MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
T1059.001 PowerShell
T1059.003 Windows Command Shell
The sample is an Excel 4.0 macro-enabled spreadsheet that impersonates a document signing service like DocuSign to trick the user into enabling macros. The presence of the 'SC_STR_URLDOWNLOAD' and 'OLE_XLM_AUTOOPEN' heuristics, along with the 'URLDownloadToFileA' API call, indicates that the macro attempts to download a second-stage payload from the URL 'd2zjc3191twk8ym.xyz/index.php'. The extracted 'nkfkdsn.exe' suggests the downloaded payload is an executable.
Heuristics 5
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Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOADReference to URLDownloadToFile API
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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.txta3d3cdb345325c3d4854a528125a7497cbe060388705eec0a3c4c39b53ce0ead |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 1187 bytes |
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