Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a604e25f99ac6e6a…

MALICIOUS

Office (OLE) / .XLSX

133.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: cc8d597021408ee4d258d8f15a0a760c SHA-1: 0d5948045d04b369e430b571614ee29e6588480b SHA-256: a604e25f99ac6e6ae8e6551d84647b5e80c4e05a24c69c32dd6ac9fe6fcc6c78
320 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic

The file contains a Workbook_Open VBA macro that is triggered automatically when the document is opened. This macro uses CreateObject to instantiate Wscript.Shell and then executes obfuscated PowerShell commands. The PowerShell commands appear to download and execute a second-stage payload from a list of URLs. The ClamAV detection name 'Doc.Downloader.EmotetExcel02226-9938630-0' strongly suggests the Emotet family.

Heuristics 8

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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
2371f091b169c7918c945b8974b3f60437212f84d1a9d429701826689481f8d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6376 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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