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

Static analysis result for SHA-256 bad667ccb081903c…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4b13f3963fd1e7e7ba296e9cdb26c7b9 SHA-1: b761f7aecd275a6c24610e70d4ea9ff31c3d499d SHA-256: bad667ccb081903c9727817933c89fb328f35379ec8c3d5b7d0cc167468cf3ee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The presence of Excel 4.0 macros, specifically triggering the 'OLE_XLM_AUTOOPEN' and 'OLE_XLM_DANGEROUS_FN' heuristics, indicates malicious intent. The 'SC_STR_SHELLEXEC' firing suggests the execution of external commands. The embedded URLs are likely used to download and execute a second-stage payload, as indicated by the 'Doc.Downloader' ClamAV detection name. The document body text is minimal and does not provide further context.

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://ctxpress.com/ds/261120.gif
    • https://ctxpress.com/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
aa837a287543a9593dc9ad53c5a1043539349d9d7158b9d02f92e2bb7330dc0f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6677 bytes

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