Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 235a78779e144a12…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 6632ece8e1f3d725707b9097de7ed5ff SHA-1: 8e0b055703b05a25c35402c02b59dbc139c355e0 SHA-256: 235a78779e144a12c23c568029fea17f32c0ba6124e57d0f8648900ae6c53920
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 contains a Workbook_Open VBA macro that uses CreateObject to execute a batch file and a VBScript. The VBScript is obfuscated but appears to download a second-stage payload from multiple URLs, including 'http://midnighthilivercrafters.com/store/wBjNOUwc/BI710N4cQ6R3/'. The presence of Emotet-related ClamAV detection and the macro's behavior strongly suggest this is an Emotet downloader.

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
71cc6c2674441ad747dd7ecd4bd794087756af1dcb9f50d5dd03c74e9d2e9408		 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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