[![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") * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/ "High Profile Threats") * [Malware](https://unit42.paloaltonetworks.com/category/malware/ "Malware") [Malware](https://unit42.paloaltonetworks.com/category/malware/) # The Latest Kuluoz Spam Campaign Kicks Off ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 2 min read Related Products [![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: * [Ryan Olson](https://unit42.paloaltonetworks.com/author/ryan-olson/) * ![Published Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-calendar-grey.svg) Published:May 20, 2014 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [High Profile Threats](https://unit42.paloaltonetworks.com/category/top-cyberthreats/) * [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: * [Kuluoz](https://unit42.paloaltonetworks.com/tag/kuluoz/) * [Trojan](https://unit42.paloaltonetworks.com/tag/trojan/) * [![Download Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-download.svg)](https://unit42.paloaltonetworks.com/latest-kuluoz-spam-campaign-kicks/?pdf=download&lg=en&_wpnonce=a0d449e753 "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/latest-kuluoz-spam-campaign-kicks/?pdf=print&lg=en&_wpnonce=a0d449e753 "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%20Latest%20Kuluoz%20Spam%20Campaign%20Kicks%20Off&body=Check%20out%20this%20article%20https%3A%2F%2Funit42.paloaltonetworks.com%2Flatest-kuluoz-spam-campaign-kicks%2F "Share in email") * [![Facebook Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-fb-share.svg)](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Funit42.paloaltonetworks.com%2Flatest-kuluoz-spam-campaign-kicks%2F "Share in Facebook") * [![LinkedIn Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-linkedin-share.svg)](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Flatest-kuluoz-spam-campaign-kicks%2F&title=The%20Latest%20Kuluoz%20Spam%20Campaign%20Kicks%20Off "Share in LinkedIn") * [![Twitter Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-twitter-share.svg)](https://twitter.com/intent/tweet?url=https%3A%2F%2Funit42.paloaltonetworks.com%2Flatest-kuluoz-spam-campaign-kicks%2F&text=The%20Latest%20Kuluoz%20Spam%20Campaign%20Kicks%20Off "Share in Twitter") * [![Reddit 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%2Flatest-kuluoz-spam-campaign-kicks%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%20Latest%20Kuluoz%20Spam%20Campaign%20Kicks%20Off%20https%3A%2F%2Funit42.paloaltonetworks.com%2Flatest-kuluoz-spam-campaign-kicks%2F "Share in Mastodon") At 06:47 PST on May 20 Palo Alto Networks WildFire detected the start of the latest Kuluoz spam campaign. The total number of e-mails detected quickly rose to over 30,000 per hour around noon PST and had not begun to slow down as of 1:30PM PST. ![Untitled](http://blog.paloaltonetworks.com/wp-content/uploads/2014/05/Untitled-500x284.png) Kuluoz is a descendant of the Asprox malware and spreads by sending copies of itself as an e-mail attachment. As the malware infects more systems, the systems begin sending more e-mails which leads to more infections. Kuluoz makes money for its owner by installing other malware, such as crimeware or fake antivirus programs. Kuluoz e-mails often trick the reader into thinking they are delivery notifications (such as UPS or Fedex), or notices from airlines or payment processors. In this case the e-mails claim to contain a document about a court case. ***Subject: Hearing of your case in Court** **From: Notice of Appearance*** *Pretrial Notice, Please, download the copy of the court notice attached herewith to read the details. Note: The case may be heard by the judge in your absence if you do not come.