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

Static analysis result for SHA-256 7071600068d739bf…

MALICIOUS

Office (OOXML) / .XLSM

20.1 KB Created: 2021-03-17 08:41:18 UTC Authoring application: Microsoft Excel 16.0300
MD5: 496b1f5726ab57b7cd3040c3bb3d2710 SHA-1: a7f40aa80de0a5284d4796c3d23b7133b04fd9dc SHA-256: 7071600068d739bfec9ed214506aa87262539651f4a9f9f02128cf0269613a1b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

This XLSM file contains Excel 4.0 macros, including an Auto_Open defined name, indicating it is designed to execute code upon opening. The document body presents a deceptive message claiming the document is encrypted and requires enabling content, a common social engineering tactic. The presence of Excel 4.0 macros suggests an attempt to download and execute a secondary payload.

Heuristics 3

  • 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.
  • Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME
    Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
  • 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://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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
8f16bf398199df12fe31ff9da1f1711b8e2039950a49b585f884e39018c7cddf		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 17154 bytes

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