Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 63ec2a80765669b5…

MALICIOUS

Office (OLE)

659.5 KB Created: 2018-07-26 00:26:51 Authoring application: Microsoft Excel
MD5: d620e11fcd186b1e9e8c921cee692289 SHA-1: 5143420522aded1c16acb1abcc2e0ac070e8c316 SHA-256: 63ec2a80765669b56d7d440ccf344be2aaac3f25badfe61f62cb660170f2f3a0
256 Risk Score

Malware Insights

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

The file is an Excel document containing a Workbook_Open VBA macro. This macro is obfuscated and uses CreateObject to write a file to disk and then execute it using Wscript.Shell. The constructed file path is HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy, indicating an attempt to establish persistence. The document body is a fake remittance advice, likely a lure to encourage the user to open the malicious macro.

Heuristics 8

  • 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
  • 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
fe3e3e6d1e4cc38511ebb0cb5ab181a72c26f2eafc3faddc2a7b50c867020ab7		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1156 bytes

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