Emotet Office (OOXML) / .XLSM malware analysis — malicious · 9d07e42f1e6ed0cf

MALICIOUS

Office (OOXML) / .XLSM

45.6 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-03

MD5: d99d759b7c175295d41508c4fe348302 SHA-1: be7b8ad1e8561f21893b9babd768b3de1db3bbe5 SHA-256: 9d07e42f1e6ed0cf2ae329895311cba6e756872b908cd23514081eb7df340fb4

250 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Service Control T1059.001 PowerShell T1204.002 Malicious File: User Execution T1105 Ingress Tool Transfer

This XLSM file contains Excel 4.0 macros that leverage dangerous functions like FORMULA to download and execute payloads. The macros construct URLs from concatenated strings and attempt to download files to the \Windows\SysWow64\ directory using regsvr32.exe. The ClamAV detection explicitly names this as an Emotet downloader variant. The primary intent is to download and execute a second-stage payload from the listed URLs.

Heuristics 6

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
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://piajimenez.com/Fox-C/dS4nv3spYd0DZsnwLqov/
- http://janshabd.com/Zgye2/
- http://inopra.com/wp-includes/3zGnQGNCvIKuvrO7T/
- https://justforanime.com/stratose/PonwPXCl/
- http://biomedicalpharmaegypt.com/sapbush/BKEaVq1zoyJssmUoe/
- https://getlivetext.com/Pectinacea/AL5FVpjleCW/
- 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.

Filename	Kind	Source	Size
`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

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