Emotet Office (OOXML) / .XLSX malware analysis — malicious · f95a49205a346260

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: ded3c00f2cc48134801e394a4f5e8197 SHA-1: 7903df0991b1bf99accf1629b70f844acb3f6a1c SHA-256: f95a49205a346260cdaaf204033aa9907f217d045588ea337baf62b70df2901d

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with a signature indicating it's an Emotet downloader. The presence of a Workbook_Open macro and CreateObject calls, along with the 'OOXML_VBA' heuristic, confirms macro execution. The embedded VBA script contains heavily obfuscated PowerShell commands, including a reconstructed URL: "http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBSBRH/", which is likely used to download and execute a second-stage payload. The script also references batch and VBScript files in the programdata directory, suggesting further stages of execution.

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` `4909974cb56c6e7d3a69160eac33525a5c28cf8d50fb16f580589cafabaa999e`	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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