Office (OLE) / .XLS malware analysis — malicious · b3c3eaca8116f1c0

MALICIOUS

Office (OLE) / .XLS

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

MD5: c981889f6ff93bbdbe49d08aa78ef12c SHA-1: af7e48651f8d9b848901f63fb8c27b9f5c937c19 SHA-256: b3c3eaca8116f1c0c5a1f90623367424ed6172effb3579498605c8a911d93d0d

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 defined name, indicating that macros will execute automatically upon opening. The presence of a 'Macro/content-enable lure' heuristic suggests the document prompts the user to enable macros. The embedded URLs are likely used to download and execute a second-stage payload. The XLM macros themselves were too large to fully analyze, but their presence and auto-execution capability are strong indicators of malicious intent.

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://mayread.com/aXfFF8qdsV/th.html
- https://tpcsv.neosj.why3s.tw/XjHoDakG/th.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `7758cbebef832a37ce0a327fd7d893202195f03ba9b854edef74b19dbb11678f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8349 bytes

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