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

Static analysis result for SHA-256 dc0a6b808c321072…

MALICIOUS

Office (OLE) / .DOC

296.0 KB First seen: 2023-10-26
MD5: 4b29f2dd6fa84308db523f66b556299b SHA-1: 2fb3b719ab335ac17ed37aa5d6399035b3c2bc9d SHA-256: dc0a6b808c3210728d03b77170ce0093d1855a2f92b3920d6416bf7778c9f310
284 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains obfuscated VBA macros, including an AutoOpen subroutine, which is a common technique for malicious documents. The script attempts to decode a string of bytes, which when reconstructed, appears to be a sequence of characters that could form part of a command or payload. The presence of CreateObject and Shell execution heuristics further suggests the macro is designed to download and execute a secondary 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliography
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
94eb7a89673b902c84a8d39eeb542bd167d73385cce6791c578b3e6d2e60562a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 9150 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.