Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 ff290be1f1d4f352…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 503dc09a16a01232a9b3bc7915ab0404 SHA-1: 05ef539784dc82da2b44e086d0248cf233c33de9 SHA-256: ff290be1f1d4f3523b0843bf7536c0b4cca83e6ef034ddb4656cc000df188cd2
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 a malicious macro-based document. The embedded VBA script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighitsilverbcrafters.com/store/wBjNOUwc/BI710N4cA6R3/', 'https://redington.karmat', and 'http://temp.com/NAT_E_05_22_2009/BI710N4cA6R3/'. It also writes two files to disk: 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. The presence of Emotet-related indicators in the ClamAV signature strongly suggests this family.

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
633d2fdfe881f1634218ce826dba6b952a40d3d7423791b1852203bba457465a		 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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