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

Static analysis result for SHA-256 876692ae15f9f333…

MALICIOUS

Office (OOXML) / .XLSM

331.2 KB Created: 2019-06-17 17:48:55 UTC Authoring application: Microsoft Excel 12.0000
MD5: 725b1026b0aebbd378424aa9cde30b22 SHA-1: b637df8ceab8bca97aee7c40bfe6ce06a3d89c74 SHA-256: 876692ae15f9f333ab388773d219f0b6937d2e24fe96bf834dc681de220dfaa9
168 Risk Score

Malware Insights

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

The file is an XLSM document containing a Workbook_Open macro that uses the Shell() function to execute a script. The script appears to construct a path to a file named 'theMillions.sct' and then executes it using 'mshta'. This indicates a macro-based downloader attempting to execute a second-stage payload.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_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
  • 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
e5bc6aa910d9e874e9b7114e6f570dde733fa913d338b5fb42f48c2d742267fb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1119 bytes
vbaProject_00.bin
e2613559915a1bb2c85b88d2a6e77f6b9dc8625ff5357d8cd06883f368cdb7cb		 vba-project OOXML VBA project: xl/vbaProject.bin 9216 bytes

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