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

Static analysis result for SHA-256 194f6a77ed2960f4…

MALICIOUS

Office (OOXML) / .XLSM

101.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1d779a90f9e242af6800f035f513afeb SHA-1: 01d7b5dc5072874aef16396f4b4e621dab0339a6 SHA-256: 194f6a77ed2960f4dc4bf65a4bbe99631df0874f72b3211b6d027e66e9dd9e45
250 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This XLSM file contains both VBA macros and Excel 4.0 macros, with the VBA code explicitly calling URLDownloadToFileA to download a file from one of the provided URLs. The presence of an Auto_Open macro and the ClamAV detection further indicate malicious intent. The Excel 4.0 macros likely serve to conceal or facilitate the execution of the VBA payload, which is designed to download and run a second-stage payload.

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://190.14.37.25/
    • http://51.89.115.101/
    • http://176.126.113.167/
    • http://190.14.37.25/�
    • 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
37e4e887bb3ed27eea2797b3dfedc4e5b0040cf814d2883b4c7bbef6f6d93842		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2670 bytes
vbaProject_00.bin
b56ec00af705253afcae3e8d0bfeeda3e6335598722ac30ea90522666c98ec00		 vba-project OOXML VBA project: xl/vbaProject.bin 18944 bytes
xlm_sheet_00.xml
cfc7398f1c5e030893e4f32c18d2d5dd4ee80902bd65e2430497fbdc1a76aad0		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1515 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.