Hancitor — Office (OOXML) malware analysis

Static analysis result for SHA-256 3afdf2affb481f3c…

MALICIOUS

Office (OOXML)

298.5 KB Created: 2021-10-21 16:10:55 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-10-31
MD5: 76b613d33e03344c9e3131d3b885f70e SHA-1: c2d75d0a5ea485beee3a88dd86864510ed987e9c SHA-256: 3afdf2affb481f3c44b4f658df7de2191fff7db4b1bfbb079ebda3970ae14960
120 Risk Score

Malware Insights

Hancitor · confidence 95%

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

The file was detected as malicious by ClamAV and identified as an Excel 4.0 macro sheet. This type of macro is commonly used to download and execute secondary payloads, consistent with the Hancitor family's known behavior. The heuristic firings and ClamAV signature strongly indicate a downloader functionality.

Heuristics 2

  • ClamAV: Xls.Downloader.Hancitor03222-9941794-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Hancitor03222-9941794-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 4841 bytes
SHA-256: 9259ee2912a46083f560aa8689efd4605d1f0c677cb5efb80d08792b21225564
Preview script
First 1,000 lines of the extracted script
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... (truncated)

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