Emotet Office (OOXML) / .XLSX malware analysis — malicious · b23cb92b9d589e61

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: eb258b86822d002c7bf57c98a573a667 SHA-1: bc404918ef622e4d48b97a14e51bfdbfe59177fc SHA-256: b23cb92b9d589e61aa94716500cf7b0133539afe36b8013cdb8876575997e0d5

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

This Excel document contains a Workbook_Open macro that executes a batch file and a VBScript. The batch file appears to be responsible for downloading and executing a second-stage payload from one of the provided URLs. The VBScript also contains obfuscated PowerShell commands that are likely used for downloading and executing further malicious content. The ClamAV detection strongly suggests this is an Emotet variant.

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` `573621ba1ef1f80830cacc07ddd0ecf9cb9912ea80be2467c4b18dfe1959bc6c`	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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