Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 078b9e6f25285087…

MALICIOUS

Office (OOXML)

178.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-17
MD5: 6ab42c5e199aa97a713c33ac4f462b80 SHA-1: 7ba711855f0a4b85b7b730dd624b4b0210267a4c SHA-256: 078b9e6f25285087e5caa0122420a46f5281ed5e4dbb101b5e7b7fc453b3e8e0
182 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, indicated by critical heuristic firings. The macros utilize dangerous functions like FORMULA, WORKBOOK.HIDE, and HALT, which are known to be used for downloading and executing payloads. The embedded URLs, https://keema.tk/SrJfCix7DHn/zv and https://birliklpgotogaz.com/05JQwseTb/zv, are likely sources for this payload.

Heuristics 4

  • Excel 4.0 macro sheet (1 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, WORKBOOK.HIDE, 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.
  • 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://keema.tk/SrJfCix7DHn/zv In document text (OOXML body / shared strings)
    • https://birliklpgotogaz.com/05JQwseTb/zvIn 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)
    • 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/intlsheet1.xml 208741 bytes
SHA-256: baf5eb0d54f53574f5b47e6a6aadd3e3e7e3d7ffc3b25f5c7226b5a9ce7ae7e8
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:BV283"/><sheetViews><sheetView showFormulas="1" zoomScaleNormal="100" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="4.28515625" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="39" width="4.28515625" style="2"/><col min="40" max="40" width="4.140625" style="2" customWidth="1"/><col min="41" max="52" width="4.28515625" style="2" hidden="1" customWidth="1"/><col min="53" max="16384" width="4.28515625" 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"
... (truncated)

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