Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 613991668b55fbcf…

MALICIOUS

Office (OLE) / .DOC

143.2 KB Created: 2021-01-05 07:06:00 Authoring application: Microsoft Office Word
MD5: 42a2d9fd86501e15c871e3068b3b7a3e SHA-1: e46052117a59e5eb43e233eae68926e823695028 SHA-256: 613991668b55fbcfe807e10804fdae1253520e4e9bb7ee7bfcdfba3c777fa1e6
202 Risk Score

Malware Insights

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

The sample contains a heavily obfuscated VBA macro that executes upon opening the document. This macro utilizes CreateObject("Scripting.FileSystemObject") to create files in temporary directories, likely to stage and execute a second-stage payload. The obfuscation and use of auto-executing macros are common tactics for malware delivery.

Heuristics 6

  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d3b097275af7032178b4c001ca8fbb5e7bf0f68c090585141a79334ce9cb0a60		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10798 bytes

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