Emotet Office (OOXML) / .XLSM malware analysis — malicious · 7a4262d54d42cd7f

MALICIOUS

Office (OOXML) / .XLSM

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

MD5: fa082cac71ed747ffca609a7853b261e SHA-1: 08379526fc6785dd9bc53202b5ed42026fbfb664 SHA-256: 7a4262d54d42cd7f1613128d6716a5423c57df1a66aecd2bf896b9c00a11e2e9

250 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Service Execution T1059.001 PowerShell T1204.002 Malicious Link: Malicious File T1105 Ingress Tool Transfer

The file is an XLSM document containing Excel 4.0 macros, as indicated by multiple critical heuristic firings including the use of dangerous formula APIs like FORMULA. These macros are designed to download and execute a second-stage payload from one of the embedded URLs. The ClamAV detection as 'Xls.Downloader.Emotet03220-9940726-0' strongly suggests the Emotet family. The reconstructed command 'regsvr32.exe' indicates a likely execution vector for the downloaded payload.

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.Emotet03220-9940726-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet03220-9940726-0
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 http://onlinebrandedcontent.com/l55mri/Pl9TE5LYUHTCpuglHEkP/
- http://acceptanceh.us/portal/e6Ga3Y9/
- http://gloselweb.com/XFRV7L84/Gtb9BR0M/
- https://onlyfansgo.com/ofoed/ZHGzF/
- http://www.marcoantonioguerrerafitness.com/wp-content/Gzza9KkuuCa/
- 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` `c2beed76b90707ab99d3556b095847fbe67565665bab2978d4d40d1b769c68e7`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	4017 bytes
`xlm_sheet_01.xml` `3f1e04bcb932a0d7a0ca09ad6e05d398d7a144c4cda86314010c0ec3e9f94573`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1278 bytes
`xlm_sheet_02.xml` `3877aa64e871d2d6fcc766f5b3af64ba0d301f656023d2e6e43652b8210d827c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1152 bytes

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