Emotet Office (OOXML) / .XLSX malware analysis — malicious · 34c02f2d3bfda77d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 0af8d8ffb9eab97a5ecb5b1669c1606b SHA-1: c82ab1dc6ed806d179507b28db224ce319b8d013 SHA-256: 34c02f2d3bfda77d37046b176c30d14feb462b0c41b21cb60ac64542c1eb668c

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is an Excel macro-enabled document that triggers a Workbook_Open macro. This macro uses CreateObject to execute a series of commands. The primary intent appears to be downloading and executing a second-stage payload from multiple URLs, including 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauhH1rDiH/', and saving it as 'c:\programdata\yhjlswle.vbs'. The embedded commands also attempt to execute 'c:\programdata\ughldskbhn.bat'. The ClamAV detection name 'Xls.Downloader.EmotetRed02221-9938910-0' strongly suggests the Emotet family.

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
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` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 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` `f2fb393b8cbda5718d4ea9865f7572303cddffc9acbaa89b8ed62dc8c60bf70f`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 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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