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

Static analysis result for SHA-256 5aa2dcb4727416fa…

MALICIOUS

Office (OLE) / .XLS

61.4 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: c9fe767b25465743cfc2811e399251db SHA-1: ce2342065c2c446a36bee3cff212850ef945e062 SHA-256: 5aa2dcb4727416fa7c4f3578d71e2229175dad5cd1740520fa76afd45a12e243
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet that uses an "Enable Editing" lure to prompt the user to enable macros. Upon enabling, the Auto_Open macro executes a command to download and execute a payload from the URL http://87.251.86.178/pp/oo.html. This indicates a macro-based downloader attack.

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
c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1374 bytes

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