Emotet Office (OOXML) / .XLSX malware analysis — malicious · a39e960ab8d5f2ca

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 8bb383423505bac7a0ee9a7155f9c1ce SHA-1: 32da7490f9cfabd01e114a2f3378bc00f57f3d90 SHA-256: a39e960ab8d5f2ca4a77a4107d4a24955456d38cdde0ebca750eb35357ff881f

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetRed02221-9938910-0. The presence of a Workbook_Open macro and CreateObject calls indicates that the VBA code is designed to execute automatically upon opening the document. The script attempts to download and execute a second-stage payload from multiple URLs, including reconstructed URLs like 'http://harperhouseproducts.com/Merchan2/ARSf1LIcOauh1rDIh/'. It also writes a VBS file to 'c:\programdata\yhjlswle.vbs' and a batch file to 'c:\programdata\ughldskbhn.bat', likely to facilitate execution and persistence.

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` `e487cc74aa3801c4c0a44487e5f102b32800a6dc4f00768795c08f15e56e6889`	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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