Emotet Office (OLE) / .XLSX malware analysis — malicious · f23fc293f7404b1b

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 2901dd726ac531af084bbecc73f18fee SHA-1: c97247ce27bd8b6b154dc346c97cd0de14560901 SHA-256: f23fc293f7404b1be31d16754dee8cbc126f5df86115d3923f7d4dab7866d968

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The critical ClamAV heuristic and multiple high-severity VBA heuristics, including Workbook_Open auto-execution and CreateObject calls, strongly indicate malicious intent. The VBA script contains obfuscated strings that, when reconstructed, reveal multiple URLs likely used to download and execute a second-stage payload. Specifically, the script attempts to download from 'http://santafetortillal.com/_baks/tUX9/' and other similar URLs, and also references executable files like 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat', suggesting a downloader functionality.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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.
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 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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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