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

Static analysis result for SHA-256 07a719c161abff83…

MALICIOUS

Office (OLE) / .XLS

578.0 KB First seen: 2022-12-29
MD5: f1d742004e568273f3f6ff686a895100 SHA-1: c84f6a44df90b9747a891c6602278a74a5dede0e SHA-256: 07a719c161abff8372ddd631dc2bdaedb5dba6f3ed0398f7c7d9d07edd0de1aa
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains heavily obfuscated VBA macros, including a Workbook_Open auto-execution loader. Critical heuristics indicate the use of Shell() and CreateObject calls, typical for downloading and executing a second-stage payload. The embedded URL, while not directly used in the provided script snippet, is a potential indicator of the download source.

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
075b52cc4d265bd86d826ecbd10a7569f90354da36fa7b0d33e50d0c7ca933bb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 625243 bytes

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