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

Static analysis result for SHA-256 fb7d3e3abf2d0a67…

MALICIOUS

Office (OOXML) / .XLSM

106.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 14.0300
MD5: f86c6670822acb89df1eddb582cf0e90 SHA-1: 4ecaaa74c4ae40f45ea7def136869fc76967508c SHA-256: fb7d3e3abf2d0a67d1134871b65c8f79367e55e145ffe6c11866e440988d2965
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious Link: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an XLSM file containing Excel 4.0 macros. Critical heuristics indicate the use of dangerous XLM functions like CALL and EXEC, which are often used to download and execute payloads. The document body contains URLs that are likely the targets for these macro executions. The presence of these functions and URLs strongly suggests an attempt to download and run a second-stage payload.

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://legalopspr.com/BnUwbRV9foc/hartd.html
    • https://dentistelmhurstny.com/42te9VZqUDc/hadrt.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
fc057e71bc00a5af570026c2658398f5e54ea7518b7d4e94988fea505f7aeb50		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 206518 bytes

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