Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 09fcfe7a67616b7a…

MALICIOUS

Office (OOXML) / .XLSX

233.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-09
MD5: 7ca1aa9782f1a809e0c2ab7832542bc3 SHA-1: c43543f0900b59bb74be4ca58d55bd89a2e2f600 SHA-256: 09fcfe7a67616b7a5dcebee89db48f98053cd2fe147f2459a4f92d68ad599a5a
120 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file contains multiple Excel 4.0 macro sheets, which are commonly used by Emotet to download and execute additional malicious content. The ClamAV detection explicitly names Emotet, reinforcing this classification. The primary function appears to be the execution of these macros to fetch and run a second-stage payload.

Heuristics 2

  • 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.
  • ClamAV: Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
ba41a11b1be4eaa156bff86597ea809a971edc4d801f70a4529d6d84b93c19c0		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 2469 bytes
xlm_sheet_01.bin
294fba96533e16b8e32fcc670b890c44fe9dfc759e5d84743c74026ba7bd4a20		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 428 bytes
xlm_sheet_02.bin
f0daf3cbff097906d4170f35f5f5c2394e9b70d2a487782035c708617ae7b9ec		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.bin 428 bytes

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