Emotet Office (OLE) / .XLSX malware analysis — malicious · d395437c143ba9e5

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 113c40f7995c82e264668ba924b970fc SHA-1: 406bcb2676d3cc7117b4b05ef62ad33bae30a63b SHA-256: d395437c143ba9e5f222510f67ceb2317a883fdfa6a07aad5f3f57181cc9ae1d

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is detected as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02222-9938901-0', indicating a known Emotet downloader variant. The Workbook_Open macro fires, and the script uses CreateObject to instantiate Wscript.Shell. It then executes a highly obfuscated PowerShell command that reconstructs multiple URLs and attempts to download and execute a second-stage payload. The reconstructed PowerShell command includes the following URLs: 'http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/', 'http://divachintexiles.com/wp-includes/WWHWRs8KvNzFm6/', 'http://hollandamalabo.com/1520/bUdhEPdf/', and 'http://shwenantawin.com/copma/XTnZii02'. The script also writes a batch file to 'c:\programdata\jledshf.bat' and a VBScript to 'c:\programdata\tghklsd.vbs'.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
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` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12041 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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