Malicious Office (OLE) / .DOCX — malware analysis report

Static analysis result for SHA-256 636ec4ef104ef952…

MALICIOUS

Office (OLE) / .DOCX

429.5 KB Created: 2020-09-08 12:33:00 Authoring application: Microsoft Office Word
MD5: 7841944805cf6801fce0c947c9dd12b8 SHA-1: ba2e4a4b2bd303db8a5b5ec575ca55ac5396f7b4 SHA-256: 636ec4ef104ef952bcae5fea5af3c1dc62caebfbc30df270c1cd1acfcc2a8ab2
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is a Word document containing VBA macros, including an AutoOpen subroutine. The script utilizes CreateObject to interact with the file system, specifically creating a file at 'C:\ProgramData\LKOJHFTYKDSFFV' and writing repetitive data to it. This behavior is indicative of a downloader or droppper mechanism, aiming to stage further malicious activity.

Heuristics 8

  • ClamAV: Doc.Malware.Sdrop-9756475-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sdrop-9756475-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c3222b9122bb2541df1aee152c7a77a1490567bd2d3f63f6270ba978aa8d1175		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 20385 bytes

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