Researchers Expose Phishing Threats Distributing CountLoader and PureRAT

A new campaign has been observed impersonating Ukrainian government agencies in phishing attacks to deliver CountLoader , which is then used to drop Amatera Stealer and PureMiner. "The phishing emails contain malicious Scalable Vector Graphics SVG files designed to trick recipients into opening...

Ukrainian Military Targeted in Phishing Campaign Leveraging Drone Manuals

Ukrainian military entities are the target of a phishing campaign that leverages drone manuals as lures to deliver a Go-based open-source post-exploitation toolkit called Merlin. "Since drones or Unmanned Aerial Vehicles UAVs have been an integral tool used by the Ukrainian military, malware-lace...

ScarCruft's Evolving Arsenal: Researchers Reveal New Malware Distribution Techniques

The North Korean advanced persistent threat APT actor dubbed ScarCruft is using weaponized Microsoft Compiled HTML Help CHM files to download additional malware onto targeted machines. According to multiple reports from AhnLab Security Emergency response Center ASEC, SEKOIA.IO, and Zscaler, the...

USN-5423-1 clamav vulnerabilities

Michał Dardas discovered that ClamAV incorrectly handled parsing CHM files. A remote attacker could possibly use this issue to cause ClamAV to stop responding, resulting in a denial of service. CVE-2022-20770 Michał Dardas discovered that ClamAV incorrectly handled parsing TIFF files. A remote...

Microsoft Compiled HTML Help / Uncompiled .chm File - XML External Entity Injection

Credits: John Page aka hyp3rlinx + Website: hyp3rlinx.altervista.org + Source: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-WINDOWS-HTML-HELP-UNCOMPILED-CHM-FILE-XML-EXTERNAL-ENTITY-INJECTION.txt + ISR: ApparitionSec Vendor www.microsoft.com Product Microsoft Compiled HTML Help "hh.exe"...

ALPINE-CVE-2018-18586

chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against absolute/relative pathnames in CHM files, leading to Directory Traversal. NOTE: the vendor disputes that this is a libmspack vulnerability, because chmextract.c was only intended...

libmspack Buffer Overflow Vulnerability

Libmspack is a library that can compress and decompress files in CAB, CHM and HLP formats. A security vulnerability exists in the 'chmdreadheaders' function in the mspack/chmd.c file in versions of Libmspack prior to 0.8alpha. No details of the vulnerability are provided at this time...

USN-3728-1 libmspack vulnerabilities

Hanno Böck discovered that libmspack incorrectly handled certain CHM files. An attacker could possibly use this issue to cause a denial of service. CVE-2018-14679, CVE-2018-14680 Jakub Wilk discovered that libmspack incorrectly handled certain KWAJ files. An attacker could possibly use this issue...

Apache Tika Chmparser Denial Of Service (CVE-2018-1339)

A denial-of-service vulnerability exists in Apache Tika. The vulnerability is due to improper handling of a Microsoft Compiled HTML Help file during enumerating its listing chunks...

CHM Help Files Deliver Brazilian Banking Trojan

Security researchers are warning of a new spam campaign targeting Brazilian institutions that contain Compiled HTML file attachments that are used to deliver a banking Trojan. Spam messages contain a malicious CHM attachment called “comprovante.chm”, wrote Rodel Mendrez, senior security researche...

USN-3393-1 clamav vulnerabilities

It was discovered that ClamAV incorrectly handled parsing certain e-mail messages. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. CVE-2017-6418 It was discovered that ClamAV incorrectly handled certain malformed CHM files. A remote...

Microsoft Compiled HTML Help Remote Code Execution

!/usr/bin/php pocEhsan Noreddini shot : http://ehsann.info/proof/MicrosoftCompiledHTMLhelpRCE.png Original Code : http://ehsann.info/exploit/5.txt video : http://ehsann.info/video/MicrosoftCompiledHTMLhelpRCE.mp4 print "Microsoft Compiled HTML Help - Remote Code Execution Exploit \r\n"; $port=80;...

DEBIAN-CVE-2012-1458

The Microsoft CHM file parser in ClamAV 0.96.4 and Sophos Anti-Virus 4.61.0 allows remote attackers to bypass malware detection via a crafted reset interval in the LZXC header of a CHM file. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the...

CVE-2012-1458

The Microsoft CHM file parser in ClamAV 0.96.4 and Sophos Anti-Virus 4.61.0 allows remote attackers to bypass malware detection via a crafted reset interval in the LZXC header of a CHM file. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the...

Microsoft HTML Help Compiler (hhc.exe) - Buffer Overflow (PoC)

Microsoft HTML Help Compiler hhc.exe - Buffer Overflow PoC Microsoft’s HTML Help Compiler hhc.exe is free tool to build Microsoft Compiled HTML Help .chm files. It is included within HTML Help Workshop and Visual Studio. The executable, hhc.exe, does not properly check the length of user-supplied...

DEBIAN-CVE-2007-1997

Integer signedness error in the 1 cabunstore and 2 cabextract functions in libclamav/cab.c in Clam AntiVirus ClamAV before 0.90.2 allow remote attackers to execute arbitrary code via a crafted CHM file that contains a negative integer, which passes a signed comparison and leads to a stack-based...

DEBIAN-CVE-2005-2930

Stack-based buffer overflow in the chmfindinPMGL function in chmlib.c for chmlib before 0.36, as used in products such as KchmViewer, allows user-assisted attackers to execute arbitrary code via a CHM file containing a long element, a different vulnerability than CVE-2005-3318...