Emotet Office (OOXML) / .XLSX malware analysis — malicious · b8be791c88c26397

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b7faedae922ab601607e5459508dc206 SHA-1: cf8da4d5ec5821138e9003bc24d7b91562b99cc1 SHA-256: b8be791c88c26397f3a416cc7e9bc2aa041b1daf906d4c5f787ac8ee68cae2f8

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The file is an Excel document with a Workbook_Open macro, identified by ClamAV as Emotet. The macro uses CreateObject to execute a batch file and a VBScript, which in turn appears to download payloads from multiple URLs. The script attempts to reconstruct a PowerShell command that includes several URLs, one of which is 'http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/'. This indicates a downloader functionality.

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` `0817d25ba22c6a70457b8de3b64145a9f0260fb45ef05a87e03317407c4ed8d8`	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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