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

Static analysis result for SHA-256 6c2bae1c0108508c…

MALICIOUS

Office (OLE) / .XLS

274.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a439ab5c7f4bdf971dc0a30bcaa232f8 SHA-1: 919061af21b01c1964de874e5ed238e78a94741a SHA-256: 6c2bae1c0108508cadee4fe7177bbf94cc46c842d78c12dd93be5157e0d82fb3
122 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled spreadsheet that contains an Auto_Open macro, indicating it will execute automatically upon opening. It also contains a lure to enable macros and impersonates a document signing service. The embedded URL `https://emploimed.com/netr.dll` is likely used to download and execute a secondary payload.

Heuristics 5

  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://emploimed.com/netr.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
0e5eb114c8fd5abcfe2f4fcc65b4470ea3e595e7167c7bbcfac8278ee143a695
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3709 bytes