[![Logo](https://www.paloaltonetworks.com/wp-content/uploads/2021/07/PANW_Parent.png)](https://www.paloaltonetworks.com/) [![Unit42 Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/unit42-logo-white.svg)](https://unit42.paloaltonetworks.com/) Menu * [Tools](https://unit42.paloaltonetworks.com/tools/) * [ATOMs](https://unit42.paloaltonetworks.com/atoms/) * [Security Consulting](https://www.paloaltonetworks.com/unit42) * [About Us](https://unit42.paloaltonetworks.com/about-unit-42/) * [**Under Attack?**](https://start.paloaltonetworks.com/contact-unit42.html) * [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/ "Threat Research") * [Malware](https://unit42.paloaltonetworks.com/category/malware/ "Malware") [Malware](https://unit42.paloaltonetworks.com/category/malware/) # The Blockbuster Saga Continues ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 3 min read Related Products [![Advanced Threat Prevention icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced Threat Prevention](https://unit42.paloaltonetworks.com/product-category/advanced-threat-prevention/ "Advanced Threat Prevention")[![Advanced WildFire icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/strata_RGB_logo_Icon_Color.png)Advanced WildFire](https://unit42.paloaltonetworks.com/product-category/advanced-wildfire/ "Advanced WildFire") * ![Profile Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-profile-grey.svg) By: * [Anthony Kasza](https://unit42.paloaltonetworks.com/author/anthony-kasza/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:August 14, 2017 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Malware](https://unit42.paloaltonetworks.com/category/malware/) * [Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-tags-grey.svg) Tags: * [Blockbuster](https://unit42.paloaltonetworks.com/tag/blockbuster/) * [Korea](https://unit42.paloaltonetworks.com/tag/korea/) * [Lazarus Group](https://unit42.paloaltonetworks.com/tag/lazarus-group/) * [Spear Phishing](https://unit42.paloaltonetworks.com/tag/spear-phishing/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/unit42-blockbuster-saga-continues/?pdf=download&lg=en&_wpnonce=40dbae5d0f "Click here to download") * [![Print Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-print.svg)](https://unit42.paloaltonetworks.com/unit42-blockbuster-saga-continues/?pdf=print&lg=en&_wpnonce=40dbae5d0f "Click here to print") Share![Down arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/down-arrow.svg) * ![Link Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-share-link.svg) * [![Link Email](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-sms.svg)](mailto:?subject=The%20Blockbuster%20Saga%20Continues&body=Check%20out%20this%20article%20https%3A%2F%2Funit42.paloaltonetworks.com%2Funit42-blockbuster-saga-continues%2F "Share in email") * [![Facebook 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Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-reddit-share.svg)](https://www.paloaltonetworks.com//www.reddit.com/submit?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Funit42-blockbuster-saga-continues%2F&ts=markdown "Share in Reddit") * [![Mastodon Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-mastodon-share.svg)](https://mastodon.social/share?text=The%20Blockbuster%20Saga%20Continues%20https%3A%2F%2Funit42.paloaltonetworks.com%2Funit42-blockbuster-saga-continues%2F "Share in Mastodon") Unit 42 researchers at Palo Alto Networks have discovered new attack activity targeting individuals involved with United States defense contractors. Through analysis of malicious code, files, and infrastructure it is clear the group behind this campaign is either directly responsible for or has cooperated with the group which conducted [Operation Blockbuster Sequel](https://blog.paloaltonetworks.com/2017/04/unit42-the-blockbuster-sequel/) and, ultimately, [Operation Blockbuster](https://www.operationblockbuster.com/wp-content/uploads/2016/02/Operation-Blockbuster-Report.pdf) (originally outlined by researchers from Novetta). The threat actors are reusing tools, techniques, and procedures which overlap throughout these operations with little variance. Attacks originating from this threat group have not ceased since our previous report (from April of 2017) and have continued through July of 2017. ### New Activity Recently, we've identified weaponized Microsoft Office Document files which use the same malicious macros as attacks from earlier this year. Based on the contents of these latest decoy documents which