Office (OOXML) / .XLSX malware analysis — malicious · a2420c7f0c7bf5d3

MALICIOUS

Office (OOXML) / .XLSX

37.9 KB Created: 2021-05-05 21:00:17 UTC Authoring application: Microsoft Excel 16.0300

MD5: 719009a094c6f3155e7abc537078b943 SHA-1: c4b3109cf39b301b30e732db7493f3241236ed1f SHA-256: a2420c7f0c7bf5d3c0893aff6b7440a09c0531632434d2bbb6f8ed98b04317b9

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. The CreateObject heuristic further indicates the potential for arbitrary code execution. The presence of these elements strongly suggests a macro-based malware delivery mechanism.

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` `063da071d59dcb0da8fd963b10d165fb8372a068fabafbd6eb67f0f6870445e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3479 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` `3423c2d1813d3801339ae44f8b9d450bb4706711979be180cb7e54b4563efc81`	vba-project	OOXML VBA project: xl/vbaProject.bin	22528 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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