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

Static analysis result for SHA-256 1bc1e93ae1947b10…

MALICIOUS

Office (OLE) / .XLSX

373.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13
MD5: e0860953a0f7e6d173e4680c0a76369e SHA-1: 66ab47740604220c18270b0a53ebe5e3ba34066a SHA-256: 1bc1e93ae1947b10622353f50f2e711ef311d7608903e9d443875e428aaf40b2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating an attempt to automatically execute code upon opening. The document body displays a 'Sign' prompt and a URL, suggesting a lure to enable macros for downloading a payload. The presence of an Auto_Open macro and the 'enable lure' heuristic strongly suggest this is a macro-based downloader.

Heuristics 3

  • 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.
  • 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
c2dc2d27a90e87fdcc044c59aed45fe776e1b180d63fa23ffc4ef09a815d1305		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4016 bytes

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