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

Static analysis result for SHA-256 820acc712ea6e23e…

MALICIOUS

Office (OLE) / .DOC

661.0 KB Created: 2020-10-20 10:27:00 Authoring application: Microsoft Office Word
MD5: b371470dc7bd04733cc9d2e84d211fab SHA-1: 556deb86aca1de1e40434ed606b501ae90d1a425 SHA-256: 820acc712ea6e23eefe48aad2d0241140c455a98a47737a033ab3699a26f54be
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for initiating malicious actions upon opening the document. The presence of 'CreateObject' and 'SC_STR_WSCRIPT' heuristics, along with the ClamAV detection 'Doc.Dropper.EmbeddedBase64Exe-9865902-1', strongly suggests that the macro is designed to download and execute a second-stage payload. The embedded URL is likely part of this malicious chain.

Heuristics 9

  • ClamAV: Doc.Dropper.EmbeddedBase64Exe-9865902-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmbeddedBase64Exe-9865902-1
  • Heap-spray pattern detected high SC_HEAP_SPRAY
    Repeated 0x41 (A) bytes found
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • Suspicious extracted artifact high 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.
  • 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://www.freevbcode.com/ShowCode.asp?ID=2873�p�
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a62140e108b481d9b94dc54ad720e1451b916e82e231e7470cf4c9895943cb8f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10694 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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