Emotet Office (OOXML) / .XLSX malware analysis — malicious · 7f355128affde9bf

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c5b75bf474358128d9b52f23e184cad5 SHA-1: 4b538830a3caaa393d82ab3ec4ba5aeba16ca175 SHA-256: 7f355128affde9bfb9b957cdfe4b8df77f5b28f23f09c0c7c751569cb8b26ce6

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 sample is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetRed02221-9938910-0, indicating it is likely an Emotet downloader. The presence of a Workbook_Open macro and CreateObject calls strongly suggests malicious VBA code execution. The obfuscated DOC BODY content contains commands that reconstruct to `wscript.shell -e

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` `015732ef64fbcb08e1dc787fcae8b5237b671ded661c41bd626378f20207191c`	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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