Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d9354ea57bd64cef…

MALICIOUS

Office (OLE)

126.0 KB Created: 2017-12-07 10:10:00 Authoring application: Microsoft Office Word First seen: 2018-02-07
MD5: b48977d759c29892b65e52becfff3174 SHA-1: 507cedff88d49066cf0cc67d8ccc4face0d9e385 SHA-256: d9354ea57bd64cef22fc88d535747dcd7729fc6d8664c367b035d29b59c2fa01
130 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with the signature Img.Dropper.PhishingLure-6443153-0. A legacy WordBasic AutoOpen macro marker was detected, indicating the potential for automatic execution upon opening. The large slack space in the OLE structure is also a suspicious artifact. While no specific URLs or scripts were directly executable, the presence of the AutoOpen marker strongly suggests an intent to download and execute a secondary payload, typical of a phishing lure.

Heuristics 5

  • ClamAV: Img.Dropper.PhishingLure-6443153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Img.Dropper.PhishingLure-6443153-0
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 129,075 bytes but its declared streams total only 24,685 bytes — 104,390 bytes (81%) 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).
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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 In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 286 bytes
SHA-256: 7771bf99b1125ee0f87040a7dc7c1fa89eec2186bbf4ab3e822c8d665693af47
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

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