Emotet Office (OOXML) / .XLSX malware analysis — malicious · 4650ec8a40b8e9d6

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 98a05537fb2d87a862751e24a7ca7a95 SHA-1: d3dfbd9a175176cfb62c6a78642bf519ae8e1e7b SHA-256: 4650ec8a40b8e9d6fdd22b66bde675b13a8d4b185e582186a4bb18286efc83a8

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

This document contains a Workbook_Open macro that executes obfuscated PowerShell commands. The PowerShell script is designed to download and execute a second-stage payload from one of the provided URLs. The script also attempts to create batch and VBScript files in the 'c:\programdata' directory. The presence of these elements and the ClamAV detection strongly indicate a downloader, consistent with 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` `6555dd6a5ade6e33bff2ffc5de43387e8cc8cd381f4531576932a12255272e33`	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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