Qbot — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 0cafd8010a738e30…

MALICIOUS

Office (OOXML) / .XLSX

229.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9cbf924257cdba34b24097f3ec82dd1f SHA-1: 340aa0da92817337d518693214a7181f94727955 SHA-256: 0cafd8010a738e305ab12f7c4bedd28bc1bcef37b7d5d1b075a303f7e0eed00b
120 Risk Score

Malware Insights

Qbot · confidence 95%

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

The file was detected as malicious by ClamAV with the signature Xls.Downloader.Qbot022213-9940035-0, indicating a Qbot downloader. Static analysis revealed the presence of Excel 4.0 macros across multiple sheets, which are commonly used to execute malicious code. These macros likely facilitate the download and execution of a secondary payload, consistent with Qbot's behavior.

Heuristics 2

  • Excel 4.0 macro sheet (3 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.Qbot022213-9940035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Qbot022213-9940035-0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
f8697dc5c0d9517e96762ed8c23644a4c803e8aef37bc2fefcd0b4dab3520881		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 2474 bytes
xlm_sheet_01.bin
72c6a109bf29615dd0469909a27069fef9fbea3f2a16397078a7e14813341e64		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 484 bytes
xlm_sheet_02.bin
1b2f59b0ef69a5b44e2672fc66c5bfba0774aa03ceddd3096e61c17dbe8c9e84		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.bin 484 bytes

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