Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ec8150096f1983a3…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: f704fe844334a16994e1f4c9fe96d4c1 SHA-1: d1df5bc24da3ed2a1bd5efc7d4b4fe21d98e8a85 SHA-256: ec8150096f1983a368b74ddab6340e821acde26e882fdde0a92c48713f95df19
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The Workbook_Open macro automatically executes a Wscript.Shell object to run a VBScript and a Batch file. The VBScript, 'yhjlswle.vbs', is obfuscated but appears to construct and execute a command line that includes multiple URLs, suggesting it's designed to download further payloads. The Batch file, 'ughldskbhn.bat', is also constructed to execute commands. The ClamAV detection 'Doc.Downloader.EmotetRed02220-9938909-0' strongly indicates Emotet family activity, which commonly uses macro-enabled documents for initial infection and payload distribution.

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.

FilenameKindSourceSize
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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