Office (OLE) / .XLS malware analysis — malicious · 779fff1ac4d61bb3

MALICIOUS

Office (OLE) / .XLS

192.0 KB Created: 1999-12-24 16:36:33 Authoring application: Microsoft Excel

MD5: 9f9f3218d4f35f46cfc4be14b3b8660a SHA-1: db63d70eacc8b129d6d5db7b0fe4d46017bfa5f0 SHA-256: 779fff1ac4d61bb358ca977ded63ba84048d2fc4a8a369898a41376274f32d3d

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains both XLM and VBA macros, with a high-confidence Workbook_Open macro firing. The VBA macro exhibits string obfuscation and is associated with a suspicious extracted artifact. The embedded URL http://www.24toto.com/66.exe is likely used to download and execute a second-stage payload, which is a common technique for initial access and malware delivery.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.24toto.com/66.exe�

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `1e2146545f848881b6974ace600b15cc6a57bb6c0dbcce63506efaed6758b4fd`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	17500 bytes
`macros.bas` `f378aca45e0775280d9dba7fbe9d6c3f49f113e880e74593618cd750f06daf82`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	27433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 30 Chr/ChrW string-construction calls.

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