Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 791a7b02efd1f0c9…

MALICIOUS

Office (OOXML) / .XLSM

102.8 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9616733191ec8a6e085cd86aebfd5908 SHA-1: da4e15e19f36c3d86fa950cdf8d9a4234d7171ae SHA-256: 791a7b02efd1f0c9057b5979020d4f99f84cc05bc8ef9d4511d94aad35c58adc
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.005 Visual Basic T1059.005 Visual Basic T1059.005 Visual Basic

The file is an XLSM document containing VBA macros and Excel 4.0 macros. The Auto_Open macro and the Excel 4.0 macros are configured to download and execute a second-stage payload from one of the embedded URLs. The Excel 4.0 macro sheet explicitly constructs the URL "http://190.14.37.28/". The VBA macro uses the URLDownloadToFileA function, indicating a downloader functionality.

Heuristics 7

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
  • ClamAV: Xls.Downloader.Docusign112101-9908076-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Docusign112101-9908076-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://190.14.37.28/
    • http://45.138.172.96/
    • http://185.82.200.35/
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7916640770de72821f454a596bb6b8124e7c3ec3c1eb08d6506bb51462c9d332		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2436 bytes
vbaProject_00.bin
770625581fa76c01d01bbae593aa982554988ea220ea2f0b4426277839bdf9e8		 vba-project OOXML VBA project: xl/vbaProject.bin 18944 bytes
xlm_sheet_00.xml
e014b7d83fce87cd73993a00c9f70dd0fd5770c4aa411e5d991b67bb43eaeb32		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 2247 bytes

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