Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 8ed9d66865242b83…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: a8c598ee8a6745730eccf2eabc8ff2e6 SHA-1: adfbcb0cb807badb90c2abd9c252cfbbffe83eb2 SHA-256: 8ed9d66865242b8394d46d260c628292a317f617f1278c4488b7bc059225ae78
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls strongly indicate a malicious document. The Workbook_Open macro is designed to execute obfuscated commands that download and save two files: 'oue4hjld.vbs' and 'bhnasleil.bat' to the 'c:\programdata' directory. The script then attempts to execute these downloaded files, likely to download and run a second-stage payload. The reconstructed URL 'http://midnighitsilverb.craft.com/store/wBjNOUwc/B710N4cA6R3/' is a key indicator for the download source.

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
4588e408dc7ce8590239851b5e7fc541e7318819fae7389acf1a7af936512cea		 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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