Office (OOXML) / .XLSX malware analysis — malicious · 9f36d4190d401939

MALICIOUS

Office (OOXML) / .XLSX

87.8 KB Created: 2020-11-08 23:02:19 UTC Authoring application: Microsoft Excel 16.0300

MD5: cb32f3710e55d8bcf9b1e889c1b213ca SHA-1: eb3f670d343cd7dabfbc0457cb4bc183565d6ddf SHA-256: 9f36d4190d4019396cad5a81d5898760a0e56878b384e8ba986e1c46f11da9f7

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the macro is designed to execute arbitrary commands upon opening the document, a common technique for downloading and executing further malicious stages. No specific family could be identified, but the behavior is consistent with a macro-based downloader.

Heuristics 4

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `6301ff622a5ec63ea41a3f0d2f201ed735c8b60f9ecfa97bcde5095f2a66ec63`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2002 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` `2abfc69e3c33ec534cc26515d54464ec63fe181bd66e3ceb45f3fdc5a5360661`	vba-project	OOXML VBA project: xl/vbaProject.bin	14336 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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