Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6566f7a379e744ca…

MALICIOUS

Office (OLE)

659.0 KB Created: 2018-07-26 00:26:51 Authoring application: Microsoft Excel
MD5: 2c13b06a4c6d4d880060037edf641ad5 SHA-1: 835dbe95edd096c6800d75054f7e8d62999248fc SHA-256: 6566f7a379e744ca6e006241bdc600bdcd09c17dc48f61f13f9d9b11b86f9483
336 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious Link

The sample is an Excel document containing a fake remittance advice lure. It utilizes an obfuscated VBA macro, triggered by the Workbook_Open event, to execute a payload. The macro constructs a path to a file in the user's profile and uses CreateObject to write content to it, then executes it via mshta.exe. This indicates a downloader or dropper functionality.

Heuristics 10

  • 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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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
c3b11786cb9d09dcdf4af5cd8b2bcae09eb1cfc30ee608eaa86ca98909fa4d1f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1176 bytes

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