Malicious Office (OOXML) / .DOCM — malware analysis report

Heuristics 11

• Shell() call in VBA critical OLE_VBA_SHELL
  Shell() call in VBA
• Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
  VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
• VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
  VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
• VBA project part renamed to evade filename detection high OOXML_VBA_PROJECT_RENAMED
  The VBA project is bound through the OOXML relationship/content type but its part is not named vbaProject.bin. Legitimate Office producers always emit vbaProject.bin; renaming it hides the macros from path-only scanners (observed in the SVCReady loader).
• 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 project inside OOXML medium OOXML_VBA
  Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: word/vbaProjectSignatureAgile.bin)
• Environ() call (env variable access) low OLE_VBA_ENVIRON
  Environ() call (env variable access)
• VBA project is signed but not by a recognised publisher info VBA_SIGNED_UNTRUSTED
  The VBA project carries a digital signature, but the signer does not chain to a recognised code-signing publisher/CA (self-signed, unknown issuer, or unparseable). A signature alone is not evidence of benignity — malware is routinely self-signed or signed with stolen certificates.
• 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 https://raw.githubusercontent.com/RomanMus-bit/vbssss/main/update3.vbs

  • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
  • http://schemas.microsoft.com/office/drawing/2014/chartex
  • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
  • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
  • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
  • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
  • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
  • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
  • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
  • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
  • http://schemas.openxmlformats.org/markup-compatibility/2006
  • http://schemas.microsoft.com/office/drawing/2016/ink
  • http://schemas.microsoft.com/office/drawing/2017/model3d
  • http://schemas.microsoft.com/office/2019/extlst
  • http://schemas.openxmlformats.org/officeDocument/2006/relationships
  • http://schemas.openxmlformats.org/officeDocument/2006/math
  • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
  • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
  • http://schemas.openxmlformats.org/wordprocessingml/2006/main
  • http://schemas.microsoft.com/office/word/2010/wordml
  • http://schemas.microsoft.com/office/word/2012/wordml
  • http://schemas.microsoft.com/office/word/2018/wordml/cex
  • http://schemas.microsoft.com/office/word/2016/wordml/cid
  • http://schemas.microsoft.com/office/word/2018/wordml
  • http://schemas.microsoft.com/office/word/2023/wordml/word16du
  • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash
  • http://schemas.microsoft.com/office/word/2024/wordml/sdtformatlock
  • http://schemas.microsoft.com/office/word/2015/wordml/symex
  • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
  • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
  • http://schemas.microsoft.com/office/word/2006/wordml
  • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

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