Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 aecd96482df9180d…

MALICIOUS

Office (OOXML)

442.9 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000
MD5: cf30ee45241c7bdc7f6236921a70b9a0 SHA-1: ed5f7f38de18ccc5176a15b26e939bfab54e547c SHA-256: aecd96482df9180d4a6b27f35c8fb73efaa45d91ee26d7b66155a2d2f4efc368
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File T1566.001 Spearphishing Attachment

The critical heuristic 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' indicates an obfuscated auto-exec VBA loader. The Workbook_Open macro uses CreateObject to execute a script file named 'getOrigin3508.sct' located in the ALLUSERSPROFILE directory, which is likely downloaded and executed via mshta. This pattern suggests a downloader or initial execution stage for a more complex payload.

Heuristics 6

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
563d4b98fdd72f39cee7e652defd5b2df29560255df26c8d0b176d65fb477103		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1131 bytes
vbaProject_00.bin
aaca0396762b92ed09d8ce69c07e3f9e96e793d8434436964238bfafc86e2b7e		 vba-project OOXML VBA project: xl/vbaProject.bin 9216 bytes

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