Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 59fe50d1a998a04e…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 0a01fa8e77e728bf81494727894d3dd2 SHA-1: 19448d16b4f632c5a09e8bd20b29aa398bbc9079 SHA-256: 59fe50d1a998a04ec4dd716bd58a0423c05172e24f17f3fd7f2e43b24230181a
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 critical ClamAV detection and high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution and CreateObject call, strongly indicate malicious intent. The VBA script within 'macros.bas' is designed to execute a batch file and a VBScript, which in turn appear to download and execute further payloads from the provided URLs. The reconstructed URL 'http://midnighitsilverbcraft.com/store/wBjNOUwc/B710N4cA6R3/' is a key indicator for the download mechanism.

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
ea6c115505121ff4bfd3342d5020fd9ffee8e7f11c7efb489054cabb08495582		 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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