Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 2b4c8404ac94ed75…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: af012f7d5a50cb112688418cb3b5851e SHA-1: ee06298cb72dd4d1f50c58433f76b33ade242240 SHA-256: 2b4c8404ac94ed75f1d9f87de028abca5acc50cdd1a0638e0efb9c421f0f27bb
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 file is a macro-enabled Excel spreadsheet identified by ClamAV as Emotet. The Workbook_Open macro is configured to execute, and it uses CreateObject to likely download and execute a second-stage payload. The script attempts to reconstruct a URL from concatenated strings, which resolves to 'http://midnighsilverbircrafter.com/store/wBjNOUw/B110N4cQ6R3/' and 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQ6R3/', and also includes 'https://redington.karmat'. It also drops and executes 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'.

Heuristics 6

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
a15ed8dffac850b05955d23d68d427d2c80da848130e5290389569b6ece1bff7		 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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