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

Static analysis result for SHA-256 de9d415f8380055c…

MALICIOUS

Office (OLE) / .XLS

222.5 KB Created: 2021-01-15 22:22:16 Authoring application: Microsoft Excel
MD5: 05308f4a7eade713ad7bf35ccbf085a7 SHA-1: b2be8aec9ac3358a4d8d34f2771b74d16de3a910 SHA-256: de9d415f8380055c8fc1a2239b7e1e85f29f0f1ba780c7bb2b9e2921dad93123
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro with an Auto_Open entry that utilizes dangerous functions. The macro script reconstructs a PowerShell command to download and execute a file named 'me.exe' from the URL 'https://cutt.ly/WkhzNqw'. This indicates a downloader attack pattern.

Heuristics 3

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
cad6ba76e96d80948522b5e570f221dbeb66e70ea0d3e2acfbdeab23ae131529		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1371 bytes

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