Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 eacc936406f20865…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 07db604be275b777b48fadb5f28a4ade SHA-1: 5074cc86843fecee568e2718600c20083540582d SHA-256: eacc936406f2086573d25d061ae48c20af4c1c5046a2e98ae5c00ed74904dc28
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open, and CreateObject indicate a malicious macro-based document. The Workbook_Open macro is designed to execute obfuscated commands that appear to download and execute VBS and BAT files from specified URLs. Specifically, the script attempts to download from 'http://midnighsilverbiracter.com/store/wBqNOUw/B170N4cA6R3/', 'http://tempra.com/NAT_E_05_22_2009/BI710N4cA6R3/', and 'https://redington.karmat', saving them as 'oue4hjld.vbs' and 'bhnasleil.bat' in 'c:\programdata\'. This strongly suggests a downloader functionality.

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
dac23ccfcd1c0b352307650fd3ef1685149821e17d09d5137de20b008eb1fd3c		 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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