Emotet Office (OOXML) / .XLSX malware analysis — malicious · b8f79898467848d4

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 9a33afc3b9283a2aaff3aeb1fd9d9596 SHA-1: 02124d9a34474ac9def43baedb7b5e9756cb731c SHA-256: b8f79898467848d48036e1bcd16b2a191884062c616298965e8cb8562ded8f76

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0'. The presence of a Workbook_Open macro and CreateObject calls indicates automated execution upon opening. The embedded script contains obfuscated PowerShell commands that reconstruct a lengthy URL string: 'http://sumedahonline.com/wp-content/HyzNXJ300XQVBSRH/,http://divachintextiles.com/wp-incudades/WWhWRKs8KvNzNFm6/,http://hotelanlamablabo.com/1520/bUdhEpd/,http://shwenantawin.com/copma/XTnZii02vfgV'. These commands are designed to download and execute a second-stage payload, likely contributing to the Emotet family's known behavior of distributing further malware. Additionally, the script references the creation of two files: 'c:\programdata\jledshf.bat' and 'c:\programdata\tghklsd.vbs'.

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` `1a38f3daac1059f4349baecaf3c30201700d6b1bf302410ad62d0dd9f1cc5a67`	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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