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

Static analysis result for SHA-256 7ebecf9b1b29af67…

MALICIOUS

Office (OLE) / .XLS

274.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c9252cba0225f921abbc313bd03eb8c2 SHA-1: 7ca50be43a27c33e1b1f331272325d6034e7ae1f SHA-256: 7ebecf9b1b29af6797d3d67b605fbb5ca6b678034995647352830eaae154032a
120 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that is triggered upon opening the document. The document body and sheet names impersonate DocuSign to trick the user into enabling macros. The XLM macro likely attempts to download and execute a second-stage payload from the URL 'e2d1mq13kczc9pa.xyz/index.php', potentially saving it as 'ncaoj.exe'.

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.
  • 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
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
a24000df6235ed8fae6796cef334d2f9790b392dae7400e9eb50ba37959a11f5		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2004 bytes

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