#Hwp file viewer online update#
#Hwp file viewer online software#

#Hwp file viewer online update#

We will update this blog entry once we get more details about the said vulnerability. It also blocks the related message and prevents it from even reaching users' inboxes. Trend Micro protects users from this threat via Trend Micro™ Smart Protection Network™ that detects and deletes the related malware. However, we must stay vigilant, as this is not the last time we'll be seeing threats of this kind. Fortunately in this case, proper mitigation steps were executed immediately. A successful compromise to an organization not only puts their customers at risk, but also easily tarnishes their reputation. This highlights the importance of security, specially for organizations whose services include storing customer information. In this case the Word Processor vendor, who adopted a specific third-party module that may have contained the vulnerability, needs to pay attention to industry’s CVE information too and get ready to update.

#Hwp file viewer online software#

Both incidents prove that using regional software does not guarantee absence of malware attacks. Successfully exploiting these lead to the installation of a backdoor. We previously reported a case wherein malicious users abused vulnerabilities found in the Japanese-language word processor Ichitaro. Hancom Office is also not the first of its kind to be exploited by attackers. With this incident, we may be seeing attackers gradually taking advantage of vulnerabilities in local-based applications. HWP is the Korean government’s de facto standard wordprocessor format, what we may be seeing now is a reconnaissance phase of a future, larger, regional attack. This decoy document contains the following Korean text:Ī Recon for Future Attacks Judging from the profile of the target company, a successful infection may lead to mass pilfering of personal data of their customers. HWP document in order to prevent the user from suspecting any malicious activity. The backdoor also downloads and executes other malicious files, leaving the compromised system susceptible to further infection and data theft.Īfter execution, TROJ_MDROP.ZD replaces itself with a non-malicious.

Based on our analysis, BKDR_VISEL.FO also terminates processes related to specific antivirus programs, making its detection and removal difficult. This backdoor gives remote access to a potential attacker, who may perform malicious routines on the infected machine. Upon opening the malicious attachment, TROJ_MDROP.ZD exploits a still unidentified vulnerability in order to drop and execute the backdoor BKDR_VISEL.FO in the background. The email was sent to numerous employees of a prominent Korean company. HWP is a popular Korean word processor file format – just the right format for targeting Korean prospective victims, which might be the case here.ĭetected as TROJ_MDROP.ZD, this specially crafted document arrived as an attachment of an email, which used a recent murder case in Korea as social engineering ploy.

A few weeks ago, we have been alerted by our colleagues from Korea to a specially crafted Hangul Word Processor document (.hwp) that exploits an application vulnerability in the Hancom Office word processing software.