Hancitor — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 8662d511c7f1bef3…

MALICIOUS

Office (OOXML) / .XLSX

324.3 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: e2c5c7d099745fa74d4653b6d49338d2 SHA-1: 4450c382f4b84399b85c008258fbd65a95bcb658 SHA-256: 8662d511c7f1bef3a6e4f6d72965760345b57ddf0de5d3e6eae4e610216a39c1
180 Risk Score

Malware Insights

Hancitor · confidence 95%

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

The sample is identified as malicious by ClamAV as Xls.Downloader.Hancitor03222-9941794-0. It contains multiple embedded Excel 4.0 macro sheets, which are indicative of a downloader. The primary function of these macros is to download and execute a secondary payload from a remote source. The presence of these macro sheets and the ClamAV signature strongly suggest the Hancitor family.

Heuristics 3

  • 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.
  • XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSX
    OOXML package is named .xlsx but contains XLSB workbook parts and an international Excel 4.0 macro sheet. This hides XLM macro execution from scanners that trust the extension or only inspect XML worksheet parts. The technique is macro execution, not a document-parser CVE.
  • ClamAV: Xls.Downloader.Hancitor03222-9941794-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Hancitor03222-9941794-0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
d28d704ceab725131328afcbbb440d7ebb70e9aa82ff3f36f8960d268138fa87		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 30353 bytes
xlm_sheet_01.bin
fb9a05dd95df5d5c43e07ce2dd58a69245121c3b7158a91678a964d597caddf5		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin 48802 bytes
xlm_sheet_02.bin
0045be3a060b066ecaeab7c84aaa2aad45f22679cbb5577982f183ffba13c2c6		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin 103820 bytes

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