Anti-Threat Toolkit (ATTK) software the anti-virus would be tricked into unknowingly running malicious code. Trend Micro signs all its software and its software tends to be trusted across anti-virus software and end users. Every time ATTK (Anti-Threat Toolkit) runs on the target system it can be exploited unknowingly to the user.

Proof of concept (PoC)

CVE-2019-9491 Description:

Trend Micro Anti-Threat Toolkit (ATTK) versions and below have a vulnerability that may allow an attacker to place malicious files in the same directory, potentially leading to arbitrary remote code execution (RCE) when executed.

Sources:  MITRE

[+] Credits: John Page (aka hyp3rlinx)		
[+] Website:
[+] Source:
[+] ISR: Apparition Security          


Trend Micro Anti-Threat Toolkit (ATTK) 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

[Vulnerability Type]
Remote Code Execution

[CVE Reference]

[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.)

Hash: e8503e9897fd56eac0ce3c3f6db24fb1

Hash: 798039027bb4363dcfd264c14267375f

Hash: f1d2ca4b14368911c767873cdbc194ed

*All versions of the ATTK have been updated with the newer version. Anti-Threat Toolkit (ATTK)

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");
   WinExec("powershell", 0);

[POC Video URL]

[Network Access]


[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
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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).