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

Static analysis result for SHA-256 66b27e2b881daa5a…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: faca7b3cf0920977c8652e5a08cd86ff SHA-1: 1df0810db902a802acae425f6429f7efc1e008cd SHA-256: 66b27e2b881daa5a7f5e58fcb9faa0b22999e75f2c86399d8374c5a896aa64fb
242 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros that are configured to automatically execute upon opening, indicated by the 'OLE_XLM_AUTOOPEN' and 'OLE_XLM_DANGEROUS_FN' heuristics. The macros utilize functions like RUN and CALL to execute code, and specifically reference a URL (https://binbios.com/ds/261120.gif) which is likely used to download a secondary payload. The 'SC_STR_SHELLEXEC' heuristic further suggests execution of external commands.

Heuristics 6

  • 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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.
  • 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://binbios.com/ds/261120.gif
    • https://binbios.com/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
db00faaaa5dfbd9a76904fe95aa20bad9a05f6214a6081cc43218c3c9509e31c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6676 bytes

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