Emotet Office (OOXML) / .XLSX malware analysis — malicious · 928520b18f4002e9

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 05b4c4e2ee445efd2f01ddb6a53ee057 SHA-1: 08ac5831cec422ad72a42af3871f173f0550773c SHA-256: 928520b18f4002e9f5fcc6258b4e5a593477b8591ce57e21707a3262b8558baa

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0'. Static analysis reveals the presence of a Workbook_Open macro, which is a common Emotet delivery technique. The macro contains obfuscated PowerShell commands that attempt to download and execute a second-stage payload from multiple URLs. The reconstructed PowerShell command includes the following URLs: 'http://sumedahonline.com/wp-content/HyzNXJ300XQVBSRH/', 'http://divachintexile.com/wp-inculdes/WBhWRKs8KvNzNfM/', 'http://hotelanalmabalo.com/1520/bUd hEpdf/', and 'http://shwenantawin.com/copma/XTnZJii02vfg'. Additionally, it attempts to write batch and VBScript files to 'c:\programdata\jledshf.bat' and 'c:\programdata\tghklsd.vbs' respectively.

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` `bd34b41302e1133b693c64223bf67c93d9828a9e1cbc0ccceea9342fc2c15a58`	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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