Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a0a9caf85ad4d20a…

MALICIOUS

Office (OLE)

52.5 KB Created: 2018-11-07 16:48:00 Authoring application: Microsoft Office Word First seen: 2019-09-30
MD5: 95dfbda2529d75954bd145770f05da71 SHA-1: affa7d1eac4f6e84d110a23ae15658d91119ff36 SHA-256: a0a9caf85ad4d20a89a5d3a607b1124221d4c7128db351e28a7915d8ea618818
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell

The document contains a PowerShell command that is designed to decompress and execute a Base64 encoded payload. The command uses `CMD /c` to launch PowerShell, which then proceeds to decompress the data and execute it. The VBA macros were stripped, but the presence of the PowerShell command and the `SE_LOLBIN_RUN_COMMAND` heuristic indicate a malicious intent to download and execute a secondary payload.

Heuristics 4

  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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) 332 bytes
SHA-256: de92458e56059d66e8bde53340e4cca74be34212d263b1be5c20224b420e45a4
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "vWJbnfiPYXwHzz"
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
'Macro code was removed by Symantec Disarm

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