Emotet Office (OOXML) / .XLSX malware analysis — malicious · 25c89531b8957b0d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: fae556f82e7b3a201d6a38f7f50bd18b SHA-1: 29260e2b927a3b5f732758d6094b88090319d21f SHA-256: 25c89531b8957b0dba57de87639862699e637099aa8d2d6eeef41cac9449e29b

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetRed02221-9938910-0', indicating it belongs to the Emotet family. The presence of a Workbook_Open macro and CreateObject calls strongly suggests malicious VBA code execution. The script attempts to download and execute a second-stage payload from multiple URLs, including reconstructed URLs like 'http://harperhouseproducts.com/Merchan2/ARSf1LIcOauhH1rDiR/', and saves them as 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'.

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` `3499e22ec005fff2025d8c39d653e3a95fbfa1675a877e57644e138a8a6469ac`	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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