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

Static analysis result for SHA-256 62fc3b2dbc019ebc…

MALICIOUS

Office (OLE) / .XLS

388.0 KB Created: 2009-07-09 12:06:58 Authoring application: Microsoft Excel
MD5: c9091fa99fd25d2206be7f0758b541b1 SHA-1: df996ebfdaedb7307d8d466f50481522f2e3d497 SHA-256: 62fc3b2dbc019ebc610380ec8d71550e00b67b41005e719bcba979392074c316
440 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell

The sample is a malicious Excel file containing obfuscated VBA macros. The Workbook_Open macro is triggered upon opening, which then uses CreateObject and Shell() calls to execute cmd.exe and potentially WScript.Shell. This indicates an attempt to download and execute a second-stage payload, likely exploiting CVE-2012-0158.

Heuristics 10

  • MSCOMCTL.ListView — CVE-2012-0158 high CVE likely CVE_2012_0158
    MSCOMCTL.ListView — CVE-2012-0158
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e73b977cc080dc6fea13dffec19e2c055133098c9867aee2da28f88c391612e0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 145212 bytes

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