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

Static analysis result for SHA-256 4ad848d8e8e3254f…

MALICIOUS

Office (OLE) / .XLS

1.45 MB Created: 2021-07-29 19:03:34 Authoring application: Microsoft Excel First seen: 2022-02-16
MD5: 76404f918cef2e990cb2088fe818b267 SHA-1: 75c7d272ccbdbe1c485c35ba74d62ee96e6b8525 SHA-256: 4ad848d8e8e3254fd8cab664e793be3406470342a0803ac90221418669625c46
122 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that likely executes PowerShell commands. The document body prompts the user to enable macros, suggesting a social engineering lure. The embedded URL is likely used to download a second-stage payload.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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 https://arturkarolczakshiola.com/zasa/fYiA22eXpUTT7uP.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
cb322c865fb7981c2b6fc2dcd75b3510d98aabf0c3ac84530621884d7cfa272e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1032 bytes

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