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

Static analysis result for SHA-256 0ba92a2d463d8299…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8d35331512fd33566cabb211775ce87c SHA-1: fd429bdb7c0fcf8abf9910fd6bd654e070117687 SHA-256: 0ba92a2d463d829986917bd3799bb064488a1f162e024eaf78510fda2e6eed6a
240 Risk Score

Malware Insights

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

The sample contains a Workbook_Open VBA macro that leverages CreateObject to execute Windows Script Host. The macro appears to download and execute a VBScript payload from a series of URLs, including 'http://youlanda.org/eln-image/n8DPZISf/'. The presence of the ClamAV detection 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0' further supports its malicious nature as a downloader.

Heuristics 6

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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.
  • 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
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 bytes

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