Office (OOXML) / .XLSM malware analysis — malicious · 030c496c50e6c810

MALICIOUS

Office (OOXML) / .XLSM

442.7 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: 2d80b51f68084e181fea4a741109903b SHA-1: 8f6ac1303d4b9f54526e3ac01c8bdd6a3a26ec85 SHA-256: 030c496c50e6c8103d0d796a56b09c81e8ec0c53c37aca092237046681263762

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 presence of a Workbook_Open macro indicate malicious intent. The VBA script reconstructs a command to execute mshta with a script file located at '%ALLUSERSPROFILE%\getWK1FMT9932.sct', which is then used to run a second-stage payload. This is a common technique for delivering malware via Office documents.

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.

Filename	Kind	Source	Size
`macros.bas` `cfadcf76484e91973089c8cc5602804e69cab6555a8056064e9eac4a2bf804a8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1218 bytes
`vbaProject_00.bin` `348e5c4109272b003470361725e45d4f9aeeaf292414c445277f6213e888d9df`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 bytes

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