Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 5ccaa5c760b24d60…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 272b04896e7dd7a5968d3d83484bc26a SHA-1: 36016681c8d640641d203664e6e4a4b838b7bfd4 SHA-256: 5ccaa5c760b24d60793e900b36ffc5e20b73d73d991d1131771be1b4b8c3b98e
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0'. The Workbook_Open VBA macro is designed to execute Windows commands. Specifically, it constructs and executes a batch command that downloads payloads from multiple URLs, including 'http://youlandada.org/eln-imageges/n8DPZISf/', and saves them as 'tjspowj.vbs' and 'uidpjewl.bat' in the 'c:\programdata\' directory. This behavior is characteristic of Emotet malware, which often acts as a downloader for further malicious payloads.

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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