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

Static analysis result for SHA-256 9de548a4153bd39b…

MALICIOUS

Office (OLE) / .XLS

59.0 KB Created: 2020-04-27 23:19:44 Authoring application: Microsoft Excel
MD5: 7ff5e8326be525bf93961e27138279ac SHA-1: 6b4db3613e41ae664263a0176561a382461c813b SHA-256: 9de548a4153bd39bad2e89391999885631ff981eb5495462f9726cbb455ee466
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. ClamAV detection confirms it as Xls.Dropper.Agent-7729426-0, suggesting a dropper functionality. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) implies immediate execution upon opening. The document body is heavily obfuscated and unreadable, further supporting a malicious intent to hide its payload delivery mechanism.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-7729426-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7729426-0
  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • 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.

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