Malicious Office (OOXML) — malware analysis report

Heuristics 14

• ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
• VBA project inside OOXML medium 8 related findings OOXML_VBA
  Document contains a VBA project — VBA macros present
• Potential Shell call in VBA critical OLE_VBA_SHELL
  Potential Shell call in VBA
  Matched line in script

       retVal = Shell(ASKJD, 0)

• 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.
  Matched line in script

      Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & ".\root\cimv2")

• GetObject call high OLE_VBA_GETOBJ
  GetObject call
  Matched line in script

      Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & ".\root\cimv2")

• 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.
• AutoOpen macro low OLE_VBA_AUTOOPEN
  AutoOpen macro
  Matched line in script

  Sub AutoOpen()

• Workbook_Open macro low OLE_VBA_WBOPEN
  Workbook_Open macro
  Matched line in script

  Sub Workbook_Open()

• Auto_Open macro low OLE_VBA_AUTO
  Auto_Open macro
  Matched line in script

  Sub Auto_Open()

• Environ() call (env variable access) low OLE_VBA_ENVIRON
  Environ() call (env variable access)
  Matched line in script

       USER = Environ("username")

• Macro/content-enable lure medium SE_ENABLE_LURE
  Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
• Urgency / deadline lure low SE_URGENCY_LURE
  Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
• Fake invoice / payment lure low SE_INVOICE_LURE
  Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
• 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/markup-compatibility/2006 In document text (OOXML body / shared strings)

  • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
  • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
  • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)

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