Emotet Office (OOXML) / .XLSM malware analysis — malicious · 3d9c8b61e69d0271

MALICIOUS

Office (OOXML) / .XLSM

49.4 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-16

MD5: 1881ce3e2a8fc1a92ac593d1da673fb9 SHA-1: 282c233921d9df4311cf30c1c63f1467d359b00f SHA-256: 3d9c8b61e69d0271891ea6c0a99eea67180351e4efbb7ab003f48fc744f139ee

250 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell T1105 Ingress Tool Transfer

The sample is an XLSM file containing Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like FORMULA to download payloads from multiple URLs. The ClamAV detection explicitly names this as an Emotet downloader. The reconstructed string 'regsver32.exe' indicates the likely name of the downloaded executable.

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.Emotet03221-9941792-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet03221-9941792-0
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 6 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://arealama.com/assets_template/58DBYXQh01ATcsKY/
- http://antaoco.com/wp-admin/QpyjXPLrEXf3R9/
- http://www.automatic-taps.com/Templates/TyJj6dRjzqE/
- http://arkamani.net/administrator/KIZXGmaRTF6N3qQqH/
- https://www.artificium.es/blogs/mu8yHJ/
- https://www.manchesterot.co.uk/about-us/fxVCCMDni/
- http://www.atara.com.tr/Template/595vJ91nQx/
- 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` `561bd2ad03d5ff349d3a0a4fbda71b956dd8d97a0dbce4e25549bf8a7721c5df`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	4049 bytes
`xlm_sheet_01.xml` `4f892349a6f0ce9450df5d764f02eea0a737d43225bc39e0b3e39eaafe266901`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1276 bytes
`xlm_sheet_02.xml` `f8dcec9dac216a8c4fc7140768d73598afe199c381abfb2f58ad13ed8f5733f6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1152 bytes

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