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

Static analysis result for SHA-256 e8ea54a9efdd60b4…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 3ca93775c972c5d8441497dbf3f6062f SHA-1: 7f19a2fd8c49ae46fa93053878fea76938f9af04 SHA-256: e8ea54a9efdd60b4a2009c204e5681d3b16bb55649754f6a5149ace3a698aa01
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.004 Scripting: PowerShell T1059.001 PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059 Command and Scripting Interpreter

The presence of an Excel 4.0 (XLM) macro sheet with Auto_Open and dangerous functions like RUN indicates the file is designed to execute code upon opening. The heuristic firing for ShellExecute further supports this, suggesting the macro attempts to launch an external process. The embedded URLs are likely used to download and execute a second-stage payload, consistent with a downloader malware.

Heuristics 5

  • 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
  • XLM Auto_Open with dangerous formula APIs high 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.
  • 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

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