Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6a648b7dd370ced8…

MALICIOUS

Office (OOXML)

8.0 KB
MD5: 489942447cd5df3c05a926dafd8b8a81 SHA-1: 1afa20954d054fc236c5603d88b3d96f60d0135d SHA-256: 6a648b7dd370ced8ef7f8e330aef01f02f4f0000b6ccd90ea7a2de3a100b9d22
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains VBA macros with Auto_open and Auto_close functions. The Auto_open macro uses URLDownloadToFile to download two files: 'msi.ps1' from http://updatewin32.xyz/3.txt and 'ComeCome.vbs' from http://edc.com.ly/index/wp.txt. The Auto_close macro then executes 'ComeCome.vbs' using cmd.exe. This indicates a downloader pattern designed to fetch and execute further malicious content.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://updatewin32.xyz/3.txt
    • http://edc.com.ly/index/wp.txt
    • http://updatewin32.xyz/3.txt�
    • http://edc.com.ly/index/wp.txt�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
04e6486408a2b6ca0d8af998510e0baa8d2e35ccad93df88af41a7ca5534c522		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 679 bytes
vbaProject_00.bin
4314ec158686a22ce7e347b6f2413bd6f5e3cf67c950ddffbdd6bca53fbc145e		 vba-project OOXML VBA project: ppt/vbaProject.bin 17920 bytes

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