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

Static analysis result for SHA-256 0d620f839ef140c8…

MALICIOUS

Office (OLE) / .XLSX

34.5 KB Created: 2020-06-09 09:27:48 Authoring application: Microsoft Excel
MD5: 06aff4e79142de950b9a9610f50f5f2a SHA-1: b6bd27689a6292b4bf24d29eb5ca02b72aa8eb1a SHA-256: 0d620f839ef140c869c985d1f678edd6619f2d058986eceb4b5150ff433c5701
360 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of an obfuscated auto-executing VBA loader within a Workbook_Open macro. This loader utilizes WScript.Shell and CreateObject to execute commands, strongly suggesting it's designed to download and run a second-stage payload. The VBA code itself is heavily obfuscated, making it difficult to determine the exact payload or destination.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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 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
3ad9ef900613c58d2d7c5a559eb58d7008db31a1692ae5b355250898ed5daa8e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3302 bytes

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