Emotet Office (OOXML) / .XLSM malware analysis — malicious · 8d97bbfd7c1841ab

MALICIOUS

Office (OOXML) / .XLSM

95.3 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-26

MD5: beb94516d13f1b95d5f776ecce87b628 SHA-1: d9e39b26151c4d22bedc0e5b8c04262220a7acb9 SHA-256: 8d97bbfd7c1841ab000627a52371971220bae3fd4a9c86388b522397722e90ee

250 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell T1105 Ingress Tool Transfer

The sample is an XLSM file containing Excel 4.0 macros, as indicated by multiple critical heuristic firings. These macros utilize dangerous functions like FORMULA to download payloads from several suspicious URLs, including https://distribucionespariente.com/wp-includes/YHQ1W1R2iSznft2vO/. The ClamAV detection as 'Xls.Downloader.Emotet02220-9940466-0' strongly suggests the Emotet family. The macros also attempt to construct paths like 'C:\Windows\System32\regsvr32.exe' for execution.

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.Emotet02220-9940466-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet02220-9940466-0
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 https://distribucionespariente.com/wp-includes/YHQ1W1R2iSznft2vO/
- https://makspeedtech.com/cgi-bin/6BuOTbA/
- https://newmainghantabazar.com/wp-includes/tyiPqbUMvMq79yMyM8E/
- https://mbahauddin.com/v/2horjuyP/
- https://cafedeltren.t1.curious.tech/v/oa9AwvFnbCZ59xoyBB/
- 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` `6dd9356952cdd6b95caf156e3e1c1471d7e098b9395e326c2a5a80643c35f018`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	3546 bytes
`xlm_sheet_01.xml` `966e861f35410708893ffb1f97241504111fc93333012aa9c7613d379c3c60bb`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1204 bytes
`xlm_sheet_02.xml` `67d74ce6825b900ebce4400789acf68e409bb1eeffe279bee966d138d9d814c1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1227 bytes

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