{
  "timestamp": "2025-02-05T23:04:15.664045",
  "model": "deepseek/deepseek-r1-distill-llama-70b",
  "request": {
    "messages": [
      {
        "role": "system",
        "content": "You are a security advisor providing end-user guidance on data security and protection.\n            Focus on practical, easy-to-follow security recommendations."
      },
      {
        "role": "user",
        "content": "\n            Provide clear security guidance based on:\n            \n            Content to reference:\n            Search Free Trial Get Demo Suspected BEC Campaign Targeting Banks September 16, 2019 In the past week weve been receiving reports of differentbut seemingly relatedemail malware campaigns targeting banks in both the US and Europe, specifically in the form of Excel Workbooks containing a malicious macro being sent as an attachment to emails. Whats interesting is that even though the email themes used are varied, the attached bait documents are mostly similar. Below we have provided an example email and a step-by-step analysis of the malicious Excel Workbook attachment being utilized, along with Indicators of Compromise listed at the bottom. We have not been successful in acquiring the final payload from the malware servers, so we have no idea what the main purpose of this campaign is at this moment. We will update this blog with any new information. Example email from one of the related campaigns utilizing the Excel Workbook attachment. How It Works Payload Analysis Excel Workbook Attachment Once you open this Excel Workbook, you will see a decoy image prompting you to enable the macro content from the Office Security Options Drops embedded XLSX to the Windows temporary directory as 13.xlsx Renames XLSX file 13.xlsx.zip Extracts either carpc2.dll for 64-bit or carpc2.dll for 32-bit Windows Loads the extracted DLL with LoadLibrary API and calls the Get2 export function DLL Behaviour Once loaded, the DLL decrypts a needed function, which also decrypts and decompresses the main DLL at runtime. The 32-bit main DLL is packed with UPX unlike the 64-bit version which is not. The main DLL will then gather the following information from the affected system Computer Name User Name OS Version Currently running process names This information is then used as parameters for the beacon to its servers Depending on the servers response, it may attempt to download and execute a final payload into the affected system. URL Parameter format DCOMPUTERNAMEUUSERNAMEOSOS VERSIONPRURL ENCODED PROGRAM NAME LIST Example DPWNM3UM3PWNOS6.2PRApplicationFrameHost2eexe7cMSASCuiL2eexe7cMicrosoft2ePhotos2eexe7cOneDrive2eexe7cRuntimeBroker2eexe7cSearchUI2eexe7cShellExperienceHost2eexe7cSystemSettings2eexe7cdllhost2eexe7cexplorer2eexe7cida2eexe7cjusched2eexe7cloaddll2eexe7collydbg2eexe7cprocexp2eexe7cprocexp642eexe7csihost2eexe7csvchost2eexe7ctaskhostw2eexe7ctbzrcache2eexe7cvmtoolsd2eexe7c User-Agent Mozilla4.0 compatible MSIE 8.0 Windows NT 5.1 Trident4.0 .NET CLR 1.1.4322 .NET CLR 2.0.50727 .NET CLR 3.0.4506.2152 .NET CLR 3.5.30729 InfoPath.2 CIBA MS-RTC LM 8 Indicators of Compromise and Cyren Detections Object ID Object Type SubjectFilenameRemarks Region Cyren Detections ad324e00e98a9997fa37d69cf35eede21f12bdf8cc4e00158856f2fb46fc7153 E-mail INSTRUKCIJE W32Agent.BEH.gen!Eldorado 81eb3102810bd069ea810ada270eebaea22c20c423de565608a928010a0b806a OLE Workbook Inv.2019.xls W32Agent.BEH.gen!Eldorado df7b6fef7a8050598c3a94a7aa97f49fa1aa89d04a49b03a3ef40e7842172ccd Win32 DLL carpc1.dll W32Agent.BEH.gen!Eldorado b41def8d777a13dd709bfbb2b46f572ed69d08263e98a6868de5751b4b015bd4 Win64 DLL carpc2.dll W64Agent.BEH.gen!Eldorado hxxpsupdate365-office-ens.comrb8 URL Malware Host W64Agent.BEH.gen!Eldorado 3f13c868705e6b09194d2a5db4fc3a2bc991de718f4a4e89ae08f21fbacb34e6 E-mail Payment information W32Agent.BEH.gen!Eldorado 8fbcc5e457c4e223148820cf4a1b6f760c819bf0bf0b5c61b92dcf8d5f8b5805 OLE Workbook PMT_2387718626_200054047_201112170000.xls W32Agent.BEH.gen!Eldorado 24bfc5cb1ec25bd914d5561a9972f50ea4da6aae9013e2c9c0f7e19fd02d1d31 E-mail Document for Signature W32Agent.BEH.gen!Eldorado 025a5d51b42f1c8868881d18a6043511c6dffdc402a4eefd988957e924711396 OLE Workbook SM_091019_44627044104226.xls W64Agent.BEH.gen!Eldorado 