Office (OOXML) / .XLSX malware analysis — malicious · d238d70c8fb7e319

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB

MD5: d56121f8d17030cbb119e2ae6a6ea919 SHA-1: e0e33e9413e64de2d0520c96198c211c6ff6e015 SHA-256: d238d70c8fb7e319bbcf7fe2a9bac2162a109a83cea8e86ccd24bcbde0188410

148 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The file is an OOXML XLSX document containing VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. The VBA code includes a CreateObject call and appears to be designed to manipulate the Excel application, potentially to download and execute a second-stage payload. The presence of a Workbook_Open macro and a CreateObject call strongly suggests malicious intent, likely for further infection.

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

Malformed OOXML local headers contain vbaProject.bin — VBA macros present
Malformed OOXML package with recoverable local headers low OOXML_MALFORMED_ZIP_LOCAL_HEADERS

The OOXML ZIP central directory is invalid or missing, but local file headers expose a recoverable Office package. This can create parser divergence between tolerant Office/ZIP readers and scanners that rely only on the central directory.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`vbaProject_00.bin` `b42fc5f6a6da4b6c896c1c0d4d704fb52080c1f5388fbcac80c2973e0a63e5fb`	vba-project	Malformed OOXML local-header VBA project: xl/vbaProject.bin	42496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from malformed OOXML local headers)	12041 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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