Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 206baadc401f0bb4…

MALICIOUS

Office (OLE)

131.5 KB Created: 2018-03-13 19:36:00 Authoring application: Microsoft Office Word First seen: 2018-07-04
MD5: 170f5a3947f62108c394ddf369938d4d SHA-1: 90f09c78cdea42c911af3cb9d0a4e9e80cf2362b SHA-256: 206baadc401f0bb4dd56e3071f16d744054d14f112fd02d0d10ce60b05e6c692
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic auto-execution marker (AutoOpen), indicating an attempt to run embedded macro code upon opening. While the VBA project itself appears empty of executable statements, the presence of the AutoOpen marker and a high slack space anomaly suggests potential obfuscation or a legacy exploit vector. The document body is heavily corrupted and unreadable, preventing further analysis of its lure.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 134,656 bytes but its declared streams total only 51,712 bytes — 82,944 bytes (62%) 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) 428 bytes
SHA-256: b403fd1d9c534d3e2cc0575f2676e2ea51ea4dbfc81ae67ed1b0943b682aeb49
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

Attribute VB_Name = "bSjNptUWEWI"

Attribute VB_Name = "ZWTRwYaI"

Attribute VB_Name = "ksUwjamiFn"

Attribute VB_Name = "EXiKWXzJEfDdi"

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