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

Static analysis result for SHA-256 8489048aac28b748…

MALICIOUS

Office (OLE) / .XLS

78.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: afd804d298d7017937aeae6292b02e04 SHA-1: 45d675b25e75e87ee7d5bc234a2017e387d5115c SHA-256: 8489048aac28b7481d939ef400ef39a8af9a7de2f4c8785ca556e89f0cecbf79
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.005 Visual Basic T1218.011 Rundll32

The sample is an Excel 4.0 macro sheet (XLM) that uses an Auto_Open macro to execute. It impersonates DocuSign to lure the user into enabling macros. The macro attempts to download and execute a payload using rundll32.dll, DllRegisterServer, and RLDownloadToFileA, leveraging several suspicious URLs. The specific family is not identifiable from the provided evidence.

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
8fc8eb4fe0d112b1cb5ac2ce2296b7e1ea4a0d10df9396b6e155f9c8f50eb7a8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2293 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.