Office (OOXML) / .XLSX malware analysis — malicious · aae2cf00546070ed

MALICIOUS

Office (OOXML) / .XLSX

254.6 KB Created: 2021-04-13 11:33:03 UTC Authoring application: Microsoft Excel 16.0300

MD5: 31db3473a93ac2831bd895b0d83154ec SHA-1: aaef0d7e0bd4094c0ecbc19c69cc85954f209820 SHA-256: aae2cf00546070edda9898e8439236bb06001d46d2649d8a859a5952bb5229dd

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to download and execute malicious payloads. The macro content is heavily obfuscated and truncated, preventing a more detailed analysis of its specific actions or the reconstruction of any URLs or commands. Therefore, the exact family cannot be determined, and no specific IOCs can be extracted.

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.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `5d0eda81a2078cd79f8a94978fa88cb1655a0bbc17796913babee545806aea7c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	2585 bytes

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