Emotet Office (OLE) / .XLSX malware analysis — malicious · bb68da6ca6e6ebdc

MALICIOUS

Office (OLE) / .XLSX

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

MD5: c9eb09d351b40a75dd8b7f233d75978c SHA-1: 812b4f166559ebb5a400f857da285603db768be0 SHA-256: bb68da6ca6e6ebdcf0ffb17cf1b40e6f920e4207df007e6a61acd22a32ec9707

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02222-9938901-0'. Static analysis reveals VBA macros, specifically a Workbook_Open auto-execution routine, which is a common Emotet delivery technique. The script attempts to create and execute a batch file ('jledshf.bat') and a VBScript ('tghklsd.vbs') from the 'c:\programdata\' directory. The embedded script also contains a long string that appears to be a list of URLs, likely for downloading additional payloads. The script's obfuscated nature and the presence of multiple download URLs strongly suggest it's a downloader for further malicious activity.

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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