Office (OOXML) / .XLSM malware analysis — malicious · 80367bbe1da56a9c

MALICIOUS

Office (OOXML) / .XLSM

78.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300

MD5: 0105485b34de26fa5bc8ddb04807aa46 SHA-1: f7eb5375985d4d367b2ef93e0332c6e6ae1e259f SHA-256: 80367bbe1da56a9c62f3ec452130216eb70e5ce9c892944a26c2c9734887d524

182 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an XLSM document containing Excel 4.0 macros, indicated by multiple critical heuristic firings including the use of dangerous API functions like HALT. The macros appear to construct a URL, "http://sankhyasol.com/field.tp", and attempt to download and execute a file named "..\sdhind.exe". This indicates a downloader or droppper functionality.

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 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 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`emf_00.emf` `ab58818ae1864807b22f8a58a75f7fa8703ecb19a2352bdb47469f366b868e59`	ooxml-emf	OOXML EMF part: xl/media/image7.emf	1108 bytes
`xlm_sheet_00.xml` `b0e85f6bacf2890dc468a4764fcbce58b394ed7e564bc0b3da61c56304c19129`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1191 bytes
`xlm_sheet_01.xml` `306ff6a7899a074e0a012be462c396a92105fbe2e1be1a05082e864765645191`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1977 bytes
`xlm_sheet_02.xml` `18d2ba72cca43907b6d94db49251f3b93c6db105d752d00819dcdc7382d0f43f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.xml	993 bytes

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