Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 493914022b28689a…

MALICIOUS

Office (OOXML) / .XLSX

92.0 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 9ffe620d2b8e7f0156e6d5becc3abd84 SHA-1: 49c978b413f0abfe16b0f4d988e69bfe82519136 SHA-256: 493914022b28689a95accd8446fc4304eae3ceb042cbb9d2eacac1a35c093f02
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file contains a Workbook_Open macro that executes a series of obfuscated commands. These commands reconstruct a URL and download a VBScript file to 'c:\programdata\yhjlswle.vbs' and a batch file to 'c:\programdata\ughldskbhn.bat'. The batch file likely executes the VBScript, which then proceeds to download and execute a second-stage payload from one of the provided URLs. The ClamAV detection name 'Xls.Downloader.EmotetRed02221-9938910-0' strongly suggests the Emotet family.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
  • 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
de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12808 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
a033ee1a73497314918649ce34939e0febfd02eca67b55e3b0ee96bd870d929d		 vba-project OOXML VBA project: xl/vbaProject.bin 37888 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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