Office (OLE) / .XLS malware analysis — malicious · b2fdb4b2e4fc4e01

MALICIOUS

Office (OLE) / .XLS

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

MD5: a087e7ba32e58eb9fd7a70e28b95ed21 SHA-1: fd107583bc6b973827d24a839fa3aba0d30f5c7f SHA-256: b2fdb4b2e4fc4e01c236db2f0e41e7a88dd2f4e01bcd1bac6d41f1ffaa47099e

102 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic firing indicates the presence of an Excel 4.0 Auto_Open macro, a common technique for executing malicious code upon opening the workbook. The sample also contains an embedded URL, suggesting it is configured to download a second-stage payload. The presence of a macro-enable lure further supports the 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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