Emotet Office (OOXML) / .XLSX malware analysis — malicious · 40c2598506985a05

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: dc9517a1b2cdbeeeeef82d953cc4ff6c SHA-1: d8912efe671920d1d291b09a5fc29c791b75f4cb SHA-256: 40c2598506985a05f55fd16b1fc5262e40e0da50e0b8caa5d48060a65bb1e28f

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic

The file is detected as Emotet by ClamAV and contains a Workbook_Open macro, indicating an attempt to automatically execute malicious code upon opening. The embedded VBA script utilizes Wscript.Shell to create and execute batch and VBScript files. The batch script contains heavily obfuscated PowerShell commands, including a reconstructed URL: "http://sumedahonline.com/wp-content/HyzNXJ30XQEBSRH/", which is likely used to download a second-stage payload. The presence of these elements strongly suggests a downloader functionality typical of Emotet.

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` `61fec236c48fbdd4394bca0147b6404511c03c8ed254a378ef452df7a51863d3`	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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