Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 852422328ad175b6…

MALICIOUS

Office (OOXML) / .XLSX

78.9 KB Created: 2021-03-16 13:14:06 UTC Authoring application: Microsoft Excel 16.0300
MD5: ed65d9d4ed24f249fb607f2e2b1a300b SHA-1: fa9b42d273da039ed6e0901c08dadbca93ae8b99 SHA-256: 852422328ad175b65b3fb72a2f99db551a70626add7e94c3b263e8daed352ae4
60 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of Excel 4.0 macros. The extracted macro content reveals a clear intent to download a DLL file from 'sported.xyz/camp/g/g4gf.dll' and execute it. This suggests a downloader or droppper functionality, aiming to fetch and run a second-stage payload.

Heuristics 1

  • 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
0ca594afefbec99ea444473c88ce1b441a1f81ce928bd4b40e1e871b497639ad		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 2544 bytes

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