Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 df45a2a41dfce939…

MALICIOUS

Office (OLE)

52.5 KB Created: 2018-11-07 06:22:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: fe97e5194ccf7382a57bf86148d838d7 SHA-1: c1fbb6afb31bfc1bcb66168d5c4cdd7165322069 SHA-256: df45a2a41dfce93905dfa93d4cf0e5cea5f2e1341dad1331e2b39d8346004059
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The document contains a heavily obfuscated command that leverages PowerShell to decompress and execute a Base64 encoded payload. This payload is likely a second-stage downloader or malware. The presence of `CMD.EXE /C` and PowerShell execution indicators strongly suggests an attempt to bypass security controls and run arbitrary code.

Heuristics 5

  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 329 bytes
SHA-256: dbc5103210941c3d9e3bc72a3e4fab4e1a2c296e9f6b29ba864216aeaa7ee9d3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wnlNlcVKoXP"
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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