Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 b55ba6b925b62683…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 91c7f9c3050c5e08c8e2309cd5c544c9 SHA-1: 884d9c3cc0e64aa126fa2a93772ddfca9fe3cfb9 SHA-256: b55ba6b925b6268388572b87250b56c6a256b5b2395a1dbd7c535701a7000e18
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 is a macro-enabled Excel document containing a Workbook_Open macro that executes a command to download and run a VBScript payload from a hardcoded URL. The script also attempts to download a BAT file. The ClamAV detection and the presence of auto-executing VBA code strongly suggest Emotet activity. The reconstructed URL for the VBScript download is 'http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/'.

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
27b7b4557a71decb0f12d7f815e8b85b5cce690369c9c54b796ad7c9af1146af		 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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