Office (OLE) / .XLS malware analysis — malicious · 4cfa464e89206788

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel

MD5: e8b44180febe9d9b5edbc576dab31b5b SHA-1: 8702b66edb28bb0254a0330303c83ffc93adb069 SHA-256: 4cfa464e89206788809d3b3373d0de0495e0615634857d2f27a3e8b85ce401d3

102 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file is an Excel 4.0 spreadsheet containing an Auto_Open macro, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. It also employs a macro-enable lure to encourage execution. The extracted macro code includes calls to `FileDownloadTFile` and `runDll`, suggesting it downloads and executes a second-stage payload from the embedded URLs. The specific family is not identifiable from the provided evidence.

Heuristics 4

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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.
URL https://hermescomm.net/x9NvrhL0/lena.html
- https://asistenciajuridicaintegral.com/6YiCkNix5/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `be629cb484f8d82e38c4234ddbad4f1755e762b9c1c8359642d99f8c77e6e858`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8812 bytes

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