Emotet Office (OOXML) / .XLSX malware analysis — malicious · b5fe262f0f4bf655

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b09f980e360f265350bff7a419580639 SHA-1: a2de1ce9877e308392ac2cebde038a42324aedca SHA-256: b5fe262f0f4bf65530a653a3208e6c4a383d9dd5771a6c6cf953a61176ce5358

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls strongly indicate malicious intent. The embedded VBA script, specifically the 'FHsdrghkldsSeErhoihsw' subroutine, contains heavily obfuscated PowerShell commands. These commands are designed to download and execute a second-stage payload from multiple URLs, including 'http://sumedhaonline.com/wp-content/HyzNJ30XQFEBCBRH/'. The script also attempts to write to the file system at 'c:\programdata\jledshf.bat' and 'c:\programdata\tghklsd.vbs', further supporting the downloader functionality.

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` `6fcaec06b2f5b2f90b371a8a8f655ec4a1ff9aea7bf8cf5e1a4bc330da245124`	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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