Emotet Office (OOXML) / .XLSX malware analysis — malicious · e134be8e8d06750e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 534f748768d017ec412010dcd80c5f77 SHA-1: 1dba2090898f93011ea24d4f9ec8c128be1c41de SHA-256: e134be8e8d06750e35aa40bd07f803f10b81771922b3359bad340c42ea515d69

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

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, both located in c:\programdata. The script content reveals it attempts to download payloads from multiple URLs, including 'http://sumedahonline.com/wp-content/hYzNXJ30XQFEVBSRH/'. This indicates a downloader functionality aiming to fetch and execute further malicious content.

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` `bcadea0163fb3048fa9b0cd735e016ed4b7b78226cddf2772cab420e0e8698dd`	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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