Office (OOXML) / .XLSX malware analysis — malicious · a0747e6e54af1fde

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 56d9a0db8defe0857dd4bb7c9af97ee2 SHA-1: abf0d796220d5e8ba7a5cc3f5ed2421411a5fb56 SHA-256: a0747e6e54af1fde0586add639282d26b5e22a0bb4e4cca5d362c6eb6f6f3ed4

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 on workbook open, a CreateObject call potentially used to establish a command-line interface, and the presence of a VBA project file. The macro's behavior, combined with the extracted URLs, strongly suggests a macro-based downloader attempting to execute a payload. The `Workbook_Open` macro is a common delivery mechanism for malware, and the `CreateObject` call further supports the intent to establish a command-line interface for executing the downloaded 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` `3921d28822ce27ea60b054806975387fb6bcc1cd36b745a1ce8f9e21b957c577`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3349 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` `bf724c950bf872372d67777b64a3dd44598b4c9fdd07ffe986b2c5374a304251`	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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