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

Static analysis result for SHA-256 2a36f4f8d0bd6b9c…

MALICIOUS

Office (OLE) / .DOC

351.5 KB Created: 2018-06-15 08:56:00 Authoring application: Microsoft Office Word First seen: 2023-04-19
MD5: 876305f36263bd3a515da037981f0f36 SHA-1: a1a43980517c3862eeb2c23953031e0be96ebfc3 SHA-256: 2a36f4f8d0bd6b9c48e6d7767ab2408e52a3eac20809e22b42b09130c4d9e662
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The AutoOpen macro executes a PowerShell command that downloads and runs a script from a remote URL. The script is obfuscated using string concatenation, but the reconstructed URL is 'https://bienenstock.eastus.cloudapp.azure.com/beeshell/admin/ui/../ui_plugins/100_iex-generator/beeshell.ps1'. The document body, though heavily corrupted, suggests a lure related to document repair or a new version request.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://www.iec.ch
    • http://schemas.openxmlformats.org/drawingml/2006/main
    • https://bienenstock.eastus.cloudapp.azure.com/beeshell/admin/ui/../ui_plugins/100_iex-generator/beeshell.ps1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
fc7ea0678aeb131ce76d7161261a941c4f479def4d65ce8e8f37d75c29fafc88		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1055 bytes

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