Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a35de12077c00f31…

MALICIOUS

Office (OLE)

119.0 KB Created: 2018-05-23 13:30:00 Authoring application: Microsoft Office Word First seen: 2018-11-20
MD5: 60c38364975ed0f7d01c51fa635a3f6c SHA-1: 7d99adc322c33bba57c192adbea9ec4f0b6c1eda SHA-256: a35de12077c00f31e3d72c41b2ddd6688794b6454bbed09077b03383484950e9
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic Autoopen macro (OLE_LEGACY_WORDBASIC_AUTOEXEC) indicates an attempt to automatically execute code when the document is opened. The large slack space in the OLE structure (OLE_SLACK_ANOMALY) is often used to hide malicious content. While the VBA project itself contains no executable statements, the Autoopen marker is a strong indicator of malicious intent, likely to download or execute a secondary payload.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 121,856 bytes but its declared streams total only 35,223 bytes — 86,633 bytes (71%) 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: 1cc574e9a5ab598c39a366cd4cecb54902cb2722f8a4d6c222ff96be0b206128
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "jtaPPmcmFHDN"
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

Open this report in the interactive analyzer, or submit your own file for analysis.