Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 9d0d30769cf78fe1…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: ef73fd3afecf512ddcf2b764fb298860 SHA-1: 6f4d371417cd5c2f2e5f6bd2c87b3d73445d697b SHA-256: 9d0d30769cf78fe1331bc1ff166494e59832b7ff4757c3cd97c22849fe967269
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file detected as malicious by ClamAV, specifically identified as an Emotet downloader. The Workbook_Open macro is present and uses CreateObject to execute a command. The VBA script reconstructs and executes a command that downloads and saves two files, 'oue4hjld.vbs' and 'bhnasleil.bat', to the 'c:\programdata\' directory. It then executes the .bat file, which in turn executes the .vbs file. The script also contains multiple URLs that are likely sources for the malicious payload.

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
848c00331ea4d68e716d257b5484782b7961bf07bd15ce6b4934c160979edcc9		 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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