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

Static analysis result for SHA-256 0018a5d18456d365…

MALICIOUS

Office (OLE) / .XLS

172.0 KB Created: 2020-06-29 22:29:10 Authoring application: Microsoft Excel
MD5: 2a6b788cb122676d3890312e754bfc90 SHA-1: 5744f5012d120edd79f1bb1ed0272b28712127e4 SHA-256: 0018a5d18456d36582b1020be78a055c9c126a8036c618ea956faf722d995bb2
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a macro-enabled Excel spreadsheet containing an obfuscated VBA loader within the Workbook_Open event. This loader utilizes CreateObject and Shell execution to download and execute a second-stage payload, as indicated by the critical heuristic firings and ClamAV detection. The VBA code is heavily obfuscated, making precise reconstruction of the download URL difficult, but the overall intent is clear.

Heuristics 6

  • 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.
  • ClamAV: Xls.Dropper.Agent-8406166-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8406166-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
0551adf171689390a9caee5cb2ed7c26a4870bb5cfc4a22d915eee47537b0a12		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2090 bytes

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