Emotet Office (OOXML) / .XLSX malware analysis — malicious · 2679b25890903426

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 811a11e26790e31498f69d189d5ccdc8 SHA-1: 0c5280fa02c7d459e21bda38399f7be1039f0698 SHA-256: 2679b25890903426ad50ebf5c7a68a22ef1589c329f400ada1017fe71be7f5ca

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing with Other Weapons T1204.002 Malicious File

The sample is a macro-enabled Excel document that triggers a Workbook_Open event. This event executes obfuscated PowerShell commands, which are designed to download and execute a second-stage payload from multiple URLs. The presence of the Workbook_Open macro and the obfuscated PowerShell execution are strong indicators of Emotet activity.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
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

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 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` `889fc181d29258cc9f7dad6500c5c683510fd4058e1501eecd4ef319c649c3ba`	vba-project	OOXML 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.

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