Emotet Office (OOXML) / .XLSX malware analysis — malicious · b4d291b8b8f5a5c0

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: fa317eac9db5ba8884ab9489da0e8d32 SHA-1: caa28e71e769a7ab67ede95ce2740bb201df7bce SHA-256: b4d291b8b8f5a5c0bcb2bf2f6bff5489ecf36de95c237cc307ae7ef948c62de3

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The sample is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetRed02221-9938910-0', strongly suggesting the Emotet family. The Workbook_Open macro and CreateObject firings indicate that VBA code is executed upon opening the document. The embedded DOC BODY contains obfuscated commands that reconstruct to 'wscript.shell' and execute a VBScript from 'c:\programdata\yhjlswle.vbs' and a batch file from 'c:\programdata\ughldskbhn.bat'. The script also attempts to download payloads from multiple URLs, including 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauh1rDrIAh/', which is a clear indicator of Ingress Tool Transfer.

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` `e73b58327e0e0d92b2b074f23ef6c9e4497080b0a366fd0359533372ec26737b`	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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