Emotet Office (OOXML) / .XLSX malware analysis — malicious · 7b4fbb18d2a12cbb

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 0ae1ac274caebbb34e964f54c31cd31b SHA-1: 2fd1a9cedfd363a27ac02336ca7e81f423862f2b SHA-256: 7b4fbb18d2a12cbb94a440b1377478b8d84a315d27704d00cfaaa0e1f5bfe3db

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetExcel02223-9938902-0, indicating it belongs to the Emotet family. The presence of a Workbook_Open macro and CreateObject calls strongly suggests an automated execution of malicious code upon opening the document. The embedded script attempts to download and execute a second-stage payload from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBRH/', and writes batch and VBScript files to disk.

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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