Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 25620b136fcd1082…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 0f996c919ebd10649c849c5d2938c2dc SHA-1: 28d3745a5913ab19ac07f165688197f25c7139b3 SHA-256: 25620b136fcd1082f2540172298e83cd5fccbb88ece7150dc8c17fdacc637426
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighstilvercrafters.com/store/wBjNOUwc/NAT_E_05_22_2009/BI710N4cQA6R3/' and 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQA6R3/', and saves it as 'oue4hjld.vbs' in the 'C:\programdata\' directory. It also creates a batch file 'bhnasleil.bat' in the same directory. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' further supports the Emotet family attribution.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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.
  • 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
6f37dc91bee3558d0c5cbe30585f36cde99c70f01701f6a2beb84a0be8852bb5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 52433 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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