Office (OOXML) / .XLSX malware analysis — malicious · 35c6702312324536

MALICIOUS

Office (OOXML) / .XLSX

193.1 KB Created: 2021-06-07 05:09:40 UTC Authoring application: Microsoft Excel 16.0300

MD5: fdeff7b57d4be10e818d15cc03a32b24 SHA-1: e9aec8fdf233e2314d4ecd8acecfa5461078ce7f SHA-256: 35c6702312324536c0cb20bfc4109d931591824cad927c5bb3120443c297ee23

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The presence of a Workbook_Open macro and a CreateObject call strongly indicates that the embedded VBA code is designed to execute automatically upon opening the document. This macro likely attempts to download and execute a secondary payload, a common technique for initial access. No specific IOCs like URLs or hashes were extracted, but the behavior is characteristic of a macro-based downloader.

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` `05fc3400b1b94f5855afe98140a81fcd5e3169f048ddd203cc01daa19ede7f03`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3998 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `d259f4bcaf370b7ac893d32e2c74cb84a9ccee4b5d42cc5fa0f03bff91df177f`	vba-project	OOXML VBA project: xl/vbaProject.bin	19968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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