Office (OOXML) / .XLSX malware analysis — malicious · 58b38775f655498b

MALICIOUS

Office (OOXML) / .XLSX

654.5 KB Created: 2025-03-03 14:02:33 UTC Authoring application: 16.0300

MD5: 100cd9d907e986ba8d5fc6d0488557d9 SHA-1: ca85284ea6ff1d453eaee43dd2c20f913ba4200c SHA-256: 58b38775f655498b134ce8cd52ab0aba05b710f7611e41cbdffdc3597c5d5f3d

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an OOXML spreadsheet containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() and CreateObject() calls. This indicates the macro is designed to execute arbitrary commands or download and run additional payloads. The document body text, while containing product information, includes a prompt to enable macros for correct display, serving as a social engineering lure. The presence of these elements strongly suggests a macro-based malware delivery mechanism.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
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.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `d56704a0146026398bb4e1272fedb44bba1d1bed2d686b7a89e79d70da13bbf2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `43a4714a5dd2441e45a67ce84b9c1a79f91c3afd870656b1d562fc38f1f8bdd0`	vba-project	OOXML VBA project: xl/vbaProject.bin	23552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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