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

Static analysis result for SHA-256 3c6a3157a927ec9f…

MALICIOUS

Office (OLE) / .XLS

574.0 KB First seen: 2022-12-15
MD5: a2bcda63dae3996e427d6022fa8b0b65 SHA-1: b8f8bc489317473f02e13009f33c63859a27ab34 SHA-256: 3c6a3157a927ec9ff9e37cc9c46040f38dacb80db66250fe8c021a6ae773212e
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1140 Deobfuscate/Decode Files or Information

The critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER and OLE_VBA_SHELL heuristics indicate that this XLS file contains obfuscated VBA macros designed to execute arbitrary code. The Workbook_Open event is triggered upon opening, likely to download and run a secondary payload from the embedded URL. The presence of CreateObject and Shell calls further supports this malicious intent.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • 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.
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.motobit.com/help/scptutl/sa298.htm
    • http://www.w3.org/2001/XMLSchema-instance
    • https://social.msdn.microsoft.com/Forums/en-US/dc106e26-e5a0-4ca4-b4b1-a77a5c0d832a/creating-utf8-file-in-excel-macro?forum=isvvba�
    • https://social.msdn.microsoft.com/Forums/en-US/dc106e26-e5a0-4ca4-b4b1-a77a5c0d832a/creating-utf8-file-in-excel-macro?forum=isvvba

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4c37294dddde8ae675ed1be67ad57467741c6d018ef9cb1269f920a90069906c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 625243 bytes

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