Office (OLE) / .XLS malware analysis — malicious · 1bf050b7e1a5abe4

MALICIOUS

Office (OLE) / .XLS

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

MD5: b30d704f2164801a7782a30be0a25c93 SHA-1: 52287cab717ffb1f56238011d004ce0de4074164 SHA-256: 1bf050b7e1a5abe4464e8d94a53adadf1e10f5e6f855914d7169a8cb4382eba7

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, indicating it will execute automatically when opened. The document body contains embedded URLs and references to functions like 'downloadFile' and 'Registe', suggesting it is designed to download and execute a second-stage payload. The presence of an enable-lure heuristic further supports this, as it instructs the user to enable macros.

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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