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

Static analysis result for SHA-256 a9737ea7359e9ec1…

MALICIOUS

Office (OOXML) / .XLSM

106.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 14.0300
MD5: 30f143dadd4e35e92d2efe8028c96560 SHA-1: 82f942f3fc78c8ae91be7f36055cb0fc6960ea7a SHA-256: a9737ea7359e9ec137e835a8b1a63d846ecd5e78edd33a95d71a36d2b7461f24
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic T1218.011 Rundll32

The sample is an Excel macro-enabled spreadsheet (XLSM) containing Excel 4.0 macros. These macros utilize dangerous functions like CALL and EXEC, which are capable of downloading and executing payloads. The document body explicitly contains two unknown URLs, suggesting they are the intended targets for payload delivery. The presence of Auto_Open and the use of dangerous XLM functions strongly indicate an attempt to execute malicious code upon opening the document.

Heuristics 4

  • Excel 4.0 macro sheet (3 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.
  • Dangerous XLM formula APIs: HALT, CALL, FORMULA, WORKBOOK.HIDE critical OOXML_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
  • 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 https://specialentrydarshan.online/rGbzLPZQ2NS/haart.html
    • https://nowfoundation.org.uk/HX0sMMMbiw/haurt.html
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
77506dd6876315d017d43b59005773cca1964b7092bf13f77a293c8436fa81b3		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 805 bytes
xlm_sheet_01.xml
d58cfd326d0c9337ad8afba611af4e0b433ba8da73c78792d237ba56aea22a55		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 4030 bytes
xlm_sheet_02.xml
d91313200f1c58d9c6d9061b20363ae82b8152777db3c0184419fd94b7f46c54		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 206530 bytes

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