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

Static analysis result for SHA-256 95476e2c6eebe21d…

MALICIOUS

Office (OLE) / .XLS

62.5 KB Created: 2020-10-25 18:24:14 Authoring application: Microsoft Excel
MD5: 349bc6f192d790529c0a64c9537644fd SHA-1: a770f148cd022d1dc9c9740a41ab9a5f9530d7ef SHA-256: 95476e2c6eebe21d0329dbf52e6c4f423442cb3da0cede1c74208040f9365e42
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1218 System Binary Proxy Execution

The file is a malicious Excel 4.0 macro-enabled spreadsheet. The presence of XLM Auto_Open with dangerous formula APIs, specifically the RUN function, indicates an attempt to execute arbitrary commands. The heuristic 'SE_LOLBIN_RUN_COMMAND' further confirms the execution of Windows script/execution tools. While an embedded URL was found, it was confirmed as benign, suggesting it might be a decoy or a previously cleaned indicator. The macro's primary function appears to be executing a command, likely to download and run a second-stage payload.

Heuristics 4

  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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://cutt.ly/egD2WM2

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
4c7ee8a81779aa9cac9db24d7772ba6a3a97121b9e989c6cd0bb11ff7c8e40e5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1111 bytes

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