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

Static analysis result for SHA-256 ccac6a6acb12bac6…

MALICIOUS

Office (OLE) / .DOC

69.0 KB Created: 2021-12-19 20:36:00 Authoring application: Microsoft Office Word
MD5: ddce8f154d1d9b9f46544d05807c8fdb SHA-1: 916a36b0bffa682aa9656a764b70a76d4b2ce265 SHA-256: ccac6a6acb12bac68c005edf834739a568027bc02c36a7cc039b8326b9510ec4
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains a VBA macro that is automatically executed upon opening the document. This macro utilizes `CreateObject` to instantiate `WScript.Shell` and then proceeds to construct and save a VBScript file named 'putty.vbs' to the document's directory. The script content, though truncated, indicates it will use 'cmd /c PowerShell' to download and execute further payloads. This chain of execution suggests a downloader or initial access mechanism.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4173a76b3422acb8f105f60662c59234a264d041a0dfc5051ec8f875817d702d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7004 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 98 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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