Qbot — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 c802b9ab9914602a…

MALICIOUS

Office (OOXML) / .XLSX

1.18 MB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-04-21
MD5: 91b2ee2ffa2661cf9905520d55988f54 SHA-1: a39187b307655be681ca3779c6e26d2bd7144de0 SHA-256: c802b9ab9914602a57b3e4e8ce02abc297067bb95c1db14eb9a5a998dba281ed
140 Risk Score

Malware Insights

Qbot · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic OOXML_XLM_MACROSHEET indicates the presence of Excel 4.0 macros. The ClamAV detection explicitly names this as Qbot. The extracted macro sheet content reveals paths like C:\Testes\Fretedsf\Vertu.OCX and C:\Testes\Fretedsf\Vertua.OCX, suggesting the macros are designed to drop and execute these malicious OLE objects. This is consistent with Qbot's typical delivery mechanism.

Heuristics 3

  • 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.Downloader.Qbot04223-9946522-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Qbot04223-9946522-0
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
24683ff192d5ff2bf2f841df675e1bec8a46ae42de534fcdbc64fb77dd4f33a5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 4465152 bytes
emf_00.emf
481999fdbcc1fde5a4e3a4e9970e4bbf3c8dbeb2e2a366cc840aa848993159f4		 ooxml-emf OOXML EMF part: xl/media/image2.emf 2159428 bytes
xlm_sheet_00.bin
4af5c769dc22fdfcc989d5f012ef0e152bb7e5f589f2554a664246d8fd30f6a4		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 2317 bytes

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