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

Static analysis result for SHA-256 d03357b48089a3e5…

MALICIOUS

Office (OLE) / .XLS

127.0 KB Created: 2020-11-20 17:59:00 Authoring application: Microsoft Excel
MD5: 1c457698181ec49e6af8e088578ec4b1 SHA-1: f2bf7f1de77effb75de4bf3f7209d7565bebea21 SHA-256: d03357b48089a3e5f99535f301c2fc492a02625849dc2fb604cde0e808edca99
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 PowerShell T1204.002 Malicious Link or Document: User Execution of Malicious Document

The file contains Excel 4.0 macros, specifically an Auto_Open macro that uses dangerous functions like RUN. The script attempts to construct a command string that includes 'Net.WebClient' and 'Do', indicating an intent to download and execute a payload. The VBA project is present but contains no executable statements, suggesting the primary malicious functionality resides within the XLM macros.

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
16f33ecbf6b9a130abefeb97d09982a4b405645ef7328857b634dad27ae9b6bf		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2432 bytes
macros.bas
fed365d3401536fb63e11d0a36cc7c35338c0a8c74a96fb254c46366ad6287cd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 642 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.