Emotet Office (OOXML) / .XLSX malware analysis — malicious · 8c9ba1ae36b948b1

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 810d1dd243104257ded15921bf6e4264 SHA-1: 7fb6f399ff770adcfe5319a18a2f620113059580 SHA-256: 8c9ba1ae36b948b192828a1d5d1755d7add8b079d21c07c191a303c588cfe234

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is detected as Emotet by ClamAV and contains a Workbook_Open macro, indicating it is designed to execute malicious code upon opening. The embedded script contains obfuscated PowerShell commands that attempt to download and execute a second-stage payload from multiple URLs. The script also constructs a long, obfuscated PowerShell command string that appears to be responsible for downloading the payload, which is reconstructed as: 'hell -e&echo YertyDSrfGfHFTGUfHdghDfHxdgW4ehfgh78dfHDRgdsFhdfghdFBGDFnnctfGuiyfiJUCFdHdrGdhf'.

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` `485a53abf40b1f5d6c33544bcab561ae23a78a464d1743c41375d234b22f07da`	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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