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

Static analysis result for SHA-256 13816fca91c0eb67…

MALICIOUS

Office (OLE) / .XLS

367.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2fa49513865e3e40f64ffc9858081d3e SHA-1: 7eef2806d5470086d0936319af6398e65c94eb53 SHA-256: 13816fca91c0eb67a00f2476476dc3b7e6de7c463711e90680484716798ef3e1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic OLE_XLM_AUTOOPEN indicates the presence of an Excel 4.0 macro sheet with an Auto_Open entry, which is designed to execute automatically when the workbook is opened. The SE_ENABLE_LURE heuristic suggests the document prompts the user to enable macros. The extracted URLs are likely used to host the second-stage payload. The macro itself is too truncated to determine its exact functionality, but the presence of Auto_Open and the embedded URLs strongly suggest a downloader.

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
  • 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 https://escolamundoazul.com.br/ntmQmwXnc6KC/ue.html
    • https://laresumeservice.com/wp7rTKrY/ue.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e0f9b32b2cf7d5bbad99732afb6eb8bf95619170305ebee6a87504bc690cca2a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8209 bytes

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