Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0f9d723c3023a6af…

MALICIOUS

Office (OLE)

161.5 KB Created: 2021-07-11 18:34:00 Authoring application: Microsoft Office Word
MD5: c7810b25c8edd6269c92af482560e600 SHA-1: a47d04a5d06db333e19fde0d780cd9d12b70dc99 SHA-256: 0f9d723c3023a6af3e5522f63f649c7d6a8cb2727ec092e0b38ee76cd1bbf1c4
272 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a Microsoft Office document containing VBA macros. The macros utilize `CreateObject("Scripting.FileSystemObject")` and `Environ()` to construct a path, specifically `C:\Users\Public\Links\dessert.dat`, and then attempt to delete files matching `C:\Users\Public\Links\*.dat`. This strongly suggests the macro's purpose is to download and execute a second-stage payload, likely from a remote source, and clean up any previous stages.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
385a80550ec401dd82ead55890af0095f29bf1e2912d47f6d93cc70a0836e243		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 79581 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 420 long base64-like blob(s).

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