Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 45b31013cf2e58fd…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: e65f141c6fe38a21dca289daa88a4244 SHA-1: 68a94f6cf20576a23a5f361834c3c7fa0ecc4444 SHA-256: 45b31013cf2e58fd4b6a1587d5472b86121e349bf7e3fcefda23182d48bb165d
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains a Workbook_Open macro that uses CreateObject to execute a batch file and a VBScript. The macro also attempts to download a payload from multiple URLs, including 'http://sumedahonline.com/wp-content/hyzNXJ30XQFEVBSRH/BSRH'. The ClamAV detection name 'Xls.Downloader.EmotetExcel02223-9938902-0' strongly suggests the Emotet family.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12041 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
d8e684b715a6b1ab49f106f3c2d11a9dd916c3fe27a29947fe05f1881b00f0e4		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 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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