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

Static analysis result for SHA-256 d01d29f3d696472f…

MALICIOUS

Office (OLE) / .XLSX

88.0 KB Created: 2021-01-29 09:43:45 Authoring application: Microsoft Excel
MD5: 9cc539691ee4de4d1cfb5bcf26cd3f77 SHA-1: 061fd2633f1bf5b9517cb5833c3d68ed2dc1de6c SHA-256: d01d29f3d696472f20a2094b5aaae7712408ac7c52052d8381d4b7be8561882e
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The presence of a Workbook_Open macro combined with critical heuristic firings for Shell() and WScript.Shell usage strongly indicates that this macro is designed to execute arbitrary commands. The Shell() call, in particular, suggests the intent to launch external processes, likely for downloading and executing a secondary payload. The VBA p-code auto-execution further supports this, as it points to an automated execution of the Shell command upon opening the workbook.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
6d74d0de302addded6af615fd694c53ff7291e998e1f894c18b56e97f0f42d3a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 37775 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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