Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 34755e986b6f205f…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 6949070cf4607ff036f4d77806cfe057 SHA-1: 29c423b4552248225b8c8e021c9658214808b3cc SHA-256: 34755e986b6f205fe72ddc3b84c5e7238963282695028c49783ef2362730941e
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic

The sample contains a Workbook_Open VBA macro that utilizes Wscript.Shell to execute commands. The macro is designed to download and run a VBScript (yhjlswle.vbs) and a batch file (ughldskbhn.bat) from the C:\programdata\ directory. The extracted URLs suggest a downloader functionality, consistent with Emotet's typical behavior of fetching and executing further stages of malware. The VBA code explicitly reconstructs the paths for the VBScript and batch file, and the obfuscated string in the DOC BODY section appears to be a list of potential download URLs.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 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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