Emotet Office (OOXML) / .XLSX malware analysis — malicious · 8bd55b72e96b1ec5

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c55de90647aef216768b8516a3263468 SHA-1: 253eb1648ed416e8791f0465e76b3b5696276065 SHA-256: 8bd55b72e96b1ec555e05044f6a138108b35cd6f505a46951db7dd83be96f489

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 with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0', indicating it belongs to the Emotet family. The Workbook_Open macro is present and uses CreateObject to execute obfuscated PowerShell commands. These commands reconstruct a URL and attempt to download and execute a batch file named 'jledshf.bat' from 'c:\programdata\'. The script also reconstructs a second URL which is likely for a secondary payload. The presence of the Workbook_Open macro and the obfuscated PowerShell execution are strong indicators of Emotet's typical delivery mechanism.

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` `28e47fe181f696aab0a5804073394280dbd54438421cffd7ed0cd3f79f94c40b`	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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