Qbot — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 7f64fbffa9d470bb…

MALICIOUS

Office (OOXML) / .XLSX

26.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 8afc96284ee688d3d951d77470088961 SHA-1: 1c031aa95ce92ea0683af6a2e7dc4988a665b229 SHA-256: 7f64fbffa9d470bbf088799623d68ee12083a239d565d5c2d288d5f1f98472e7
120 Risk Score

Malware Insights

Qbot · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature Xls.Dropper.QbotDocu12020-9818439-0, indicating it is a Qbot variant. Static analysis revealed the presence of Excel 4.0 macros within an XLM macro sheet. These macros are typically used to download and execute further stages of the malware. The heuristic firings confirm the presence of these macro sheets.

Heuristics 2

  • Excel 4.0 macro sheet (1 sheet(s)) critical 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. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
  • ClamAV: Xls.Dropper.QbotDocu12020-9818439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.QbotDocu12020-9818439-0

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
efdf16876203f44fe7b98ede18e9b2e23550da42636a1900c23d16b3665bb1a4		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 3326 bytes

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