Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8f4306637d344a06…

MALICIOUS

Office (OLE)

661.0 KB Created: 2018-07-26 00:26:51 Authoring application: Microsoft Excel
MD5: 5356d87ef86953dfd99fd26b28927226 SHA-1: 22747f2e92618dbb0fcbf257b577bf29e382e17c SHA-256: 8f4306637d344a0673f623cf2b7326fd9b064a5b56b2e88ec3796c879274bf1c
296 Risk Score

Malware Insights

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

The Excel file contains a Workbook_Open macro that is obfuscated and uses CreateObject to execute a script. The script appears to write content to a file named '//klPaperEnvelope9.sct' and then executes it using mshta.exe, indicating a downloader or execution stage. The document body contains a fake remittance advice, suggesting a social engineering lure.

Heuristics 9

  • 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.
  • 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
ef0c4b4f58e647a41f06b86a8b6947184b8b2a3151256bae7c80c992e3ca41cb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1199 bytes

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