Office (OOXML) / .XLSM malware analysis — malicious · f27ec7197b7e5215

MALICIOUS

Office (OOXML) / .XLSM

879.7 KB Created: 2014-08-18 08:57:48 UTC Authoring application: Microsoft Excel 15.0300

MD5: 2eebe2bf04283ad26197369a359bea98 SHA-1: e50bcff590abd4cea3b8391511cefe16fa10bbc7 SHA-256: f27ec7197b7e5215cbcce1c1d56c9acbe31bf3d6ad3a33e636a8348676692ffa

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

This XLSM file contains a Workbook_Open VBA macro, which is a common technique for executing malicious code automatically when the document is opened. The presence of CreateObject calls and embedded OLE objects further indicates malicious intent. The macro likely downloads and executes a second-stage payload, though the specific details are not available from static analysis alone.

Heuristics 5

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
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f813c7d02e38c7caee65002beba351bda040bace4414bcff3e0a991b06a69f4f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	473787 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`ooxml_oleobject_00.bin` `9250bceb3001c34c883726466bb82035850b104ba39e1d2dbde5f759c49fd637`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Microsoft_Word_97_-_2003_Document1.doc	31744 bytes
`vbaProject_00.bin` `a2f46a257ccdfea68190edbcbcc4fa9ee53ce90e8a3602a58aec0177b7a9a82d`	vba-project	OOXML VBA project: xl/vbaProject.bin	1505792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`emf_00.emf` `2596b446726e5518313f61ff1220832637cea80e74b44e012ae5f2da158af4ed`	ooxml-emf	OOXML EMF part: xl/media/image1.emf	26536 bytes

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