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

Static analysis result for SHA-256 1aa0d91d7f3e9f0e…

MALICIOUS

Office (OLE) / .DOC

147.0 KB Created: 2021-04-26 10:01:00 Authoring application: Microsoft Office Word
MD5: ff460e989e8db2de2f46516364ad8265 SHA-1: bba89567d5f7ca0422c19e87b04b661245a5d1db SHA-256: 1aa0d91d7f3e9f0eab0de23c5a8bd57d4ec6671777c39587cf8d95e74343e7cf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059.001 PowerShell

The sample contains VBA macros that are automatically executed upon opening the document via the Document_Open event. The macros utilize CreateObject to likely download and execute a second-stage payload from the provided URL. The presence of Windows Script Host references further supports the execution of external scripts.

Heuristics 7

  • 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://landing.yetiapp.ec/IDx6/FLP_5012_306_171.ex
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
dfd3f03c06d4c31da3d9ef941b333caa8d6635b84d9ecba44543c7d6d6271885		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 876 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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