Office (OOXML) / .XLSX malware analysis — malicious · 8bc467b916322422

MALICIOUS

Office (OOXML) / .XLSX

212.9 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: f58eff64328ec2a2619ff8f81363f95b SHA-1: cd403d0556692e60d76d722a19a5bc2d17850e6e SHA-256: 8bc467b91632242290d71490826416691e4af77fd5e56e68946ec3ec44c8bbc3

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Remote Services - SMB

The file exhibits several indicators of malicious behavior, including a VBA macro that executes upon workbook opening, a CreateObject call potentially used to establish a command-line interface, and suspicious extracted artifacts. The `Workbook_Open` macro is a common delivery mechanism for malicious payloads in Excel documents. The script attempts to establish a connection and potentially download a payload, consistent with a downloader. The high severity heuristics further support this assessment.

Heuristics 4

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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `92e0c8b6349f0dd162bfa0803ef7031c29affa96fe575e6712302aff1f289984`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3502 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` `8528d12ecc5a75a13284175ae4218e20d938a525050f7f8c2babd074ac6660d5`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 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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