Emotet Office (OOXML) / .XLSM malware analysis — malicious · 2fbf7274c9e1537b

MALICIOUS

Office (OOXML) / .XLSM

69.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-28

MD5: f0d7846f1101c7d13407466aa5f2a835 SHA-1: a100f896b6f5ba646103c4d7d314c805e222675e SHA-256: 2fbf7274c9e1537ba4f1fcd7e4c9e539a033b239e69d2764a25bbc26c7193d6e

270 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 PowerShell T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

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 multiple URLs, including 'https://karmapedia.com/wp-includes/X0PZpQ/'. The reconstructed command line indicates the use of 'regsvr32.exe' to execute downloaded components, a common technique for Emotet. The ClamAV detection further supports the Emotet family attribution.

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://karmapedia.com/wp-includes/X0PZpQ/
- http://webnatico.com/wp-content/upgrade/AMnS3zau6FvzG/
- http://moveconnects.com/item-immo/5NAtMXXCkzQ5NrX3z/eTD8Fbu3JSWQ/
- https://mustknew.com/lovecalculator/i/
- https://baicc-ct.org/wp-admin/E6Z5DApRJ/
- 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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