Emotet Office (OOXML) / .XLSX malware analysis — malicious · e6dbde13c0104a7f

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b57c553e2cb445b29a3b2274eec37021 SHA-1: ef025508d8b96011b7c1b15a3c3582ad83877ef6 SHA-256: e6dbde13c0104a7fb2fce77f3a26d7be94665ee8a5cf89b29ccf935c9119b7c7

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 an Excel document containing VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for Emotet. The script uses CreateObject to execute shell commands, including the reconstruction of the command 'po wershell -e [base64 encoded string]' which is used to download and execute a second-stage payload. The script also attempts to write a VBS file to 'c:\programdata\yhjlswle.vbs' and a BAT file to 'c:\programdata\ughldskbhn.bat'. Multiple URLs are present in the script, likely serving as download sources for the payload.

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` `b9d398734cbe59802dd20051b502c843ff709ce440e04244d0430d5dac3565d7`	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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