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

Static analysis result for SHA-256 8a6b17c4c5890063…

MALICIOUS

Office (OLE) / .XLSX

61.5 KB Created: 2021-02-02 12:32:34 Authoring application: Microsoft Excel
MD5: 67380796dc6c59c80d0b4ca4c4352dd1 SHA-1: f426885589ed6d01d044dca34f99dee08defff8b SHA-256: 8a6b17c4c5890063906d4ca60724afb520a0536212de6e63fad157f7d7c5aa84
340 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros. The Workbook_Open event is configured to execute a Shell() command via WScript.Shell, indicating it's designed to download and run a second-stage payload. The presence of WScript.Shell and Shell() calls strongly suggests execution of arbitrary code. No specific family could be identified.

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
e15af35483b1ecf99dc6644628d45a6c772cd854932d5df473906812445b1df2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 36398 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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