Office (OOXML) / .XLSM malware analysis — malicious · 1c7221d77aa0958f

MALICIOUS

Office (OOXML) / .XLSM

76.5 KB Created: 2020-12-21 14:26:55 UTC Authoring application: Microsoft Excel 16.0300

MD5: 1aca4384a5da9c2a44745642382a981a SHA-1: fe3ec1e8cc8e87c1dc0606111d47bf27c7f74b3a SHA-256: 1c7221d77aa0958f77bc4796b0b1c09f4c781e877ee18a3c9627c440ef72233d

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLSM file contains Excel 4.0 macros, indicated by the 'OOXML_XLM_MACROSHEET' heuristic. The VBA code within the 'macros.bas' module appears to be obfuscated but contains calls to functions that likely reconstruct and execute commands. The 'tprint' function, in particular, seems designed to download and execute a second-stage payload. The presence of hidden sheets ('OOXML_HIDDEN_SHEET') further suggests an attempt to conceal malicious activity.

Heuristics 4

Excel 4.0 macro sheet (2 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.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 2 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://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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `2d6c061756b7306c7e06aefa8432027f6491cc60fc55bef04c23752be7573cab`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2001 bytes
`vbaProject_00.bin` `491a51c549dff91def4f1e43fc5c714083570038b36e39df07bd7f9b5822c955`	vba-project	OOXML VBA project: xl/vbaProject.bin	19456 bytes
`emf_00.emf` `068b1b5475127332c13ed6c07f9f55ab2bbf3b5b1b0ac4caa9d13171780bc214`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	2024 bytes
`xlm_sheet_00.xml` `0bf3c2219a3e39328639b0e047b6a83c94de7b566a86a1765457df9020930c58`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	871 bytes
`xlm_sheet_01.xml` `2483fefa619af96462b0925b98affebdb171f0325c39e894d910a15a17412fab`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	986 bytes

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