Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5250a5cb3d6bb676…

MALICIOUS

Office (OLE)

295.0 KB Created: 2001-04-27 17:00:00 Authoring application: Microsoft Word 8.0
MD5: 1d9b36e48309533e9582d0307c4f844d SHA-1: a9e3bcd1706f232f7387190e330ab3e7abd98dc1 SHA-256: 5250a5cb3d6bb67612d4dbce2fb3a60ae6d40c804f2466c0468ee1dc86a17b0e
260 Risk Score

Malware Insights

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

The file is an OLE document containing VBA macros, specifically a Document_Open macro, which is a common delivery mechanism for malware. The ClamAV detection 'Doc.Trojan.Marker-2' strongly indicates malicious intent. The document body, while appearing to be a scientific paper on titration, is likely a lure to encourage the user to enable macros and execute the embedded malicious code.

Heuristics 6

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • ClamAV: Doc.Trojan.Marker-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 302,080 bytes but its declared streams total only 177,812 bytes — 124,268 bytes (41%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9dddaf62bcb42ed79e38d9705f28f6d85f8ec3974c279cf436fb85ddcc77b974		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4401 bytes
Detection
ClamAV: Doc.Trojan.Marker-2
Obfuscation or payload: unlikely

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