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

Static analysis result for SHA-256 c87cd0a36e0f14dc…

MALICIOUS

Office (OOXML) / .XLSX

106.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 14.0300
MD5: 14e9289c3d755e9085848eda52a1ee8b SHA-1: 548cf0e51c92f55a551ff1353d4def6160ccf400 SHA-256: c87cd0a36e0f14dc2582ba10a31d9db5f4697be36e4bdd80935af4ed4704976c
180 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like CALL and EXEC, indicating an attempt to download and execute a payload. The document body explicitly contains two unknown URLs, which are likely the sources for this payload. The presence of Auto_Open suggests automatic execution upon opening.

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://industrialarttextile.com/QSG9tCTB7/hadrt.html
    • https://anaheimdermatologists.com/tzJ9kyP6iG/hasrt.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
c9639b11fec63901134871fb42359ef3e65db62f61fe3d9d626b901c1c1931a3		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 206597 bytes

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