Office (OOXML) / .XLSM malware analysis — malicious · 8df57c1b7342ee49

MALICIOUS

Office (OOXML) / .XLSM

106.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 14.0300

MD5: 7673485eed081c429ca4b325598da680 SHA-1: 81ac796f34838b65645cba16839f57e938701814 SHA-256: 8df57c1b7342ee49a0b7cb45a94c7eb301567c92578853722205e931d474f3d5

180 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Macro T1059.005 Command and Scripting Interpreter: Visual Basic T1218.011 System Binary Proxy Execution: Rundll32

The sample is an Excel macro-enabled spreadsheet (XLSM) containing Excel 4.0 macros. These macros utilize dangerous functions like EXEC and CALL, which are known to download and execute payloads. The document body explicitly contains URLs that are likely used for this purpose. The presence of Auto_Open defined names further indicates an attempt to automatically execute malicious code upon opening.

Heuristics 4

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: HALT, CALL, FORMULA, WORKBOOK.HIDE 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.
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://specialentrydarshan.online/rGbzLPZQ2NS/haart.html
- https://nowfoundation.org.uk/HX0sMMMbiw/haurt.html
- 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `77506dd6876315d017d43b59005773cca1964b7092bf13f77a293c8436fa81b3`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	805 bytes
`xlm_sheet_01.xml` `d58cfd326d0c9337ad8afba611af4e0b433ba8da73c78792d237ba56aea22a55`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	4030 bytes
`xlm_sheet_02.xml` `d91313200f1c58d9c6d9061b20363ae82b8152777db3c0184419fd94b7f46c54`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	206530 bytes

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