Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ca95953e8882883…

MALICIOUS

Office (OLE)

660.0 KB Created: 2018-07-26 00:26:51 Authoring application: Microsoft Excel
MD5: 0e5fe8af64b1c5ead75e629b8afd34c0 SHA-1: 3f37deb279e3ad45dd7c5c6a8656bbc07cd8157c SHA-256: 6ca95953e88828830e9cdecb6f56a1139d7678b3d2bf2c2e32c27ee01cece84e
296 Risk Score

Malware Insights

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

The Excel document contains a Workbook_Open macro that is obfuscated and uses CreateObject to execute a command. The macro constructs a file path using Environ() and a hardcoded string, likely for persistence, and then uses mshta.exe to execute a payload from that path. The presence of "Wscript.Shell" and "mshta" heuristics, along with the Workbook_Open auto-execution, strongly suggests a downloader or dropper functionality.

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
7d1695002b7675aa963495b47a947b45b3baed4922adafe1088266bb03cfb7f0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1163 bytes

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