Emotet Office (OOXML) / .XLSX malware analysis — malicious · 87ddb99141466a1c

MALICIOUS

Office (OOXML) / .XLSX

91.9 KB

MD5: 682e0a90461716f377ff6c6de42a3914 SHA-1: bc5fc499458739284a22edcacddef8c021ef8c13 SHA-256: 87ddb99141466a1c2a2d3a264903aa1db8cfb1801e907ddff4e575deb19e67b5

208 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate or Obfuscate

The file is detected as Emotet by ClamAV and contains a Workbook_Open macro, a common technique for this family. The VBA code, though partially truncated, includes calls to CreateObject, indicating it likely attempts to download and execute a second-stage payload. The presence of a Workbook_Open macro and the ClamAV detection strongly suggest Emotet activity.

Heuristics 6

ClamAV: Xls.Downloader.Emotet-a5251d3d2d6d3722-9951020-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-a5251d3d2d6d3722-9951020-0
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` `086e7217b83491c5645f8eca87528d9ca02450fa766f5d53ad8e23e104d0adc9`	vba-project	Malformed OOXML local-header VBA project: xl/vbaProject.bin	37888 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` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from malformed OOXML local headers)	12808 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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