Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 4b40c30bd19d2fe3…

MALICIOUS

Office (OOXML) / .XLSX

240.1 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-05-05
MD5: 21538116c5deb9a60e95947eec04c986 SHA-1: 3760e6acc255d0bb1a44cc39ec4a29768cbe1e53 SHA-256: 4b40c30bd19d2fe3052397dce9015e26755d109ad3cf83c5cf23a695a13bce4d
120 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Xls.Downloader.Emotet-OOXML_XL-af43432fbcb8603c-9980048-0. Static analysis revealed the presence of Excel 4.0 macros. These macros contain URLs such as 'ordisoss.com/9bVAa06WXzsj/Knhfn.png' and 'ncelltech.com/qVFmE4M5BR/Knhfn.png', which are likely used to download and execute a second-stage payload. The presence of these elements strongly suggests a downloader functionality, consistent with the Emotet family.

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
56ddade77d7e32930aed597b7717dc3eff76587b10e692229752e1522d34b56e		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 998 bytes
xlm_sheet_01.bin
6596a1a91ff1e8511c9bacd26b0ed25c9acae41209ca6bf1af5b0af2340b0150		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.bin 2652 bytes
xlm_sheet_02.bin
4aa675529670262d62d2072b2082c4d2e236f5f4a3a27db04178011a4f7c7c65		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.bin 1336 bytes

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