Emotet Office (OOXML) / .XLSX malware analysis — malicious · b85f9b3790fc52ff

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: ad697afb6ce020a9a57b2781d1ccc0a4 SHA-1: ce1dfd97feb0c380a6da71b9bb5417b5c242e3f2 SHA-256: b85f9b3790fc52ff2bf2d099884002edb2160665b851f87a58336ca47c72080d

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 identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0', indicating it belongs to the Emotet family. A Workbook_Open macro is present, which is a common technique for Emotet to execute its payload. The macro attempts to create and execute a batch file at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\tghklsd.vbs'. The script also contains a long, obfuscated string which reconstructs to multiple URLs, likely for downloading a second-stage payload. The reconstructed URL is 'http://sumedahonline.com/wp-content/HyZNXJ30XQEVcBRH/.,http://divachintextiles.com/wp-incudades/WBhWRKs8Kv6NfM6/.,http://hotelalandmalabo.com/1520/bUdhoEPdf/.,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` `b2c889c7cec73a97fdfc832f481f5f9ae669f6194c2955c2776e91e8087f5e94`	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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