are displayed to a victim after opening the weaponized document the attackers have switched targets from Korean language speakers to English language speakers. Most notably, decoy document themes now include job role descriptions and internal policies from US defense contractors. The following image shows the content of one of the recent decoy documents (de2d458c8e4befcd478a0010789d80997793790b18a347d10a595d6e87d91f34). It is a job description at a defense contractor. ![Blockbuster\_1](https://unit42.paloaltonetworks.com/wp-content/uploads/2017/08/Blockbuster_1.png) The following images also shows the contents of a recent decoy document (062aadf3eb69686f4881860d88ce472e6b1c07e1f586d840dd2ee1f7b76cabe7). It contains an exact copy of a publicly available job description, including typos, at a US defense contractor. ![Blockbuster\_2](https://unit42.paloaltonetworks.com/wp-content/uploads/2017/08/Blockbuster_2.png) The weaponized documents have been hosted on systems which we believe have likely been compromised and repurposed. Two of the URL paths used to host the weaponized documents on the compromised systems are exact matches (event/careers/jobs/description/docs). The payloads delivered by the weaponized documents are extremely similar to the payloads delivered by weaponized documents detailed in our April 2017 [report](https://blog.paloaltonetworks.com/2017/04/unit42-the-blockbuster-sequel/) on the threat group's activity. For a more comprehensive understanding of the relationships between samples and infrastructure used in the recent activity see the following network graph. [![blockbuster saga](https://unit42.paloaltonetworks.com/wp-content/uploads/2017/08/blockbuster-saga.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2017/08/blockbuster-saga.png) The document metadata Author "ISkyISea" is used across multiple weaponized document files. IPv4 addresses (210.202.40\[.\]35) hosting the weaponized documents have also been hardcoded as command and control servers for previous samples (16c3a7f143e831dd0481d2d57aae885090e22ec55cc8282009f641755d423fcd). ### Ties to Blockbuster The source code used in the macros embedded in the weaponized documents described above was also detailed in a previous [report](https://blog.paloaltonetworks.com/2017/04/unit42-the-blockbuster-sequel/) where it was included in testing documents uploaded to VirusTotal. This reuse of macro source code, XOR keys used within the macro to decode implant payloads, and the functional overlap in the payloads the macros write to disk demonstrates the continued use of this tool set by this threat group. The use of an automated tool to build the weaponized documents would explain the common but not consistent reuse of metadata, payloads, and XOR keys within the documents. Other similarities between the previously reported activity and this new activity can be seen within the PE payloads written to disk by the malicious documents. The payloads function similarly to other implants associated with this threat group. The use of a fake TLS communications protocol, encoded strings within samples, filenames and contents of batch files embedded within implants, as well implants beaconing directly to IPv4 addresses (and not resolving domains for command and control) are all known techniques associated with the threat group. These tactics have changed very little since the original Operation Blockbuster. In addition to tool reuse, infrastructure overlaps also exist. URLs used for hosting the malicious documents and IPv4 addresses used for command and control overlap with infrastructure previously used by the group. ### Final Thoughts The techniques and tactics the group uses have changed little in recent attacks. Tool and infrastructure overlaps with previous campaigns are apparent. Given that the threat actors have continued operations despite their discovery and public exposure it is likely they will continue to operate and launch targeted campaigns. Palo Alto Networks researchers will continue to monitor this group's activities and stay abreast to additional attacks using this tool set. * The malicious files describe in this report are flagged as malicious by WildFire and in Threat Prevention. * AutoFocus users can learn more about the threat group and their indicators by examining the [BlockBuster\_Sequel tag](https://autofocus.paloaltonetworks.com/). ### Indicators of Compromise **SHA256** 4d4465bd9a57c7a3c0b80fa3282697554a1419794afa36e544a4ae06d60c1615 f390ef86a4ad92dde125c983e6470f08344b9eaa14c17a1e6c4bb7ebfa7c4ec9 