Emotet Office (OOXML) / .XLSM malware analysis — malicious · 61180ae417cb0b40

MALICIOUS

Office (OOXML) / .XLSM

49.3 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-15

MD5: 5a87bb1985bd1a7fa6b6356c111197ec SHA-1: 1348e737b6b65db7ccdac3586756a676c0e362a6 SHA-256: 61180ae417cb0b40860d6f575c502d581b0eb545cf574f2cf34a08c11168b580

250 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The file is an Excel macro-enabled spreadsheet (XLSM) containing Excel 4.0 macros, which is a strong indicator of malicious intent. The macros utilize dangerous API calls like FORMULA to download a payload from one of the provided URLs. The reconstructed filename 'regsver32.exe' and the paths '\Windows\' and 'SysWow64\' suggest the downloaded payload is intended to be executed. ClamAV detection further confirms its malicious nature, identifying it as Emotet.

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://alinatourbg.com/mail/TBCGVNzLeENXb/
- http://www.alsancaklimanemlak.com/system/T8nE1jfQ7W/
- http://alsanjari.co.uk/alsanjari.com/CynW/
- http://amasides.my.id/cgi-bin/uFqdwCqAP7mro/
- http://alinac.ca/images/Lp6yKpIpRf6/
- http://amakpost.com/assets/c8AT1uoCVLSxez/
- http://alicehui.com/pics/fETgjDyPfUBQp/
- 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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