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

Static analysis result for SHA-256 10d10188114d3e2e…

MALICIOUS

Office (OLE) / .DOC

84.1 KB Created: 2021-01-04 16:48:00 Authoring application: Microsoft Office Word
MD5: ccb167d78b34c830de7173a43d6d3fd0 SHA-1: 92abfb88cd937239a60e30f4f77386cd666a1eb7 SHA-256: 10d10188114d3e2e6da08d216530ca52448cc1f2e13fbf31554dba160d51a4b2
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer T1036 Masquerading

The sample contains a Document_Open VBA macro that executes obfuscated code. This code uses CreateObject to instantiate 'Scripting.FileSystemObject' and attempts to create multiple files on the filesystem, such as 'X:\LmwjH\nWkpD.VDluJ'. The obfuscation and file creation indicate a downloader or droppper functionality.

Heuristics 6

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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
5413d2ebbaf274555cb07937d347084313a81ca863adee8961dbe3c4d35cf167		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7277 bytes

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