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

Static analysis result for SHA-256 62dd16724874e0b0…

MALICIOUS

Office (OLE) / .DOC

403.0 KB Created: 2020-02-19 08:17:00
MD5: 74572fba26f5e988b297ec5ea5c8ac1c SHA-1: 77eb86ad9ab98e858fd37b5a61041a0d11bf8629 SHA-256: 62dd16724874e0b05257118fb06427a6aeb839602bce52e6a139dc379f538bed
312 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious OLE document containing a heavily obfuscated VBA macro. The macro is designed to execute automatically upon opening the document, likely to download and run a secondary payload. The ClamAV detection name 'Ole2.Dropper.Corona-10006209-0' and the presence of a VBA macro with auto-execution functions strongly indicate a dropper or downloader functionality.

Heuristics 10

  • 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: Ole2.Dropper.Corona-10006209-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Dropper.Corona-10006209-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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)
  • 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
542c0358459f01d48bf03186bd07bc6d9737c8a1091e5240260d3abcaf7ba11b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 108604 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 long base64-like blob(s).

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