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

Static analysis result for SHA-256 2ccc2d25b2b35ab2…

MALICIOUS

Office (OLE) / .XLS

62.5 KB Created: 2020-10-25 18:24:14 Authoring application: Microsoft Excel
MD5: fc02baa98df82e4566aaa51d3cd96aa7 SHA-1: 1e4444b8fa0a795acec48b92a595443168e9f9b2 SHA-256: 2ccc2d25b2b35ab2a8eea3ecb09d07b9b004c00255d43a1c2f1788e1d6b892fa
100 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function, to execute commands. This suggests the macro is designed to download and execute a second-stage payload. The embedded URL, although currently flagged as benign, is a potential indicator of compromise.

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/UgGNvN6

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
a89d5d0eaaadc2615acdfe952493d84718b595c1946fa48c082f12733a2accc9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1111 bytes

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