Office (OOXML) / .XLSX malware analysis — malicious · ee4cdfef12991454

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: a46558b1e3059e8f9fd03cddedaec16b SHA-1: 70f1e56e0691be8d4f7a52ad25bd9a6da034deaa SHA-256: ee4cdfef12991454dd893fbf83e7cac2a5f29e60bfa9ed2a7f1e78d9e69bceb2

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing

The file exhibits several indicators of malicious behavior, including a VBA-based macro that executes upon workbook opening. This macro utilizes `CreateObject` to instantiate COM objects, potentially for downloading and executing a secondary payload. The `Workbook_Open` event handler is a common attack vector for delivering malicious code. The extracted artifacts, `macros.bas` and `vbaProject_00.bin`, further support this assessment. The obfuscated code and the use of `MsgBox` suggest an attempt to evade detection.

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` `0309f331c5b8e9ee4dc46db1396fcbc811e575c0b9baab6299f5bfeed2aae8f5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3545 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` `53193c1f46e69836e1831220747f01399fc0773fdf2d7f755930eb81c4e9fa1c`	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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