Emotet Office (OOXML) / .XLSX malware analysis — malicious · 98f0175cdca271af

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 90ed10255fad0911cd66c2654ffdac20 SHA-1: fff81e25fcab655a1c018a47ffa03f17b23e2839 SHA-256: 98f0175cdca271af353f1e6ad76ed76e54a9fb4bffd6e7bfeb354ea7f0fa40e3

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is an Excel document containing a Workbook_Open macro, identified as malicious by ClamAV and heuristics. The macro executes a batch script and a VBScript, which in turn reconstructs and executes a PowerShell command. This PowerShell command downloads a payload from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/', 'http://divachintextile.com/wp-inc ludes/WBhWRKs8Kv6NfM6/', 'http://hotelanalmabola.com/1520/bUdhEPdf/', and 'http://shwenantawin.com/copma/XTnZJi02vfg'. The presence of the Workbook_Open macro and the download functionality strongly suggests a downloader, consistent with the Emotet family.

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` `ae0d47409dac8c7952660620e20af5a6ee56ca59dd3fbcf2ba6e2d07b1c6ae5d`	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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