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

Static analysis result for SHA-256 d6262da577d3794f…

MALICIOUS

Office (OLE) / .XLS

168.0 KB Created: 2020-11-20 17:59:00 Authoring application: Microsoft Excel
MD5: 41918a65be73ee1f8f501b4a64b69de8 SHA-1: 6fa45be6d9b98305d2a95e98deb68d0b878a2d7d SHA-256: d6262da577d3794f0d40cafec2a6b5bc073449db778243ab5f08517149f44fc8
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 the EXEC function. This function is used to construct and execute a command that downloads a file named 'py.exe' from the URL 'https://tinyurl.com/y8pbownt' using Net.WebClient. The VBA project does not contain executable statements, but the XLM macro is the primary execution vector. The presence of the Auto_Open macro and the EXEC function strongly suggests a downloader or initial access mechanism.

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
a40827dbec971b1f388943edf2e72970470223d1ba36dbd67b82727abdeae8f0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2208 bytes
macros.bas
fed365d3401536fb63e11d0a36cc7c35338c0a8c74a96fb254c46366ad6287cd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 642 bytes

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