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

Static analysis result for SHA-256 b89158490acc9c79…

MALICIOUS

Office (OLE) / .XLS

578.5 KB First seen: 2023-01-10
MD5: 2fb6fc4d72a67e9289bc3e0ae7ec99fb SHA-1: 1295f1d0b1c77c9fea840a47addfa3fd60cd64b0 SHA-256: b89158490acc9c7999c2df324ce3f67dfd78847873d4c95c038d8f75b42d3bae
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 file contains a Workbook_Open macro, a common auto-execution technique. This macro is heavily obfuscated and uses CreateObject and Shell() calls, indicating it's designed to download and execute a secondary payload. The presence of an embedded URL suggests a potential download source for this payload. The obfuscated nature and use of auto-execution point towards a downloader or initial access stage of a malware infection.

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
f7857889d1ab11ff1ffad33b13a4da2bbc9a846253b4311fe2cde98e4df72ae9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 625243 bytes

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