MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. It also includes a lure to enable macros, impersonating a document signing service. The extracted macro code attempts to download a DLL from 'https://jrfastener.com/netmount.dll' and execute it, likely as a second-stage payload. The presence of the Auto_Open macro and the download/execute behavior strongly suggests a malicious downloader.
Heuristics 4
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools 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.
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook 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.
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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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Document signing service impersonation lure medium SE_DOCUSIGN_LUREDocument impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt751914d62dadb431415116208fb3a5d89e8ee73fb8c1250c1defeb5df93dfe91 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 4046 bytes |
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