Office (OOXML) / .XLSX malware analysis — malicious · cfee90218720f314

MALICIOUS

Office (OOXML) / .XLSX

15.9 KB Created: 2021-05-06 09:43:15 UTC Authoring application: Microsoft Excel 15.0300

MD5: 11e9376ee19889ee5c08e816b1d3b231 SHA-1: d22b56bedc58de7da73d647a5f3048b9cabc17d7 SHA-256: cfee90218720f31491495dd353027017808fb3b9524d6c86ddfd016a372f627c

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The file is an Excel macro-enabled document containing a Workbook_Open macro, indicating it's designed to execute malicious code automatically when the document is opened. The presence of CreateObject calls further suggests the execution of arbitrary code, likely to download and run a secondary payload. No specific family could be identified.

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` `ecb30d8259e5b3c3e6cf08c8b9dfa7e9793ce97d22f2f957a09710e1df896d3f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4646 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` `99f34b872b2c63435dfedd164538bc71338a877488dd627304a78bf0f4a0f440`	vba-project	OOXML VBA project: xl/vbaProject.bin	21504 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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