Emotet Office (OOXML) / .XLSX malware analysis — malicious · 250be6c7524b6d39

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: cbdf392bfd88446f7d55d51dd71656d6 SHA-1: 59e4893a5869c8f2cb40608a64890dad38778f6e SHA-256: 250be6c7524b6d39ec278487523b0762203cb7b1da9b91c08c8807ed41d9f50d

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains a Workbook_Open macro that executes a PowerShell command. This command is heavily obfuscated but appears to download and execute a second-stage payload from multiple URLs. The presence of the ClamAV detection for 'Xls.Downloader.EmotetExcel02223-9938902-0' strongly suggests this is an Emotet variant. The script also attempts to create batch and VBScript files in the 'c:\programdata\' directory.

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` `e76123d7a12c0c7fb5d066aba981c9baf3eed8c91311608589ff3f6c4f8dfb54`	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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