acfae7e2fdda02e81b3e03f8c30741744d629cd672db424027f7caa59c975897 7429a6b6e8518a1ec1d1c37a8786359885f2fd4abde560adaef331ca9deaeefd e09224a24a14a08c6fcb79b00b4a7b3097c84f805f5f2adefe2f7d04d7b4a8ee 062aadf3eb69686f4881860d88ce472e6b1c07e1f586d840dd2ee1f7b76cabe7 c63a415d23fc4ab10ad3acfdd47d42b5c7444604485ab45147277cca82fffb34 16c3a7f143e831dd0481d2d57aae885090e22ec55cc8282009f641755d423fcd de2d458c8e4befcd478a0010789d80997793790b18a347d10a595d6e87d91f34 2f133525f76ab0ebb0b370601673361253074c337f0b0895d0f0cb5bc261cfcb e83a08bcb4353bfd6edcdedbc9ead9ab179a620e15155b60d18153bed9892f38 6f673981892701d42159489c1b2614c098a04e4674b23e1cd0fd8911766e71a0 ad075279d2ee6958105889d852e0d7f4266f746cb0078ac1b362f05a45b5828d 1288e105c83a6f4bbad8471a9b5bedafeea684a8d8b73a1a7518137d446c2e1e **IPv4** 104\.192.193\[.\]149 176\.35.250\[.\]93 213\.152.51\[.\]169 108\.222.149\[.\]173 197\.246.6\[.\]83 118\.140.97\[.\]6 210\.202.40\[.\]35 59\.90.93\[.\]97 107\.6.12\[.\]135 **URLs** http://210.202.40\[.\]35/CKRQST/event/careers/jobs/description/docs/NGC1398.doc http://210.202.40\[.\]35/CKRQST/Company/HR/Position/lm/L1915.doc http://104.192.193\[.\]149/Event/careers/jobs/description/docs/LJC077.doc http://lansingturbo\[.\]org/docs/WebDAV.exe Back to top ### Tags * [Blockbuster](https://unit42.paloaltonetworks.com/tag/blockbuster/ "Blockbuster") * [Korea](https://unit42.paloaltonetworks.com/tag/korea/ "Korea") * [Lazarus Group](https://unit42.paloaltonetworks.com/tag/lazarus-group/ "Lazarus Group") * [Spear Phishing](https://unit42.paloaltonetworks.com/tag/spear-phishing/ "Spear Phishing") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: Microsoft Honors 5 Unit 42 Researchers for Vulnerability Research](https://unit42.paloaltonetworks.com/unit42-microsoft-honors-5-unit-42-researchers-vulnerability-research/ "Microsoft Honors 5 Unit 42 Researchers for Vulnerability Research") ### Related Articles * [Threat Brief: Recruiting Scheme Impersonating Palo Alto Networks Talent Acquisition Team](https://unit42.paloaltonetworks.com/phishing-attackers-pose-as-panw-recruiters/ "article - table of contents") * [Boggy Serpens Threat Assessment](https://unit42.paloaltonetworks.com/boggy-serpens-threat-assessment/ "article - table of contents") * [Recent Jailbreaks Demonstrate Emerging Threat to DeepSeek](https://unit42.paloaltonetworks.com/jailbreaking-deepseek-three-techniques/ "article - table of contents") ## Related Malware Resources ![Pictorial representation of post-exploitation identity misuse in SPIFFE/SPIRE. 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A close-up of a computer circuit board with a central microchip is depicted. Red digital data streams in the form of glowing binary numbers and arrows appear to flow in and out of the chip, symbolizing data processing and transfer. 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A digital image of a skull formed by blue binary code on a black background, with scattered ones and zeros and digital noise, symbolizes how stealthy prompt injection attacks can exploit AI logic to bypass security controls.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/01_Malware_Category_1920x900-5-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 31, 2026 [#### Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/) * [Cloaked Ursa](https://unit42.paloaltonetworks.com/tag/cloaked-ursa/ "Cloaked Ursa") * [Entra ID](https://unit42.paloaltonetworks.com/tag/entra-id/ "Entra ID") * [Microsoft Teams](https://unit42.paloaltonetworks.com/tag/microsoft-teams/ "Microsoft Teams") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/ "Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams") ![Pictorial representation of AI-enabled malware. A vibrant digital interface displaying various icons and graphs, resembling a futuristic network or data analysis dashboard. The scene is illuminated with glowing lights and patterns.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/AdobeStock_1270203474-2-1-786x368.png) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 25, 2026 [#### The State of AI-Enabled Malware August 2026: From Brand Abuse to Agentic Execution](https://unit42.paloaltonetworks.com/ai-enabled-malware-analysis/) * [Backdoor](https://unit42.paloaltonetworks.com/tag/backdoor/ "backdoor") * [Bitcoin](https://unit42.paloaltonetworks.com/tag/bitcoin/ "Bitcoin") * [DLL hijacking](https://unit42.paloaltonetworks.com/tag/dll-hijacking/ "DLL hijacking") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-enabled-malware-analysis/ "The State of AI-Enabled Malware August 2026: From Brand Abuse to Agentic Execution") ![Pictorial representation of identity abuse through trusted communication channels. Close-up view of a digital screen displaying a glitched and pixelated image of a skull-like shape.