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

Static analysis result for SHA-256 911f37e9fe92161d…

MALICIOUS

Office (OOXML) / .XLSM

82.7 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 67398520c01b7587b3d25b7ca0ddbf98 SHA-1: 06fb16bfb3ee49c3d7cdcc3ee3b3e495785f1abe SHA-256: 911f37e9fe92161d71061c7fd2e1979f842085fced0a4835e0de859282506760
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: Malicious File T1105 Ingress Tool Transfer

The file is an XLSM document containing Excel 4.0 macros. Heuristics indicate the use of dangerous XLM functions like CALL and EXEC, which are commonly used to download and execute payloads. The embedded URL 'http://yzq24meogxq03bsvfu.xyz/grays.gif' is highly suspicious and likely serves as the source for the second-stage payload. The document body text also contains references to registration and HTTP, further supporting the download and execution attack pattern.

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: CALL, HALT, EXEC 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 http://yzq24meogxq03bsvfu.xyz/grays.gif
    • 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
47059990db40a64add5f4efec6b0d89d525000cd7db82866d683de40ae96e7f9		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 13012 bytes
xlm_sheet_01.xml
667d2ea2f48605640a6618605c8ff9ad16cb69cc91bad065461c1020086357be		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1025 bytes
xlm_sheet_02.xml
a8224c10dfc4161a002171a8fb5b73cbf446b59af7a81b66ba37a33405c30c12		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 19448 bytes

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