Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 378de99c4dc65ffd…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 8eb9981cff61b2debb9ed58e00ce1a33 SHA-1: b442a3cfc777d2f6539577cd1330f507f222d798 SHA-256: 378de99c4dc65ffd6fbef0b5caa5e78be7d268c03e8e73671b3f847e4a20fb42
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 critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls indicate malicious intent. The embedded VBA script attempts to download and execute payloads from multiple URLs, including 'http://midnighsilverbcraft.com/store/wBjNOUw/B710N4cQ6R3/' and 'http://temp.com/NAT_05_22_2009/BI710N4cQA6R3/', and saves them as 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. The script also attempts to establish persistence by writing to the registry.

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
bac370e2d357ca5eaa97cc5778f13bbddb82bef4ce6ca0bd7a0ee2a9c320610e		 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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