Emotet Office (OOXML) / .XLSX malware analysis — malicious · 8de4bded31a5bf66

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e36a29312d07e605ae3a06c6950574a9 SHA-1: 3119735599374fbddc53cfd047319ae977a049b5 SHA-256: 8de4bded31a5bf66c8ee64cdce48695678d849d0aa4dfe1020d6777cacd2c9b3

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is identified as malicious by ClamAV with a signature indicating it is an Emotet downloader. The presence of a Workbook_Open macro and CreateObject calls strongly suggests malicious intent. The macro attempts to download and execute a second-stage payload using obfuscated commands, including the reconstructed URL 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauh1rDi' and saving it as 'c:\programdata\yhjlswle.vbs'. The obfuscated commands also include multiple alternative download URLs.

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
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` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 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` `287c2519aede66d5123a5723cccbec970b4aab372502da647f01058fec7feced`	vba-project	OOXML 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.

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