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

Static analysis result for SHA-256 f27545a0362464c7…

MALICIOUS

Office (OLE) / .XLS

245.0 KB Created: 2020-11-20 17:59:00 Authoring application: Microsoft Excel
MD5: 7f6d81d2249824244d62860dae482b12 SHA-1: 0cde613726836131f566f068afc26b693206b625 SHA-256: f27545a0362464c7b4bc51e7c1ceeb2c539b23b4b8cb651d9da727c9ba659722
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like EXEC and RUN. The script reconstructs and executes a PowerShell command to download a file named 'sv.exe' from 'http://bohler-edelstahl-at.com/kg.exe' into the user's AppData directory and then executes it. This indicates a downloader or droppper functionality.

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.
  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f02b4c99ca0c3825fa802c887379dd425251b848147398d8b1887343874dba43		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2144 bytes
macros.bas
fed365d3401536fb63e11d0a36cc7c35338c0a8c74a96fb254c46366ad6287cd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 642 bytes

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