Emotet Office (OOXML) / .XLSM malware analysis — malicious · 76b5bfb7f04b4293

MALICIOUS

Office (OOXML) / .XLSM

69.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-27

MD5: 595d3886de6a158eaa4fa4768bb57a0c SHA-1: d3273ae9a2f24fed38bcd5d44afb2204cc089ee1 SHA-256: 76b5bfb7f04b429347c10d0d5ebf6628946e3edcf1b8d5476198bee2234792f2

270 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is an XLSM document 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 several URLs, including https://vasilestudio.com/wp-admin/pZ1vbd5Z/. The ClamAV detection as 'Xls.Downloader.Emotet03221-9940728-0' strongly suggests an Emotet family infection. The macros appear to construct commands to download and execute files using regsvr32.exe.

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.Emotet03221-9940728-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet03221-9940728-0
External relationship medium OOXML_EXTERNAL_REL

External target in xl/externalLinks/_rels/externalLink1.xml.rels: /Users/Admin/Desktop/File/13j/ZV/ZV.xlsm
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://vasilestudio.com/wp-admin/pZ1vbd5Z/
- https://estesgroup.net/New-site-25062021/UkQPppHG9pLNE/
- https://robointeligentedecomentarios.com/wp-includes/YBS9a02Y68auiEdP/
- https://triclicks.net/wp-admin/bv/
- https://thecanadianarab.com/wp-content/VJ/
- 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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