Office (OLE) / .XLS malware analysis — malicious · 37502fcd0d7174a2

MALICIOUS

Office (OLE) / .XLS

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

MD5: 3c274b2184aa7103bab194988b483d8a SHA-1: eef9396df1d2b589e89f35b5898b30de5470b041 SHA-256: 37502fcd0d7174a2ac2a7e395b54e3911ea64426b769888a935494bc947ebac0

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 upon opening. The document body contains embedded URLs and text that appears to be part of a macro, including calls to `File.DownloadFile` and `run.dll32.RegisterServer`. This suggests the macro is designed to download and execute a second-stage payload from one of the provided URLs, and the user is prompted to enable macros to facilitate this.

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://thedeformo.com/zrbLAqMKy21Y/lena.html
- https://faithfulroofingco.com/nmsY1dCNaBRO/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `13ea4a1fd330f9266fa91027043baa61f334e3ac691e10ce14b7c7fee97c551c`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8812 bytes

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