Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bb54dc0cfa4ac775…

MALICIOUS

Office (OLE)

659.0 KB Created: 2018-07-26 00:26:51 Authoring application: Microsoft Excel
MD5: eee3566e437c8b23918daba36b7c5518 SHA-1: 429f4c9802dd9549d4e4167cd51414ff5587822a SHA-256: bb54dc0cfa4ac775461547a04c989435a95653d288ff7f4bf6cd50100d8a0d49
296 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The critical heuristic 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' and the presence of a Workbook_Open macro indicate a malicious Excel file. The macro uses CreateObject to write obfuscated VBA code to a file named 'klLabelPositionCustom.sct' in the 'C:\Users\Public\' directory, and then executes it using mshta. This suggests the file is a downloader for a second-stage payload.

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
17194c82f1a43627d8a5e50ea39fcfa10311aa497e984f534795b39ced1627c3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1207 bytes

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