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

Static analysis result for SHA-256 ef7d2d906abd5e03…

MALICIOUS

Office (OLE) / .XLS

128.5 KB Created: 2022-10-03 07:13:56 Authoring application: Microsoft Excel First seen: 2022-10-03
MD5: 3e7080a698232bd987d162608611e3e6 SHA-1: eaf00304b49f0a26dbc8bc53890bbe3e3bed3dc7 SHA-256: ef7d2d906abd5e0376f3dccd9cd0bfa6e1e2d8aa08cb86e97ea02d3ab6b9e1f6
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLS file contains VBA macros that are automatically executed upon opening, as indicated by the AutoOpen and Auto_Open functions. The critical heuristic firing for Shell() call in VBA confirms that the macro attempts to execute external commands. The VBA p-code auto-execution with execution tokens further supports this, suggesting the macro is designed to download and execute a secondary payload.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Malware.Valyria-10029786-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-10029786-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_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 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
4a02cb4fb752f024088a45b0b0279767f2e4db4d322745fca5af7958f3302d16		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 26812 bytes

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