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

Static analysis result for SHA-256 a472e55fbf27eabc…

MALICIOUS

Office (OLE) / .XLS

133.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: cdc6d71742ae12f73d0a93973919f9cc SHA-1: 409ab826a6aee58252612f3830bc7284a9213f9c SHA-256: a472e55fbf27eabc06dba8be04239282cf0767b979bed3b6e2911ef6e7e25aae
320 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command and Shell

The file contains VBA macros that trigger on workbook open. These macros leverage Wscript.Shell and PowerShell to download and execute a second-stage payload. The document body contains a long, obfuscated string that, when decoded, appears to be a list of URLs and a command to download a DLL to 'c:\programdata\rundll3.dll'. This strongly suggests a downloader functionality.

Heuristics 8

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • 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
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
2371f091b169c7918c945b8974b3f60437212f84d1a9d429701826689481f8d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6376 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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