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

Static analysis result for SHA-256 c6001690ad5577f7…

MALICIOUS

Office (OLE) / .DOC

43.0 KB Created: 2014-12-08 20:39:00 Authoring application: Microsoft Office Word First seen: 2022-09-13
MD5: 75868c869c85419b175fa2a990586038 SHA-1: 12f78d85bd0c49c73d3f8b6a597345f363b303f7 SHA-256: c6001690ad5577f7d95446e54fab6674903c041c4a5fbc0d33dc451e95c19893
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains heavily obfuscated VBA macros, including an AutoOpen loader, designed to execute a payload. Critical heuristics indicate an obfuscated auto-exec loader that uses CreateObject and Shell execution sinks. ClamAV also detected it as a downloader. The VBA code appears to be designed to download and execute a second-stage payload.

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.
  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e9c8e33e816b6d52b9c02df286d36655e7d6f2a0fc463fface5da00916b57d47		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11862 bytes

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