27a328a7a46f6d6ad5e09accb2d1d54d53763645c3c479adef4b44df2e01f314 E-mail Document for Signature W32Agent.BEH.gen!Eldorado 37e84a72f10d6776cdc73da0acabbc54d155f10e9ee1582b6355657b00740c42 OLE Workbook SM_091019_33138272845852.xls W64Agent.BEH.gen!Eldorado 120721eb9a6b01afd9a7c2396b272216fe418da8495fa05cf89d4bf07d72f18f E-mail Document for Signature W32Agent.BEH.gen!Eldorado df7316a4fb5b69a98bd2fc13c2feb5e3cb2b66e78e1f9edf153f35e7859c7b5e OLE Workbook SM_091019_10207745772443.xls W64Agent.BEH.gen!Eldorado cf6ea94045e1c617740a868b63cf5ce1ac852847b3a65f31b45fe498fd2377ef E-mail Psr Emailing SKM_C78700614072127.xls W32Agent.BEH.gen!Eldorado 19cf85cd5b43237c2aa22af41435e052c99eba5383768df3acdb60c1d664c8dc OLE Workbook SKM_C78700614072127.xls W64Agent.BEH.gen!Eldorado dbcbb94f1ca2893d05d6a71cca719bff01ae4ce4a35060e9f78a8bfaa523d122 E-mail Scanned W64Agent.BEH.gen!Eldorado 836d893a99137a0944d02caddea626586ce0ae081acfe2476997ebb2e6b49bc1 OLE Workbook scan0880.xls W64Agent.BEH.gen!Eldorado If you are thinking about evaluating new email security services, why not try Cyrens Email Security Gap Analysis assessment, which is easy to deploy alongside your existing email security and free of charge to qualifying companies. Try it for Free Instant Data Classification Cyren URL Category Chacker Prev Is The Email Security Industry About To Lose Another Major Vendor? Exploiting CAPTCHA The Latest Evasive Phishing Tactic Next Company Partners Resources Investor Relations Products Freeware Demo Solutions Contact Us Privacy Management Service by Data443\n            \n            Your guidance should include:\n            1. Easy-to-follow security best practices\n            2. Data protection recommendations\n            3. Safe usage guidelines\n            4. Common security risks and prevention\n            5. Privacy protection measures\n            6. When to seek additional security support\n            "
      }
    ],
    "model": "deepseek/deepseek-r1-distill-llama-70b"
  },
  "response": {
    "content": "**Comprehensive Guidance on Mitigating the BEC Campaign Targeting Banks**\n\n1. **User Education and Awareness**\n   - **Training:** Conduct regular training sessions to educate users about the risks of enabling macros in attachments from unknown sources. Highlight the importance of cautious behavior when handling emails, especially those with attachments like Excel files.\n\n2. **Macro Settings**\n   - **Disable Macros:** Advise organizations to disable macros by default, especially for files from untrusted sources. Use Microsoft Office\u2019s Trust Center to restrict macros to trusted locations only.\n\n3. **Email Security Solutions**\n   - **Email Protection:** Implement advanced email security solutions that scan attachments for malicious content, including macro analysis to detect and block suspicious behavior.\n\n4. **Network Monitoring**\n   - **Traffic Analysis:** Monitor network traffic for URLs matching the patterns described in the attack. This can help in early detection of potential compromise.\n\n5. **Endpoint Protection**\n   - **Anti-Malware Solutions:** Use endpoint protection software that can detect and block malicious DLLs and their execution, preventing the payload from running.\n\n6. **System Updates and Patches**\n   - **Regular Updates:** Ensure all systems are updated with the latest patches to protect against vulnerabilities that the payload might exploit.\n\n7. **Data Backups**\n   - **Backup Regularly:** Implement regular backups to critical data. In case of an attack, backups can help restore data without ransom payment.\n\n8. **Incident Response Plan**\n   - **Response Preparedness:** Develop and regularly test an incident response plan to quickly respond and mitigate potential breaches.\n\n9. **Seeking Additional Support**\n   - **Professional Help:** If any Indicators of Compromise (IoCs) are detected or there is suspicion of compromise, seek immediate assistance from cybersecurity professionals.\n\nBy following these steps, organizations can enhance their security posture and reduce the risk of falling victim to such BEC campaigns.",
    "usage": {
      "prompt_tokens": 1810,
      "completion_tokens": 870,
      "total_tokens": 2680
    },
    "model": "deepseek/deepseek-r1-distill-llama-70b"
  }
}