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

Static analysis result for SHA-256 1122051d0f736d51…

MALICIOUS

Office (OLE) / .DOC

144.2 KB Created: 2021-01-05 07:06:00 Authoring application: Microsoft Office Word
MD5: df5de879b7428bfa87dd4bebb171879e SHA-1: c75afe66f6085770d615f5e12b05c0d513f2cf08 SHA-256: 1122051d0f736d516d5914a10ea5a525fc7e2f6954047a6e0957edf37527daab
202 Risk Score

Malware Insights

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

The document contains an obfuscated VBA macro that executes upon opening. This macro utilizes CreateObject to interact with the file system, creating files in specific directories. The script appears to be a downloader for a second-stage payload, indicated by the file creation and the use of obfuscated strings.

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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