Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 152f93eefe01c654…

MALICIOUS

Office (OOXML)

440.8 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000
MD5: 55f4eac248d972380b03c5e08038e9c6 SHA-1: 97e08246b2b9bdcbafa7a3a7534bc082b2863d6d SHA-256: 152f93eefe01c654a6794d7ae7e79e6b7ca5437db158003e731f94e4590e7163
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristic 'Obfuscated auto-exec VBA loader' and the high-severity 'Workbook_Open macro' firing indicate that the document contains malicious VBA code designed to execute automatically. The script uses CreateObject to execute a command that appears to download and run a second-stage payload, likely a script file named 'getErrorBars7561.sct' using 'mshta'. The obfuscated nature of the script and the use of Environ() suggest an attempt to evade detection.

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
78938674d5a8f8acb7830d69fdc8a493bb7d1228e6c957ef729b6edfdbffd66f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1147 bytes
vbaProject_00.bin
d8313512f54cf9ff62dda0f9253b456c86c22bcd18af33b1e5494cf4d7f0c3cb		 vba-project OOXML VBA project: xl/vbaProject.bin 9216 bytes

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