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

Static analysis result for SHA-256 5ea6c0e741c01253…

MALICIOUS

Office (OLE) / .DOC

531.4 KB Created: 2018-10-24 03:12:08 Authoring application: Windows Installer XML (3.5.0626.0)
MD5: c88d4eec5f2fadc76656cd491d6aac12 SHA-1: 60873963a10757cd128eb5ee56677b08506aae97 SHA-256: 5ea6c0e741c01253428bc81c993ebd3a38dd0054bd1d2928047469f128e2709b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The OLE document exhibits characteristics of containing appended executable content, indicated by a large slack region and appended payload bytes. The presence of an embedded URL, though benign in this case, suggests a potential lure mechanism. The file's structure and appended payload strongly suggest it is designed to deliver a secondary malicious component.

Heuristics 3

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 544,147 bytes but its declared streams total only 31,321 bytes — 512,826 bytes (94%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • 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://microsoft.com0
    • http://www.microsoft.com/pkiops/crl/MicCodSigPCA2011_2011-07-08.crl0a
    • http://www.microsoft.com/pkiops/certs/MicCodSigPCA2011_2011-07-08.crt0
    • http://go.microsoft.com/fwlink/?LinkID=91955ARPNOREPAIRARPNOMODIFYemptyfalseJoltVersionSOFTWARE\Microsoft\Silverlight[FullVersion
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0
    • http://crl.microsoft.com/pki/crl/products/MicRooCerAut2011_2011_03_22.crl0^
    • http://www.microsoft.com/pki/certs/MicRooCerAut2011_2011_03_22.crt0��
    • http://www.microsoft.com/pkiops/docs/primarycps.htm0@
    • http://go.microsoft.com/fwlink/?LinkID=91955ARPNOREPAIRARPNOMODIFYemptyfalseJoltVersionSOFTWARE

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