Office (OLE) / .XLS malware analysis — malicious · ef0dd6eb0d37bb51

MALICIOUS

Office (OLE) / .XLS

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

MD5: b6362254ea632b961e07238fa885ea20 SHA-1: a77afe5cf0512fd3e92e0b551b590c1703d48356 SHA-256: ef0dd6eb0d37bb5126e6aff3d4ef5dc7d4a8b49cf35b45f71917352fe0074065

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that is triggered when the document is opened. The embedded macros are designed to display a lure to the user, instructing them to enable macros, and then proceed to download and execute a payload from one of the two provided URLs. The XLM macros also contain calls to functions like `CALL` and `RUN` which are indicative of executing downloaded code.

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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