Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 f609bce76fac37bd…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: bf4d544bac38e1f0463383c1cf28f172 SHA-1: 2a7fd967f39037d5741c33e435921accfff056b0 SHA-256: f609bce76fac37bd64c9a70e428059396ab0bf3f3d87ae059b8aedc4070729c4
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is a macro-enabled Excel document identified by ClamAV as 'Doc.Downloader.EmotetRed02220-9938909-0'. The Workbook_Open macro is configured to execute, and it uses CreateObject to initiate a download and execution process. The embedded script attempts to reconstruct a PowerShell command to download a payload from a series of URLs, including 'http://midnighstilvercrafters.com/store/wBjNOUwc/B110N4cQA6R3/' and 'http://tempra.com/NAT_05_22_2009/BI710N4cQA6R3/', and save it as 'bhnasleil.bat' in 'c:\programdata\'. It also attempts to execute a VBScript from 'c:\programdata\oue4hjld.vbs'.

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
12d471442fc4fac204c24e5730a73fcf1c8b4cdaecc6aab454a784a75e7f9208		 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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