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

Static analysis result for SHA-256 6bd60cc5f817f821…

MALICIOUS

Office (OLE) / .DOC

144.6 KB Created: 2021-01-05 07:06:00 Authoring application: Microsoft Office Word
MD5: 7fb441c71f203818b95e574637308f6e SHA-1: c4153ef15dce3bcd643d8b5f87450f5124265b62 SHA-256: 6bd60cc5f817f82180d63bce13761d46b7c612d82c9d0aba1db3b71464e5a507
202 Risk Score

Malware Insights

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

The document contains a heavily obfuscated VBA macro that executes upon opening. This macro utilizes `CreateObject` to instantiate `Scripting.FileSystemObject` and writes arbitrary content to two distinct file paths, likely to prepare for or execute a second-stage payload. The obfuscation and the use of `CreateObject` to interact with the file system are strong indicators of malicious intent.

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