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

Static analysis result for SHA-256 a1ca1741c838d2a0…

MALICIOUS

Office (OLE) / .XLSX

56.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b4d15a0d680794801947a978c5de842a SHA-1: fe9ad51c292857175943da696d5b12e0cfc07c1c SHA-256: a1ca1741c838d2a0d1e853e0bdd0bcdd1b717d6fc17c4eb834cf55cb9001b42a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.004 JScript/VBScript

The sample contains Excel 4.0 macros, including an Auto_Open function that utilizes dangerous API calls such as RUN. The macro sheet also contains a reference to 'designergon.com/adam/eveliasm.php', indicating a likely download and execution of a second-stage payload. The presence of a lure to enable macros further supports this attack pattern.

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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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
7cfd43e0ec96d055c13380d83d02fda9b8d165845e8b927f869ac6eb14841094		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4630 bytes

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