Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 31ea3370ca06a2af…

MALICIOUS

Office (OLE) / .XLS

153.0 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: bf86559630b855e4bf2c54d641147b24 SHA-1: 182cbac1bdd020fa5fee6ed9d6a50d1071fbe320 SHA-256: 31ea3370ca06a2af45514a59a0ae49dc62ac34bc4dce44402f169a9d6fb93853
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled document containing multiple macro sheets. It references the ShellExecute and URLDownloadToFile APIs, indicating an intent to download and execute external content. The document body presents a deceptive prompt to the user, urging them to enable content for decryption, which is a common lure for macro-based malware. The embedded URLs are likely used to fetch the secondary payload.

Heuristics 5

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • OLE metadata lists many Excel 4.0 macro sheets medium OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wmwifbajxxbcxmucxmlc.com/files/april24.dll~
    • https://rnollg.com/kev/scfrd.dll$8
    • http://wmwifbajxxbcxmucxmlc.com/files/april24.dll

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