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

Static analysis result for SHA-256 7dacb839aaebd399…

MALICIOUS

Office (OLE) / .XLS

63.3 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 2ee24a93f1b5dfd83289b2721f7a0a0d SHA-1: 8e0858efc6c25624bf222238fc11bc55ed3b170b SHA-256: 7dacb839aaebd399571b719580bbf80651e75209464b8ceec4a6563b964b8f3f
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing an Excel 4.0 macro sheet with an Auto_Open defined name. This macro is configured to execute a command that downloads and runs a second-stage payload from a remote URL. The document also displays a lure to encourage users to enable macros, a common tactic for malware delivery.

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
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
de81f8962b42018d50fc3f858c62f78dac7c27a8d9c6bc0ba2b69c5b8c8e6d84		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1240 bytes
macros.bas
faef16cfc3b69e6dacc60198a7ccc61c4bb61c8632529929cd74db2189ccdc82		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 906 bytes

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