Emotet Office (OOXML) / .XLSX malware analysis — malicious · 9b1c9dec8356f787

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6ba55203bc897c9a63d313f5776acaad SHA-1: 3ca6df1fc1bfda70161a1d9411a8469be2fe7009 SHA-256: 9b1c9dec8356f787be606bfbbc2fa5288320e6151d23c07e4b9da8136975ad71

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.EmotetRed02221-9938910-0'. The presence of a Workbook_Open macro and CreateObject calls indicates that the VBA code is designed to execute automatically upon opening the document. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://harperoproducts.com/Merchandise2/ARSf1LIcOauhH1rDrIH/', and saves it as 'c:\programdata\yhjlswle.vbs'. The script also constructs a batch file 'c:\programdata\ughldskbhn.bat' which likely executes the downloaded VBScript.

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` `4ead12ff3eff3608c10b3cfe35964f9b2f249b135bee262f0f1af0f4338887e9`	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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