Office (OOXML) / .XLSM malware analysis — malicious · f46e8a34de673a2f

MALICIOUS

Office (OOXML) / .XLSM

30.6 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-03-16

MD5: abea1f7298ca0be10a4f1f8c12dcadb6 SHA-1: 9a1ad181c2980c82789c627fdd30411c8a09f4f6 SHA-256: f46e8a34de673a2f5d63a35e30e4ff564e53632937e652c58c6b4324640cfdbb

290 Risk Score

Malware Insights

MITRE ATT&CK

T1218.010 System Binary Proxy Execution: Regsvr32 T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

This XLSM file contains Excel 4.0 macros, specifically using the FORMULA API to construct and execute commands. The macros are designed to download a payload from one of the provided URLs and execute it using regsvr32.exe. The reconstructed command line indicates the use of regsvr32.exe to load a DLL from a remote URL, which is a common technique for initial payload delivery.

Heuristics 7

Excel 4.0 macro sheet (1 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: Win.Malware.Agent-9982902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Malware.Agent-9982902-0
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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://henrysfreshroast.com/6cc4ts0bkrOlXq/
- http://blog.centerking.top/wp-includes/DBq5jx/
- http://filmsetserie.dx.am/img/ghCY9J5KD1J/
- http://advogadogoiania.com.br/wp-includes/O9Az4/
- http://consejosdeorlando.com/wp-includes/jxTbRk2DgQOIOyokR/
- http://polarrefrigeracao.com.br/fontes/y7QpO/
- https://vagbharati.in/wp-admin/nYBb/
- 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `db0a59e4a9d5995912532cf04297a579397bf9cc37c53dfcf4ddd0de285133c8`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	4122 bytes

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