Office (OOXML) / .XLSM malware analysis — malicious · 52dc772f8a1fba5d

MALICIOUS

Office (OOXML) / .XLSM

18.7 KB Created: 2021-03-09 00:03:12 UTC Authoring application: Microsoft Excel 16.0300

MD5: 7e7b8a3f709a06751a5aebf0727299f9 SHA-1: 42e6d1c6c78d3c7e201e49de22a18362b4ee5f71 SHA-256: 52dc772f8a1fba5d23b2bd62f1762d49f180579d561bbb64d84f97f4c3a7b2cd

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an XLSM document containing VBA macros, with a critical heuristic firing for a Shell() call. The presence of a Workbook_Open macro indicates that the malicious code will execute automatically when the document is opened. The script likely downloads and executes a second-stage payload, although no specific URLs were extracted. The primary attack pattern is macro-based execution of arbitrary commands.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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
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` `baeda77b66da0ae689a16d98ef6b819a87316480ab6467ac2cd9d87b8f36e3f6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	38875 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` `4bc34f8e6c990c02f4d07b86e12269833bb2b02e4e678b52aa76cc0b8b0ffd82`	vba-project	OOXML VBA project: xl/vbaProject.bin	43008 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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