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

Static analysis result for SHA-256 966d62b0fbf67df0…

MALICIOUS

Office (OLE) / .DOC

203.0 KB Created: 2020-05-15 00:06:00 Authoring application: Microsoft Office Word
MD5: 89b0b9b1974866e323fb0ff644b4316f SHA-1: a0f6038de1dd1473e8238c6f6d32e054d8a0f79f SHA-256: 966d62b0fbf67df049609a3f77d519db20c27c79a03d69f66bd6aae3ca675ef0
268 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious OLE document containing VBA macros. Heuristics indicate the use of `certutil` for downloading and decoding, a heap spray pattern, and a `CreateObject` call, all common in macro-based malware delivery. The presence of `macros.bas` and the ClamAV detection further confirm malicious intent. The VBA macros likely download and execute a second-stage payload, as suggested by the `certutil` heuristic and the overall structure.

Heuristics 9

  • ClamAV: Ole2.Macro.Agent-9858864-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Macro.Agent-9858864-1
  • Heap-spray pattern detected high SC_HEAP_SPRAY
    Repeated 0x41 (A) bytes found
  • Reference to certutil (download/decode) high SC_STR_CERTUTIL
    Reference to certutil (download/decode)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • NOP-equivalent sled detected medium SC_NOP_EQUIV_SLED
    Long run of 0x41 bytes
  • 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)
  • 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
b54732cb253e26b038063be05fd5f147593b74859bdd5c380c358f8c23a77902		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2036 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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