Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 7380f13ca27d8573…

MALICIOUS

Office (OOXML) / .XLSM

437.4 KB Created: 2021-07-28 10:37:27 UTC Authoring application: Microsoft Excel 12.0000
MD5: a557a2263a63011ec35b33bed9f70ad1 SHA-1: af050dd0c7c7a966fb77bc20a6f09d04648a1be1 SHA-256: 7380f13ca27d8573d19ab6a3d9e6edeba2f96677cb124cd282d1b0c3b1310a8c
208 Risk Score

Malware Insights

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

The sample is an XLSM file containing an obfuscated Workbook_Open VBA macro. This macro constructs a path using environment variables and sheet data, then uses CreateObject to execute a script file named 'getReport57310.sct' via mshta. The script execution is likely to download and run a second-stage 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
f2f602ce8b6c2685d4dfbed7f760e6bba53fcbc163624e72961b7cc0ff1a190a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1085 bytes
vbaProject_00.bin
2ea983caebabb691a214e4779c399ea5335be42a69e88fa93f7dcbf964cbee8b		 vba-project OOXML VBA project: xl/vbaProject.bin 9216 bytes

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