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

Static analysis result for SHA-256 3447714e85b3e5be…

MALICIOUS

Office (OLE) / .XLS

143.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 85745ffecf8c16d09ec1f71937b00e0e SHA-1: a4fb3022c299000e723601f6aa962f400591f582 SHA-256: 3447714e85b3e5be2e6761453c6b47e8c678a85f58ccfe40e8aad0c9fac080f0
120 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 Auto_Open macro to execute. It impersonates DocuSign to lure the user into enabling macros. The extracted URLs are likely part of the payload delivery mechanism.

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
1408a245e0c7b805b6a3dfa7ec375f3053ae36cd581a6b1e660ec196de7a9f6e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2730 bytes

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