Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e5936f60478373eb…

MALICIOUS

Office (OOXML)

58.3 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: 25f943be1bb8caf3d5954dbb68a908b9 SHA-1: 880ac0354c7b1b31e053396aef83061b8642873f SHA-256: e5936f60478373eb2bba2acb992531d5c753130937f3ecc160904a5663b4c31b
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 macros, indicated by multiple critical heuristic firings. These macros utilize dangerous functions like CALL and FORMULA to download and execute a payload from the URL 'metalpro.com.ng/url.zip'. The presence of hidden sheets and the Auto_Open defined name further suggest malicious intent.

Heuristics 5

  • 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: FORMULA, WORKBOOK.HIDE, WORKBOOK.UNHIDE, HALT, CALL 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.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
d19e4fc01b96c6a538dcbbb9512b2525269c19388e38481fc9686f617ff3ea33		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 172122 bytes
xlm_sheet_01.xml
81780bf2c76341ddbf110167f17f527397c66263c41a7403fb1c087d49c277fb		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 90061 bytes
xlm_sheet_02.xml
d740d1584ef9a56ebe95f9dea25af7ab6bb6f78920d7427679892e16b70beaf5		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 117001 bytes

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