Emotet Office (OOXML) / .XLSX malware analysis — malicious · b6e2d70143ddb958

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6c1d5c5cefa79cd8b36797debe378088 SHA-1: 07e49c9a2dc2f5138e56531a033f130d18471a1b SHA-256: b6e2d70143ddb958f72287c6f246fce986f882d28748d30a81a6a439cf08206b

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0', strongly suggesting the Emotet family. The presence of a Workbook_Open macro and CreateObject calls indicates the execution of malicious VBA code. The script attempts to create two files, 'jledshf.bat' and 'tghklsd.vbs', in the 'c:\programdata\' directory. The embedded PowerShell command within the VBA script is heavily obfuscated but appears to be constructing a series of URLs for downloading and executing payloads, including the reconstructed URL: 'http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/ ,http://divachintextile.com/wp-incudades/WHwWRs8KvFm6/ ,http://hotelalandmalaab.com/1520/bUdhEPdf/ ,http://shwenantawin.com/copma/XTnZJii02vfgV'.

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` `28dd623060995425ca5429b736b98431e181f2b3f4731fdbfa612dabbecaf2da`	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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