Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 f4582dbd78fc66cc…

MALICIOUS

Office (OLE) / .XLSX

143.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-05-31
MD5: 6a68873f9e473ba86b5aa09065b6c87e SHA-1: 71e73b5bf26da85e7175cc1a271f90d945222117 SHA-256: f4582dbd78fc66cc2df11bd275ecb7ac87c5d0b512061f5fe49f002c40ad3e61
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. The document body and sheet names impersonate DocuSign, a common lure to trick users into enabling macros. The presence of an Auto_Open macro suggests the intent is to download and execute a second-stage payload from the listed URLs.

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
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document 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.

FilenameKindSourceSize
xlm_macros.txt
c06303a4d2d9f3242c9a0e11a903b4059f80ff43a79c026b8de7cea5292556c9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2730 bytes

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