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

Static analysis result for SHA-256 cc850d9ecc010f1a…

MALICIOUS

Office (OLE) / .DOC

69.5 KB Created: 2021-05-19 06:17:00 Authoring application: Microsoft Office Word
MD5: cc10c8cbf26d662a15be8d6e144464cc SHA-1: 5dd70db1b61a0574bec44902115301bdbc4f96c4 SHA-256: cc850d9ecc010f1a9876a54c256fa410b7b4ab20a324a6d34561c8fac6d034aa
362 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.011 System Binary Proxy Execution: Rundll32 T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The sample is a malicious OLE document containing a VBA macro. The macro is triggered by the Document_Open event, displaying a fake success message to the user. It then proceeds to execute suspicious commands, including references to WinExec and certutil, indicating an attempt to download and execute a second-stage payload. The presence of a 'Clipboard command execution lure' heuristic suggests the macro may also instruct the user to interact with the clipboard for execution, further increasing the maliciousness.

Heuristics 10

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to WinExec API high SC_STR_WINEXEC
    Reference to WinExec API
  • Reference to certutil (download/decode) high SC_STR_CERTUTIL
    Reference to certutil (download/decode)
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
77dc0f063b3f3193c92f27256982cbe213851756df44b4a819fc4b8f9bf94a18		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5869 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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