Office (OLE) / .XLS malware analysis — malicious · f9a06fad4380636e

MALICIOUS

Office (OLE) / .XLS

367.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 1a24f9688f50185f3b62ec01bf4e3c80 SHA-1: 2d6d52e5c9696e5f20cd307d791441605aef3efe SHA-256: f9a06fad4380636e1086cbb4794fb14a4129ebf535f3b890646c245753bccfcd

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 workbook containing an Auto_Open macro, a common technique for executing malicious code upon opening. The presence of an 'enable lure' heuristic indicates the document likely prompts the user to enable macros. The extracted URLs are likely used to download a second-stage payload. The XLM macros are too large to fully analyze for specific actions, but the overall pattern suggests a macro-based downloader.

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://silvertoncc.com/ys1Btp80hx/th.html
- https://christleadersworld.com/1TaIPHnbwbNV/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `740337535414e50f998f7a71055f9de0e2208abc42faca490883ba1d9c48deb1`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8349 bytes

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