Emotet Office (OOXML) / .XLSX malware analysis — malicious · 7ce6da392a54fb94

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: bdcfce2fcafd339d5539d99831dad657 SHA-1: a43a194887b3f4203b803d28675161153d2086d1 SHA-256: 7ce6da392a54fb94eb769de616e63ff80c8b25ba726b21eb7e2550382bc37de1

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is identified as malicious by ClamAV and contains a Workbook_Open macro, indicating automatic execution upon opening. The macro utilizes CreateObject to interact with Wscript.Shell and RDS.DataSpace, ultimately attempting to execute a batch file named 'jledshf.bat' located in 'c:\programdata\'. The embedded PowerShell commands are heavily obfuscated but appear to download and execute payloads from multiple URLs. The presence of Emotet-related heuristics and the known behavior of Emotet droppers justify the family attribution and the high confidence.

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` `b7967f593a46e080c761d9b754ee11b37c94aaf89ad9d84900551a89fa2fe0dc`	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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