Office (OLE) / .XLS malware analysis — malicious · c40b22a2dbf62ace

MALICIOUS

Office (OLE) / .XLS

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

MD5: f80a45c585c69dd4eb1805bfe9adab0c SHA-1: 8a09caf101c1d928fbee0b08d519208b91d73dbe SHA-256: c40b22a2dbf62acef49e0526534f7b6772c8c6bacc20dc12c7e4c3b561520f1b

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 document also contains an 'enable macros' lure to bypass security settings. The embedded URLs likely host secondary payloads. The presence of XLM macros and the lure technique suggest a downloader or initial access stage.

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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