Emotet Office (OOXML) / .XLSX malware analysis — malicious · 825072d3c9667feb

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 4911938366775d89910d5107b0374c9b SHA-1: 3ff8669eba1572ff89a823802db2f3a71b9c5e83 SHA-256: 825072d3c9667febb33cf9e03b42936a5da544380ff93da32c347d913e245ddf

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that uses CreateObject to execute a batch file and a VBScript. The batch file contains obfuscated PowerShell commands that attempt to download and execute a second-stage payload from multiple URLs. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' strongly suggests the Emotet family.

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
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
VBA project inside OOXML medium OOXML_VBA

Document contains a VBA project — 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
`vbaProject_00.bin` `b1efd2170c4a768a4fc404db08fd5fe24c6c9e5d090a9633c683c3978ad7fa00`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 bytes

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