Emotet Office (OOXML) / .XLSX malware analysis — malicious · cb1be4ff13bf6f03

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 17dddd9a3d57723155b56e4ce296e6be SHA-1: 92ac5204b1c8afa44f6ad14041ddd1d69c879efc SHA-256: cb1be4ff13bf6f03e6e4193dcdc58e6ff06b7c6539844c463f0e360038270330

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0', strongly suggesting the Emotet family. The Workbook_Open macro and CreateObject heuristic firings indicate that VBA code is executed upon opening the document. The embedded VBA script contains obfuscated PowerShell commands that reconstruct multiple URLs, including 'http://sumedahonline.com/wp-content/hyeNXJ30XQFEVBCBRHG/', 'http://divachintetexiles.com/wp-inculdades/WWhWRKs8KvNzNFm6/', 'http://hotelalandmalabol.com/1520/bUdhEPdf/', and 'http://shwenantawin.com/copma/XTnZJii02vfg'. These commands are designed to download and execute a second-stage payload, likely from one of these URLs, and also create batch and VBScript files in the 'c:\programdata\' directory.

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` `0757ab256f6f722666833b75d76d5092841d710e59fd2857e5773d430eca263d`	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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