Malicious Office (OLE) / .XLA — malware analysis report

Static analysis result for SHA-256 70420cbda655348b…

MALICIOUS

Office (OLE) / .XLA

354.5 KB Created: 2009-01-02 14:14:59 Authoring application: Microsoft Excel
MD5: c38aeabe50c96a485f26f1958225f946 SHA-1: 1496036abfa8a2232e4bcb6875d4e1a3f678c6a0 SHA-256: 70420cbda655348b1c00878ea95654a908b239d461108b42633825cca9aa553f
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel add-in (.XLA) containing an Auto_Open VBA macro, which is a common technique for executing malicious code upon opening. The VBA code is heavily obfuscated and uses CreateObject, indicating it likely attempts to download and execute a secondary payload. The 'Fake invoice / payment lure' heuristic further suggests a phishing or social engineering pretext for execution.

Heuristics 6

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
533d1b04837a954da8f67a3bae8f34d9f0e238c18697aa20a7d03eea7d8f468a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 139352 bytes

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