Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 848f1a8f6e8f2edf…

MALICIOUS

Office (OLE) / .XLSX

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 5b276779c6c1566485d88fe759196702 SHA-1: ec7e0dfd0b4b5966f7f5c94dae36103d79eba1e3 SHA-256: 848f1a8f6e8f2edfe22cf262d4c0da58f772830ff1781165bd616fa3e4ed5e41
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file contains VBA macros that trigger on workbook open, indicative of malicious intent. The macros utilize `CreateObject` and references to `Wscript.Shell` to download and execute payloads from a list of obfuscated URLs. The ClamAV signature 'Doc.Downloader.EmotetExcel02226-9938630-0' further supports the classification as an Emotet downloader.

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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