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

Static analysis result for SHA-256 7389677e946cac42…

MALICIOUS

Office (OLE) / .XLS

316.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c4356a3b949b77bce8be5ecf2def64db SHA-1: e5de9340e03e98e6e0b8f6630cfd40295a6c9881 SHA-256: 7389677e946cac4226da9b84eca90b94b59d46cf2bf4541ea58d96d39e6669d5
310 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous function APIs. The macro attempts to execute a command involving 'rundll32' and a URL, indicating it's designed to download and run a second-stage payload. The presence of the ClamAV detection 'Doc.Downloader.Docusign0521-9864805-0' further supports its malicious downloader nature.

Heuristics 8

  • 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.
  • URL reconstructed from XLM cell array (1 URL) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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 http://companieshouseonlinedownload.com/ox9.png
    • http://companieshouseonlinedownload.com/ox9.png�

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
5c9d8cdabac252cb54215c21380f860c003584958f3e03bc72c9618819f99c20		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2258 bytes
macros.bas
fd07d96d764ed088e47b14754989da446b97d7ed47168365f260819081c82852		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 303 bytes

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