* *Truly yours, Clerk to the Court. Olivia Smith* Each e-mail carries one of the following attachments: * Court\_Notice\_May-20\_Date\_IN-FN\_2014.exe * Court\_Notice\_May-20\_Date\_EN-RM\_2014.exe * DC\_Court\_Notice\_ER\_NSER\[4 Random Numbers\].zip These attachments are different versions of the malware that has been packed to evade antivirus engines. Twelve of the 53 scanners on virustotal.com now detect the [first variant](https://www.virustotal.com/en/file/62596302e894ba95be33ef299f4e6638fb5901f0b63fd15165218f3f8fe040cd/analysis/) of the malware, but only three detect the [latest version](https://www.virustotal.com/en/file/f1c31cb58478949eaccabdc6cc4462ab68e8e189657c2f88c1ae085826ffe7a2/analysis/). To determine where the highest number of infected nodes are, we mapped the sending IP address for each of the attach e-mails to their rough geographic location. While there are infected systems around the world, the largest concentration is in North America, particularly the United Stats and Canada. ![Untitled](http://blog.paloaltonetworks.com/wp-content/uploads/2014/05/Untitled1-500x417.png) Geographic Distribution of Koluoz Spam Nodes in North America Thus far we've detected the following command and control servers in use. * 192\.69.192. 178:443 * 59\.106.185. 11:443 * 173\.203.113. 94:443 * 69\.60.8. 88:8080 * 205\.186.156. 218:8080 The network traffic generated by each Trojan uses the HTTP protocol, and despite its use of port 443, is not encrypted with SSL. As with most fast-spreading malware, antivirus engines will typically begin detecting the files a day or two after the spread has begun. While we haven't seen any indication that the spam volume has begun to slow down, we do expect the campaign to wind down in the next 24 hours, but a new campaign will probably be close behind. WildFire users can rest assured that they'll be protected from whatever Kuluoz has in-store next. Back to top ### Tags * [Kuluoz](https://unit42.paloaltonetworks.com/tag/kuluoz/ "kuluoz") * [Trojan](https://unit42.paloaltonetworks.com/tag/trojan/ "Trojan") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: How Well Do You Understand Your Cyber Adversary? -- Part 2](https://unit42.paloaltonetworks.com/well-understand-cyber-adversary-part-2/ "How Well Do You Understand Your Cyber Adversary? – Part 2") ### Related Articles * [Threat Brief: Widespread Impact of the Axios Supply Chain Attack](https://unit42.paloaltonetworks.com/axios-supply-chain-attack/ "article - table of contents") * [Converging Interests: Analysis of Threat Clusters Targeting a Southeast Asian Government](https://unit42.paloaltonetworks.com/espionage-campaigns-target-se-asian-government-org/ "article - table of contents") * [From DarkGate to AsyncRAT: Malware Detected and Shared As Unit 42 Timely Threat Intelligence](https://unit42.paloaltonetworks.com/unit42-threat-intelligence-roundup/ "article - table of contents") ## Related Malware Resources ![Pictorial representation of TLS Certificate compromise. 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A glowing, blue, brain-shaped structure floats above a central microchip on a circuit board. The scene is futuristic, with neon lights illuminating the interconnected pathways and components.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/10/AdobeStock_637057734-786x368.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/) October 15, 2026 [#### AI-Powered Espionage Campaign Targets Government Linux Infrastructure](https://unit42.paloaltonetworks.com/ai-campaign-targets-linux-infrastructure/) * [Exfiltration](https://unit42.paloaltonetworks.com/tag/exfiltration/ "exfiltration") * [LLM](https://unit42.paloaltonetworks.com/tag/llm/ "LLM") * [Network security](https://unit42.paloaltonetworks.com/tag/network-security/ "network security") [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-campaign-targets-linux-infrastructure/ "AI-Powered Espionage Campaign Targets Government Linux Infrastructure") ![Pictorial representation of PEERSTITCH, a FortiGate implant. A digital illustration depicting a circuit board with a prominent red warning triangle and exclamation mark in the center. The background is filled with various computer circuitry patterns.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/10/09_Vulnerabilities_1920x900-786x368.