Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 c4f738fe2bf1f5e4…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 1f10530ded1b486960d01c04d450a962 SHA-1: e66e4caef4fd980330dcadf748945103bd64f69d SHA-256: c4f738fe2bf1f5e48db1f46fcd49da37726462b631cd32b57abe605a0f7ab373
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 a Workbook_Open VBA macro that is configured to execute automatically. This macro utilizes CreateObject to initiate a command shell, which then attempts to download and execute a VBScript payload from a hardcoded URL. The extracted URL 'http://midnighitsilverbcafters.com/store/wBjNOUwc/B110N4cQ6R3/' is highly suspicious and indicative of a downloader. The presence of Emotet-related heuristics further supports this classification.

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
2daccc95bbe43191ce7d6ea39ebe5040f31ecbf184a869f5e0d4181679dc3add		 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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