Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a78d7903c69fdc44…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 3a8abd88abb4f0cba5ace8f4955ab0ff SHA-1: dc8faa5779293071dea9fdc0321833e3a9de13ac SHA-256: a78d7903c69fdc44f24fd6764e5eac35e41162c1e540cf572f6c448913bbeab2
240 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetRed02220-9938909-0'. The presence of a Workbook_Open VBA macro that uses CreateObject indicates an attempt to execute code upon opening. The script reconstructs a URL for downloading a second-stage payload: 'http://midnighsilvercraft.com/store/wBjNEnoughw/B1710N4cQA6R3/'. It also attempts to drop and execute a VBS file ('c:\programdata\oue4hjld.vbs') and a BAT file ('c:\programdata\bhnasleil.bat').

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
c1a11f96314ab18d13703b0fe19b5ff335d69431eb8095da11c6facfa84c453e		 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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