Hancitor — Office (OOXML) malware analysis

Static analysis result for SHA-256 c2255baa3bd2f14c…

MALICIOUS

Office (OOXML)

298.5 KB Created: 2021-10-21 16:10:26 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-10-31
MD5: 0b21791c008f8e1e4354d9757cedf4be SHA-1: cd8f770b49b6a66faf784d602592198952a2b7bb SHA-256: c2255baa3bd2f14c24c0ecd76aec870d23787e6c1fed5b5a556fa971e5264cbd
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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