Emotet Office (OLE) / .XLSX malware analysis — malicious · 6b9f0815715e961e

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: cfab94eee7e47b6365a7897e572f566b SHA-1: ef05799f8d5f95e46b07c5a74eb2b4c9e0d8a1a2 SHA-256: 6b9f0815715e961e46988e49c6b99e094f9416d72353b4b08528d3680b5889e4

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains VBA macros that trigger on workbook open, indicative of malicious intent. The script attempts to download and execute a payload from multiple URLs, including reconstructed URLs like 'http://youlandanda.org/eln-imageges/n8DPZISf/'. The presence of Wscript.Shell and CreateObject calls, along with the ClamAV detection for Emotet, strongly suggests this is a downloader for the Emotet banking trojan.

Heuristics 6

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13985 bytes

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