Malicious Office (OLE) / .PPT — malware analysis report

Static analysis result for SHA-256 7989a5d2e9755d11…

MALICIOUS

Office (OLE) / .PPT

100.5 KB Created: 2021-02-27 07:31:42 Authoring application: Microsoft Office PowerPoint
MD5: 595549eb6898057e12f3b800988f2c46 SHA-1: bac3ffefcad06e5cec547c2a52e3565bd8f50fde SHA-256: 7989a5d2e9755d1151264362dd6588dd61c6af6840e30dc3b897f9b6e4a06b40
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains an obfuscated VBA macro that executes the Auto_Close function. This function uses the Shell() command to download and execute a second-stage payload from the reconstructed URL: http://111.111.111.111/12162.0.0.19. The macro also attempts to execute 'ping' and 'winword' commands, likely to establish persistence or further obfuscate its actions.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0d962507e03730f0d1e6e65c03f6781b0a986ec95412fe28598c7add17d1bf90		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13136 bytes

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