Emotet Office (OOXML) / .XLSX malware analysis — malicious · e488e7c3a98c1df3

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 64a4845b08521349d05e73eca89507b0 SHA-1: f5481e75d452dea185d4fe15d14462d19de2ab92 SHA-256: e488e7c3a98c1df3d1d492d57a71539f119ae9128cbc8fc56e6999f0266571c7

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell

The file is an Excel document with a Workbook_Open macro, a common delivery mechanism for Emotet. The macro uses Wscript.Shell to create batch and VBScript files, and the embedded script attempts to download a payload from multiple URLs. The reconstructed URL is "http://sumedahonline.com/wp-content/HyzNXJ30XQFEBSBR/ , http://divachintextile.com/wp-incluedes/WBhWRKs8KvNzNFm6/, http://hotelalandmalabol.com/1520/bUdhoEPdf/, http://shwenantawin.com/copma/XTnZJii02vfg". The ClamAV detection also strongly suggests Emotet. The script's obfuscation makes it difficult to fully determine the exact execution flow, but the intent to download and execute a second-stage payload is clear.

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` `cdb0dd2cf2b1849745e12ee3290cf707ae15cd552a33c94df35851b1e9ca1a23`	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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