Office (OOXML) / .XLSX malware analysis — malicious · d6e688a0eb818ca2

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 1eda9b3ec25b73ced9676155d01b1b96 SHA-1: 12cdcb23ad5061ce2693dacec18ce2a329064888 SHA-256: d6e688a0eb818ca27024de87af45c09bc983cf47c3c0f6e04fec154603358dc7

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 reverse shell, and suspicious extracted artifacts. The macro's obfuscated code and the use of `CreateObject` strongly suggest an attempt to download and execute a secondary payload. The `Workbook_Open` macro is a common delivery mechanism for malware, allowing it to run automatically when the document is opened. The extracted VBA code attempts to establish a service, likely for command and control.

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` `b53de59177a3931191904afceb6f901b733d7e59ae169b99795a609016082013`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3572 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` `ba3b46c2844e13c54acad7f0a138fa9aae59a3025bafb1f8a05596d942ff70c6`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 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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