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/) October 14, 2026 [#### Unit 42 Uncovers PEERSTITCH, a Stealthy FortiGate Implant](https://unit42.paloaltonetworks.com/fortimanager-cve-2024-47575-peerstitch-malware/) * [Apache](https://unit42.paloaltonetworks.com/tag/apache/ "Apache") * [CL-STA-0954](https://unit42.paloaltonetworks.com/tag/cl-sta-0954/ "CL-STA-0954") * [Logging](https://unit42.paloaltonetworks.com/tag/logging/ "logging") [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/fortimanager-cve-2024-47575-peerstitch-malware/ "Unit 42 Uncovers PEERSTITCH, a Stealthy FortiGate Implant") ![Pictorial representation of operation blinder tunnel. Screen displaying code with a prominent alert symbol and the words 'VIRUS DETECTED' highlighted in red.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/05_Malware_Category_1920x900-1-786x368.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/) October 6, 2026 [#### Blinder Tunnel Campaign Targets Iraqi Infrastructure](https://unit42.paloaltonetworks.com/blinder-tunnel-targets-critical-infrastructure/) * [Advanced Persistent Threat](https://unit42.paloaltonetworks.com/tag/advanced-persistent-threat/ "Advanced Persistent Threat") * [Agent Serpens](https://unit42.paloaltonetworks.com/tag/agent-serpens/ "Agent Serpens") * [AppDomainManager](https://unit42.paloaltonetworks.com/tag/appdomainmanager/ "AppDomainManager") [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/blinder-tunnel-targets-critical-infrastructure/ "Blinder Tunnel Campaign Targets Iraqi Infrastructure") ![Pictorial representation of how K8 operators betray your security posture. A close-up of a futuristic microchip with glowing circuits in vibrant colors, including blue, purple, and orange, reflecting light.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/AdobeStock_652069707-1-786x368.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/) September 29, 2026 [#### OperTraitors: How Kubernetes Operators Betray Your Security Posture](https://unit42.paloaltonetworks.com/agentic-ai-kubernetes-operator-risks/) * [AI](https://unit42.paloaltonetworks.com/tag/ai/ "AI") * [AI agents](https://unit42.paloaltonetworks.com/tag/ai-agents/ "AI agents") * [API](https://unit42.paloaltonetworks.com/tag/api/ "API") [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/agentic-ai-kubernetes-operator-risks/ "OperTraitors: How Kubernetes Operators Betray Your Security Posture") ![Pictorial representation of a magnifying glass illuminating a glowing orange circular digital circuit interface on a dark, high-tech background.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/04_Myth-Busting_Overview_1920x900-786x368.jpg) [![category icon](https://unit42.paloaltonetworks.com/wp-content/uploads/2025/08/Insights-icon-white.svg)Insights](https://unit42.paloaltonetworks.com/category/insights/) September 16, 2026 [#### Atomic macOS (AMOS) Stealer Activity](https://unit42.paloaltonetworks.com/atomic-macos-amos-stealer-activity/) * [MacOS](https://unit42.paloaltonetworks.com/tag/macos/ "macOS") * [Threat intelligence](https://unit42.paloaltonetworks.com/tag/threat-intelligence/ "threat intelligence") * [Unit 42](https://unit42.paloaltonetworks.com/tag/unit-42/ "Unit 42") [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/atomic-macos-amos-stealer-activity/ "Atomic macOS (AMOS) Stealer Activity") ![Pictorial representation of post-exploitation identity misuse in SPIFFE/SPIRE. Close-up of a person wearing glasses, with computer code reflected in the lenses.](https://unit42.paloaltonetworks.com/wp-content/uploads/2026/09/12_Security-Technology_Category_1920x900-786x368.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/) September 10, 2026 [#### The Machine With Many Faces: Post-Exploitation Identity Misuse in SPIFFE/SPIRE](https://unit42.paloaltonetworks.com/kubernetes-spiffe-spire-identity-spoofing/) * [API](https://unit42.paloaltonetworks.com/tag/api/ "API") * [Cryptographic](https://unit42.paloaltonetworks.com/tag/cryptographic/ "cryptographic") * [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/kubernetes-spiffe-spire-identity-spoofing/ "The Machine With Many Faces: Post-Exploitation Identity Misuse in SPIFFE/SPIRE") ![Pictorial representation of a pay-per-install threat group campaign prodiving infection service for spreading malware. 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 vibrant cityscape with silhouettes of numerous people walking along a bustling street. 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