Office (OOXML) / .XLSX malware analysis — malicious · 95f32399edd3c82b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b3144e44e58755333a3ca39b805a1e08 SHA-1: 15e891fbc55be0efa9698fa02964794de4254ca6 SHA-256: 95f32399edd3c82ba41c16c6eb8f745ebd7f7f7677527272c2215d1160c92a83

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` calls, which are commonly used to instantiate COM objects for executing commands or downloading payloads. The `Workbook_Open` macro is a standard entry point for malicious macros in Excel, and the extracted code demonstrates a simple message box, likely a distraction or to mask the true intent. The presence of a VBA project file suggests a deliberate attempt to hide the malicious code. The overall pattern is consistent with a macro-based downloader or a delivery mechanism for a more complex payload.

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` `ad94424034e737f808553c11f537e8a14d4b76683fd1b705f2471e9c7fc7b5c9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3579 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` `24d77cfec8489d76ecfa0113c661ded4e7cf61575f4609c4174522ebf2d9508e`	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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