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/02_Malware_Category_1920x900-2-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 20, 2026 [#### Identity Abuse Through Trusted Communication Channels](https://unit42.paloaltonetworks.com/communication-channel-identity-risks/) * [Authentication](https://unit42.paloaltonetworks.com/tag/authentication/ "authentication") * [Identity theft](https://unit42.paloaltonetworks.com/tag/identity-theft/ "identity theft") * [Malware](https://unit42.paloaltonetworks.com/tag/malware/ "malware") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/communication-channel-identity-risks/ "Identity Abuse Through Trusted Communication Channels") ![Pictorial representation of Kimwolf botnet malware family. 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A close-up of a computer circuit board with a central microchip is depicted. Red digital data streams in the form of glowing binary numbers and arrows appear to flow in and out of the chip. The scene is illuminated with a futuristic blue and red glow.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/04_Malware_Category_1920x900-4-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 10, 2026 [#### The Permanent Threat: Analyzing Aeternum's Blockchain-Based C2 Operations and Communications](https://unit42.paloaltonetworks.com/aeternum-blockchain-c2-analysis/) * [Aeternum](https://unit42.paloaltonetworks.com/tag/aeternum/ "Aeternum") * [Infection chain](https://unit42.paloaltonetworks.com/tag/infection-chain/ "infection chain") * [JSON](https://unit42.paloaltonetworks.com/tag/json/ "JSON") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/aeternum-blockchain-c2-analysis/ "The Permanent Threat: Analyzing Aeternum’s Blockchain-Based C2 Operations and Communications") ![Pictorial representation of ChainDrop, a self-propagating npm worm. An artistic depiction of a digital workspace featuring an open laptop with a red virus on the screen.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/03_Malware_Category_1920x900-7-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/07/top-threats.svg)High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) August 6, 2026 [#### ChainDrop: Inside a Self-Propagating npm Worm](https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/) * [Blockchain](https://unit42.paloaltonetworks.com/tag/blockchain/ "blockchain") * [ChainDrop](https://unit42.paloaltonetworks.com/tag/chaindrop/ "ChainDrop") * [Claude code](https://unit42.paloaltonetworks.com/tag/claude-code/ "Claude code") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/chaindrop-npm-worm-analysis/ "ChainDrop: Inside a Self-Propagating npm Worm") ![Pictorial representation of Token-jacking. A person types on a laptop with multiple digital interface elements projected, including an "AI" icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/08/AdobeStock_1246251272-2-786x369.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2024/06/icon-threat-research.svg)Threat Research](https://unit42.paloaltonetworks.com/category/threat-research/) August 6, 2026 [#### Token Jacking: Cybercriminals Could Be Stealing Your AI Resources](https://unit42.paloaltonetworks.com/ai-token-jacking/) * [AI API](https://unit42.paloaltonetworks.com/tag/ai-api/ "AI API") * [AI gateway](https://unit42.paloaltonetworks.com/tag/ai-gateway/ "AI gateway") * [API keys](https://unit42.paloaltonetworks.com/tag/api-keys/ "API keys") [Read now ![Right arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-right-arrow-withtail.svg)](https://unit42.paloaltonetworks.com/ai-token-jacking/ "Token Jacking: Cybercriminals Could Be Stealing Your AI Resources") * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) * ![Slider arrow](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/slider-arrow-left.svg) ![Close button](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/close-modal.svg) ![Enlarged Image]() ![Newsletter](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/03/unit42-footer-subscribe-desktop.png) ![UNIT 42 Small Logo](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/palo-alto-logo-small.svg) Get updates from Unit 42 ## Peace of mind comes from staying ahead of threats. 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