Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 b6037c1230ab14f0…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 91206edc300ebc48a6c50b0f71b56b78 SHA-1: 3c0f2d245aced647df67dc67a92deb2ad7fbf95a SHA-256: b6037c1230ab14f0f8cd2f046ce88b19d418a0803d0958d7298490f59c0eac4a
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a strong indicator of malicious intent. The script attempts to download and execute files from multiple URLs, including 'http://midnighitsilvercraft.com/store/wBjNOUwc/B110N4cQ6R3/' and 'http://temporal.com/NAT_E_05_22_2009/BI710N4cQ6R3/', and saves them as 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' further supports the Emotet family attribution and its 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
c971017b2027a075056fa42391140fff2266669e67f6210322ae5749479cee49		 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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