Emotet — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 7b9b4722f2d9bc3c…

MALICIOUS

Office (OOXML) / .XLSM

46.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-03
MD5: 1da7bb4ffd8cda2de23a1434cddb91ee SHA-1: bff9050a077f716e1e297defd1ec859fef7993d8 SHA-256: 7b9b4722f2d9bc3c442af3337867b3274f780d51563c7419339c2e5d56d1771c
252 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is an Excel macro-enabled spreadsheet (XLSM) containing Excel 4.0 macros. These macros utilize dangerous functions like FORMULA to construct and download payloads from multiple URLs. The ClamAV detection explicitly names this as an Emotet downloader. The macros are designed to download and execute a second-stage payload from the embedded URLs, a common Emotet tactic.

Heuristics 7

  • 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.
  • Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME
    Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
  • Dangerous XLM formula APIs: FORMULA critical OOXML_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
  • ClamAV: Xls.Downloader.Emotet03220-9940726-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet03220-9940726-0
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 5 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • URL reconstructed from XLM formula cell-concatenation (6 URLs) info OOXML_XLM_FORMULA_CONCAT_URL
    An Excel 4.0 (XLM) macro sheet assembles its payload URL by concatenating per-character/fragment cells in formula reference order (=FORMULA.FILL / chained =SET.VALUE with & across sheets). The URL is never contiguous and row/col-major cell reconstruction misses it; recovered by resolving the formula's references in order. Surfaced as an IOC.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rosywhitecleaningsolution.com/wp-admin/PqMw6fND8Bb1I4VPR10/
    • http://aopda.org/wp-content/uploads/RDL75PME7OKHk4f/
    • http://havilaholuemglobal.com/dofz29/ymIfCcEL8I5kjA6E/
    • https://chera.co.kr/wp-includes/i2nnUkDXZ/
    • http://www.floresguitarinstruction.com/wp-admin/jWlCX/
    • http://www.drcc.co.za/restoredcontent/nAKvnbRpazx7c/
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
c2beed76b90707ab99d3556b095847fbe67565665bab2978d4d40d1b769c68e7		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 4017 bytes
xlm_sheet_01.xml
3f1e04bcb932a0d7a0ca09ad6e05d398d7a144c4cda86314010c0ec3e9f94573		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1278 bytes
xlm_sheet_02.xml
3877aa64e871d2d6fcc766f5b3af64ba0d301f656023d2e6e43652b8210d827c		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1152 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.