Emotet Office (OOXML) / .XLSX malware analysis — malicious · 84b180ad69dcdf6d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 4d1b804df658c4cef951c6b2fd058622 SHA-1: b056b56fc6b9c4fc9e81440712e5df7191a3352f SHA-256: 84b180ad69dcdf6d978fb8d7f6cd187c9b835e8eca7bf4157a36ff61d5bfb56a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an Excel document containing a Workbook_Open macro, a common technique for Emotet. The macro executes a batch file and a VBScript, which in turn downloads and executes a second-stage payload. The script attempts to download from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVCBRH/', which is reconstructed from obfuscated string concatenation. The ClamAV detection name further supports the Emotet family attribution.

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` `a04a17abbae39e31def23bc1073fa8964b22f06bebc3e8249021c735bbc24fca`	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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