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

Static analysis result for SHA-256 6499e81154bb08f3…

MALICIOUS

Office (OLE) / .XLSX

33.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-08-16
MD5: 40d7c7dfe04afec62912d621675ea1c3 SHA-1: 3e2bed02260873ebaac655fac95254793783a39e SHA-256: 6499e81154bb08f3687529904a6e749a51c6817f06b7d8aec130bed97e60ab6d
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The Workbook_Open macro executes a Shell() call to create and write a batch file named 'Outlook.bat' to the Public user directory. This batch file contains obfuscated commands that likely download and execute a second-stage payload. The use of Environ("Public") indicates an attempt to write to a common, user-accessible directory for persistence or execution.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9aae994c2e1c1317470f797f5379b50ed17f44f406e21538b812f3b5e27660ed		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5486 bytes

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