Office (OOXML) / .XLSM malware analysis — malicious · 97c65fc5e4e6cb68

MALICIOUS

Office (OOXML) / .XLSM

158.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: 4828706cfc63ea3043b05456d2df8029 SHA-1: dafd2836f1c915451a47e7b0b320b8804f1b8990 SHA-256: 97c65fc5e4e6cb68141853ded39ca1e62b374430b80765b7f4a96244b44c58f5

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an XLSM file containing multiple Excel 4.0 macro sheets. Heuristics indicate the use of dangerous XLM formula APIs like FORMULA, HALT, and FORMULA.FILL, which are known primitives for executing arbitrary code and downloading payloads. The presence of embedded URLs pointing to potentially malicious domains further supports this. No document body text was available for analysis.

Heuristics 5

Excel 4.0 macro sheet (5 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, HALT, FORMULA.FILL 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.
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 1 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 — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL https://astronomia-esp.com/j5KMREjY4/gg.html
- https://m-morsi.com/fDpJyn0aEyCB/gg.html
- http://schemas.openxmlformats.org/spreadsheetml/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/excel/2006/main
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `fb11a6fcbb152db165d2a6724e880a02e36305b93a41677e2c485b8bc83bf634`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	11344 bytes
`xlm_sheet_01.xml` `01be081374433318ab060c7d9534b134366d414e43d756214d58deb1a7557a22`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml	1807 bytes
`xlm_sheet_02.xml` `4942d78e9a4c26c9352582ba044fbdd7b5e434ac67308d3cb59b8725b48e9b99`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml	1777 bytes
`xlm_sheet_03.xml` `a6863ce46a6a991745232b05bc1b5af380056ae05155ba24221669ae920dc1d9`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml	1460 bytes
`xlm_sheet_04.xml` `7a65a9a19541a783d2364e0cc237ab353fd49b12ac69aaaae5e6996c7d787d37`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml	1558 bytes

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