Emotet Office (OOXML) / .XLSX malware analysis — malicious · fb1bb1ab19421e58

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 47ca32a2303f9af599f6ae959e14edd7 SHA-1: 18450ddbb4af40a31fd3677b4313e136f5175fe0 SHA-256: fb1bb1ab19421e58831efd515a7bbaa3060cb81eb5f3d54eb0fdf79ae5382dfb

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is identified as malicious by ClamAV and contains a Workbook_Open macro, indicating automatic execution upon opening. The embedded VBA script utilizes CreateObject to execute obfuscated PowerShell commands. These commands construct a URL to download and execute a batch file, specifically 'jledshf.bat', from 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBSrHG/'. The script also attempts to create a VBScript file, 'tghklsd.vbs', in the programdata directory. The presence of Emotet-related heuristics and the download/execution pattern strongly suggest the Emotet family.

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` `d3564de33bb4ec64bd90e1b69bd6040f876b9e1bfbff616269948803d0713460`	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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