Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 1a5395b741b166c0…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 49d7acbc4a29a8d54373246ea39ee155 SHA-1: 65293cd14aa190b987d7e2676aedb090e0f05166 SHA-256: 1a5395b741b166c063d25284184d9bb42cefdbb3151b0befe50cf596d4f54950
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file contains VBA macros that are automatically executed upon opening, indicated by the Workbook_Open and CreateObject firings. The script attempts to download a payload from multiple URLs, including reconstructed URLs like 'http://mytelefoniists.de/wp-content/bL8fXv2wM/'. This behavior is characteristic of Emotet downloaders, which are known to use macro-enabled documents to fetch and execute further malicious stages.

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
d6216b1540c6d866e0cdc66ed3bfa2b79b477655c56d42a698e7b407351a97e3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6560 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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