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

Static analysis result for SHA-256 8e6a8c4838e4016a…

MALICIOUS

Office (OLE) / .XLS

86.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d1c67efbddd6bd534e96ce76b3fc7301 SHA-1: f7314cba017bb265df0038bed720196234a55031 SHA-256: 8e6a8c4838e4016ae3cee90d9a2b76f72e9c88ccdcf82b79f1b63ddb7a260716
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The sample contains an Excel 4.0 macro sheet with an Auto_Open defined name, which is a critical finding. The macro sheet utilizes dangerous formula APIs, specifically the RUN function, indicating an attempt to execute external code. The embedded URL 'http://xlsdskl02touc03jeby.com/index.' and the command 'rundll32 ..\Ihjsazcx.rke' strongly suggest that the macro's purpose is to download and execute a secondary payload. The 'Macro/content-enable lure' heuristic further supports this, as the document likely prompts the user to enable macros to initiate the malicious process.

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
a85eb4de9cfe3fe00bb6b820fec77c1720da7de1fe3c57572458c59bec552071		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2473 bytes

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