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

Static analysis result for SHA-256 783c082a914e4434…

MALICIOUS

Office (OLE) / .XLS

66.0 KB Created: 2003-04-23 08:59:25 Authoring application: Microsoft Excel
MD5: 8f2076f9c436df3cf557b91e503ccaf2 SHA-1: e4bdb09b04be9eb680a03a53293766b680958c24 SHA-256: 783c082a914e443437418f2d36e3956c3422246450a51dfcfc59bd96d01f6390
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Excel file containing a Workbook_Open VBA macro. This macro is obfuscated and uses a Shell() call to download and execute a payload from the URL 'https://futanostra.win/foglio.ful'. The macro's intent is to download and execute a second-stage payload, likely a trojan agent as indicated by ClamAV detection.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • ClamAV: Xls.Trojan.Agent-6424727-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Agent-6424727-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://futanostra.win/foglio.ful

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b73f1b0a91843c49817ee4dd1b88a768f3093d42e6da1e45b99a31436401eaa5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4733 bytes

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