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

Static analysis result for SHA-256 e2c9cad83ff0b129…

MALICIOUS

Office (OLE) / .XLS

322.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f6cb8014d2246ec28abde17ac5c888d3 SHA-1: 0f74a1e1f14212927ec55d72a65cd77ee6282093 SHA-256: e2c9cad83ff0b129eb6ed7061bdc8db6416bd25b350b1c7fb0354fa7bde1472c
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.004 Scripting: PowerShell T1105 Ingress Tool Transfer

The file contains both Excel 4.0 (XLM) and VBA macros. The XLM macros include an Auto_Open entry, indicating automatic execution upon opening. The VBA macro explicitly uses the URLDownloadToFile API to download a file from the reconstructed URL 'http://118travel.net/ds/1512.gif'. This functionality strongly suggests the file acts as a downloader for a second-stage payload.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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.
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9f743851029f852c313abe1ca4ebba5d6e6714b29a0765deef128b49edae33ec		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2036 bytes
macros.bas
c3e1431e32df352cbfd71d661cf806f1ecc4ef35060b941b6bf4577b367215c2		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1766 bytes

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